OCCUPANT DETECTION(DIAGNOSTICS) > Check List for Interview
CHECK
Inspect the following items regarding the vehicle’s state.
Occupant Detection Check List for Interview Date of Vehicle Bring-in Year Month Day
Customer’s name
Registration No.
Initial year of registration
Year Month Date
Vehicle model
Frame number
Interviewer
Inspector
Engine type
Odometer reading
Customer specified content
•
•
•
Date and time when the trouble occurred
Year Month Date
Condition of trouble occurrence
(How the trouble occurs)
Weather
Fine Cloudy Rainy Snowy Others ( )
Temperature
°C (°F) — °C (°F)
Vehicle status
Starting
Idling
Driving
Constant speed km/h (MPH)
Acceleration km/h (MPH) — km/h (MPH)
Deceleration km/h (MPH) — km/h (MPH)
Turning km/h (MPH)
Other:
Road conditions
Local street
Highway
Major arterial road
Limited highway
Other:
Road condition
Flat road
Uphill
Downhill
Gravel road
Dry
Wet
Covered with fresh snow
Covered with hardened snow
Frozen
Other:
Seat slide position
Seat reclining position
How often
Always
Sometimes
times per day
times per week
times per month
Dirt road (only once in the past)
Generation timing
Example: It occurs about 30 minutes after driving.
Accessory installation condition
Child restraint seat
ISO FIX
Seat belt fixed
Other:
Passenger’s seat cover
Other:
Seat slide operation
Smooth
Dragged
Does not move
Other:
Seat reclining operation
Smooth
Dragged
Does not move
Other:
Situation inside seat back pocket
Heavy object is in
( )
No heavy object is in
Situation around seat
Foreign matter exists
( )
No foreign matter exists
Situation under seat
Foreign matter exists
( )
No foreign matter exists
Airbag warning light status
Normal (After turning the ignition switch to ON, illuminates for approximately 6 seconds and goes off.)
Remains ON
Remains OFF
Passengers airbag ON/OFF indicator status
Normal (After turning the ignition switch to ON, illuminates for 6
seconds then goes off for 2 seconds, and either ON (adult) or OFF
(children/unoccupied) illuminates.)
Both remain ON
Both remain OFF
Diagnostic trouble code
Airbag
No
Yes
( )
Select monitor communication impossible
Occupant Detection
No
Yes
( )
Select monitor communication impossible
Trouble condition
Passenger’s airbag indicator indicates OFF even when an adult occupies the passenger’s seat.
Passenger’s airbag indicator indicates ON even when a child restraint seat is installed on the passenger’s seat.
Other:
Sensor output at empty seat
(Data monitor value)
When measuring sensor output, adjust the seat to the same position as in system adjustment.
Front left
kg (lb)
Front right
kg (lb)
Rear left
kg (lb)
Rear right
kg (lb)
Total load
kg (lb)
Sensor output at loading an inspection weight
(Data monitor value)
When measuring sensor output, adjust the seat to the same position as in system adjustment.
Front left
kg (lb)
Front right
kg (lb)
Rear left
kg (lb)
Rear right
kg (lb)
Total load
kg (lb)
Vehicle bring-in history information
OCCUPANT DETECTION(DIAGNOSTICS) > General Description
The load sensor of the occupant detection system
(passenger seat only) is fixed to the cushion frame assembly. Never
remove the load sensor from the cushion frame assembly.
3.
The cushion pad, cushion cover, occupant
detection control module and seat harness can be replaced as a single
unit. When the cushion frame assembly is replaced, the occupant
detection control module, seat harness and load sensor are assembled.
When replacing the cushion frame assembly, do not touch the load sensor
to avoid electrical damage.
4.
If the seat cushion cover is removed, make sure to replace the hang wire on the seat cushion side with a new wire.
5.
Never connect the battery in reverse polarity. Occupant detection system may be destroyed instantly.
6.
Do not disconnect the battery cables while the
engine is running. A large counter electromotive force will be generated
in the generator, and this voltage may damage electronic parts such as
occupant detection control module.
7.
Before disconnecting the connectors of each
sensor and control module, be sure to turn the ignition switch to OFF
and wait for 60 seconds or more. Occupant detection control module may
be damaged.
8.
Every occupant detection system-related part is a precision part. Do not drop them.
9.
Do not use electrical test equipment on wiring harness and connector circuits of the airbag system.
10.
Be careful not to damage the airbag system wiring harness when servicing the occupant detection system.
Check the main and other fuses, harnesses and connectors. Also check grounding.
OCCUPANT DETECTION(DIAGNOSTICS) > General Description
PREPARATION TOOL
To measure the voltage and resistance of airbag
system and occupant detection system components, be sure to use the
specified test harness.
1. SPECIAL TOOL
Subaru Select Monitor
ILLUSTRATION
TOOL NUMBER
DESCRIPTION
REMARKS
—
SUBARU SELECT MONITOR 4
Used for setting of each function and troubleshooting for electrical system.
For detailed operation procedures, refer to “Help” of application.
TEST HARNESS Y
ILLUSTRATION
TOOL NUMBER
DESCRIPTION
REMARKS
98299AG040
TEST HARNESS Y
Used for troubleshooting seat belt buckle switch.
TEST HARNESS AE
ILLUSTRATION
TOOL NUMBER
DESCRIPTION
REMARKS
98299XA030
TEST HARNESS AE
TEST HARNESS Y adapter harness.
Used for troubleshooting seat belt buckle switch.
TEST HARNESS AB
ILLUSTRATION
TOOL NUMBER
DESCRIPTION
REMARKS
98299XA000
TEST HARNESS AB
Used when measuring voltage and resistance of occupant detection system.
TEST HARNESS BB
ILLUSTRATION
TOOL NUMBER
DESCRIPTION
REMARKS
98299FL020
TEST HARNESS BB
Used when measuring voltage and resistance of occupant detection system.
TEST HARNESS BC
ILLUSTRATION
TOOL NUMBER
DESCRIPTION
REMARKS
98299FL030
TEST HARNESS BC
Used when measuring voltage and resistance of occupant detection system.
Two sets may be required.
TEST HARNESS BD
ILLUSTRATION
TOOL NUMBER
DESCRIPTION
REMARKS
98299XC000
(Newly adopted tool)
TEST HARNESS BD
Used when measuring voltage and resistance of airbag control module.
TEST HARNESS D
ILLUSTRATION
TOOL NUMBER
DESCRIPTION
REMARKS
98299AG060
TEST HARNESS D
Used for troubleshooting seat belt buckle switch.
2. GENERAL TOOL
TOOL NAME
REMARKS
Circuit tester
Used for measuring resistance, voltage and current.
DST-i
Used together with Subaru Select Monitor 4.
Inspection weight
Used for sensitivity inspection after Rezero operation.
Prepare an inspection weight of 30 to 40 kg in total. If it is a weight of which the accuracy has been verified (within ±0.5%), there is no need of measuring the actual value using a digital scale.
The combination of 98399AG000 and 98399AG010 (total weight: 35.812 kg) can be used.
Digital scale
Used only for sensitivity inspection after
Rezero operation, using an inspection weight of which the actual weight
is not verified or unknown.
OCCUPANT DETECTION(DIAGNOSTICS) > General Description
5. CHECK HARNESS IN OCCUPANT DETECTION CONTROL MODULE (OPEN CIRCUIT IN IGNITION POWER SUPPLY).
1.
Turn the ignition switch
to OFF, and wait for 60 seconds or more after disconnecting the ground
terminal from the battery sensor.REPAIR CONTENTS>NOTE > BATTERY
2.
Disconnect the connector (AB61) of occupant detection control module.
6. CHECK HARNESS IN OCCUPANT DETECTION CONTROL MODULE (OPEN CIRCUIT IN IGNITION POWER SUPPLY).
1.
Turn the ignition switch
to OFF, and wait for 60 seconds or more after disconnecting the ground
terminal from the battery sensor.REPAIR CONTENTS>NOTE > BATTERY
2.
Disconnect the connector (AB59) of seat harness.
3.
Connect the connector (1AB) in the test harness AB to the connector (AB53).
Using a tester, measure the voltage between connector (2AB) in test harness AB and chassis ground.
Connector & terminal
(2AB) No. 3 (+) — Chassis ground (−):
Is the voltage 11 V or more?
Replace the seat harness.
Check rear harness, bulkhead wiring harness, instrument panel wiring harness in this order, and replace the faulty harness.
7. CHECK HARNESS IN OCCUPANT DETECTION CONTROL MODULE (SHORT CIRCUIT IN IGNITION POWER SUPPLY).
1.
Turn the ignition switch
to OFF, and wait for 60 seconds or more after disconnecting the ground
terminal from the battery sensor.REPAIR CONTENTS>NOTE > BATTERY
2.
Using a tester, measure the resistance between occupant detection control module connectors.
Connect the terminal in test harness BC to
connector (AB61) terminal, and apply the tester to test harness BC. Two
sets of test harness BC are required.
8. CHECK HARNESS IN OCCUPANT DETECTION CONTROL MODULE (SHORT CIRCUIT IN IGNITION POWER SUPPLY).
1.
Disconnect the connector (AB59) of seat harness.
2.
Connect the connector (1AB) in the test harness AB to the connector (AB53).
3.
Using a tester, measure the resistance between terminals in test harness AB connector (2AB).
Connector & terminal
(2AB) No, 3 — (2AB) No. 1 — 6 (except for No. 3):
Is the resistance 1 MΩ or more?
Replace the seat harness.
Check rear harness, bulkhead wiring harness, instrument panel wiring harness in this order, and replace the faulty harness.
9. CHECK HARNESS IN OCCUPANT DETECTION CONTROL MODULE (OPEN CIRCUIT IN GROUND).
1.
Turn the ignition switch
to OFF, and wait for 60 seconds or more after disconnecting the ground
terminal from the battery sensor.REPAIR CONTENTS>NOTE > BATTERY
2.
Disconnect the connectors (AB6, AB17, AB18) from airbag CM.
3.
Connect the connector (1BD) in the test harness BD to the connectors (AB6, AB17, AB18).
4.
Using a tester, measure the resistance in
harness between occupant detection control module connector and
connector (4BD) in test harness BD.
Connect the terminal in test harness BC to connector (AB61) terminal, and apply the tester to test harness BC.
When performing [Rezero], the operation must be completed thoroughly.
1.
Park empty vehicle on a level surface.
2.
Check that all harness and connectors are connected.
3.
Check the following items to adjust the condition of the vehicle.
Adjust the seat backrest to be fully upright.
(For models with power seats, press the power seat button until the
backrest comes to a stop.)
Adjust the lifter position all the way down.
(For models with power seat, press the power seat button until the seat
does not move any further.) (Model with seat lifter)
Do not place anything on the top of the seat cushion.
Sit on the seat cushion to smooth the seat surface.
Check that the passenger’s seat belt is not inserted into the buckle, not tense or not stuck.
Check that ambient temperature is in a range from 0 — 40°C (32 — 104°F).
4.
Connect the Subaru Select Monitor.
5.
Turn the ignition switch to OFF, then turn it to ON again.
This operation is performed to readjust the standard of occupant detection sensor.
Do not touch the seat until the Rezero is
completed. If you have touched the seat even if only once, perform
operations from the step 3) again.
6.
On [Start] screen, select [Diagnosis].
7.
On [Vehicle selection] screen, input the target vehicle information and select [OK].
8.
On [Main Menu] screen, select [Each System].
9.
On [Select System] screen, select [Occupant Detection].
10.
On [Occupant Detection] screen, select [DTC].
11.
After replacement of passenger’s seat
Check that no DTC other than DTC B178C is displayed in current malfunction. When B178B is recorded, this means that [Rezero]
for passenger’s seat was not performed at seat factory. In this case,
replace the passenger’s seat. When any other DTC is displayed, perform
the diagnosis according to the DTC.
After replacement of the occupant detection control module
Check that no DTC other than DTC B178B and B178C
is displayed in current malfunction. When DTC other than B178B and
B178C is displayed, perform the diagnosis according to the DTC.
When collision detection DTC is recorded
Check that no DTC other than DTC B1783, B1784,
B1785 and B1786 is displayed in current malfunction. Perform the
diagnosis according to the DTC.
12.
On [Occupant Detection] screen, select [Work Support].
13.
On [Work Support] screen, select [Rezero].
14.
After [See service manual. And check vehicle condition for successfully completing.] is displayed on the screen, check the vehicle condition and select [Next].
15.
When [Rezero] is performed after replacing the occupant detection control module and passenger’s seat, [Calibration error has occurred. See service manual.] is displayed on the screen. In this case, check the replacement status described in step 11, and select [Next].
16.
[Rezeroing Adjust the passenger seat to the condition shown in service manual.]
is displayed on the screen. Slide the passenger’s seat all the way to
the front, check that the backrest is adjusted to the most upright
position and the lift position of the model with seat lifter is adjusted
to the downmost position, and select [Next].
17.
When [Rezeroing Unbelt the passenger seatbelt.] is displayed, make sure the passenger’s seatbelt is disconnected from the buckle and select [Next].
18.
When [Rezeroing Confirm ambient temperature Between 0 and 40°C. (32 and 104°F)]
is displayed on the screen, check that ambient temperature at the seat
is in a range from 0 — 40°C (32 — 104°F) and select [Next].
19.
When [Rezeroing Empty the passenger seat. Turn ignition OFF, and within 10 seconds, turn ignition ON again.]
is displayed on the screen, turn the ignition switch to OFF and then ON
again while the passenger’s seat is empty, make sure that airbag OFF
indicator illuminates and airbag ON indicator does not illuminate, and
then select [Next].
After selecting [Next], [In process... Please wait for a while without touching vehicle.] is displayed. Do not touch or rock the vehicle while the message is displayed.
20.
When the sensor rezero adjustment is complete successfully, [Rezeroing is successfully completed. Press "OK" to END.] is displayed. Select [OK].
When [Rezeroing is Unsuccessful.] is displayed during sensor rezero adjustment, select [OK] and perform the process according to the displayed error code. OCCUPANT DETECTION(DIAGNOSTICS)>Rezero>LIST
When [Diagnostic code check. Some troubles occur. See service manual. Press "OK" to END.] is displayed during sensor rezero adjustment, select [OK] and read DTC of [Occupant Detection]. OCCUPANT DETECTION(DIAGNOSTICS)>Diagnostic Trouble Code (DTC)
When DTC is displayed, perform the diagnosis
according to the DTC, and then perform sensor rezero adjustment. When
DTC is not displayed, check the seat and vehicle status and then perform
the sensor rezero adjustment again. OCCUPANT DETECTION(DIAGNOSTICS)>Rezero
21.
[Next, execute sensor sensitivity check.] is displayed on the screen. Select [OK].
22.
After [See service manual. And check vehicle condition for successfully completing.] is displayed on the screen, check the vehicle condition.
23.
After [Sensitivity check Adjust the passenger seat to the condition shown in service manual.]
is displayed on the screen, check that the passenger’s seat does not
change from the state confirmed in step 16), and select [Next].
24.
When [Sensitivity check Unbelt the passenger seatbelt.] is displayed, make sure the passenger’s seatbelt is disconnected from the buckle and select [Next].
25.
When [Sensitivity check Confirm ambient temperature Between 0 and 40°C. (32 and 104° F)]
is displayed on the screen, check that ambient temperature at the seat
is in a range from 0 — 40°C (32 — 104°F) and select [Next].
26.
When [Sensitivity check Empty the passenger seat.] is displayed on the screen, make sure the passenger’s seat is empty and select [Next].
27.
After [According to service manual, prepare the
weight / SST whose mass is prescribed for sensitivity check, or measure
mass of the weight by high-precision electronic scale] is displayed on
the screen, prepare an inspection weight of 30 kg to 40 kg in total, and
check that there is no dirt or foreign matter on it.
If the prepared inspection weight is a weight of which the accuracy has been verified (within ±0.5%), only record the total weight since there is no need of measuring the actual value using a digital scale.
If the weight value of prepared weight is not
verified or the accuracy is unknown, prepare a digital scale and make
sure that there is no dirt or foreign matter on it and that the
indication is 0 g (kg) when the power is turned on. Then measure and
record the total value.
Then select [OK].
If 98399AG000 and 98399AG010 are used together,
also check that there is no dirt, foreign matter or damage on them, but
there is no need of measuring.
28.
When [Input the total mass value of the prepared
weight / SST, or input the measured value of measuring the weight.
(Unit: kg)] is displayed on the screen, input the total mass of weight
recorded in step 27) and select [Enter].
If 98399AG000 and 98399AG010 are used together, input the total specified weight value: 35.812 kg.
29.
After [Prepare•mass value of the measured weight] is displayed on the screen, check the input value and select [OK].
30.
After [Put the prepared weight on the seat according to service manual.] is displayed on the screen, set the inspection weight on the center of passenger’s seat surface, and select [OK].
After selecting [OK], [In process... Please wait for a while without touching vehicle.] is displayed. Do not touch or rock the vehicle while the message is displayed.
31.
When [Sensitivity check is finished. Read Value :
∗∗∗∗ kg The mass of weight: ∗∗∗∗ kg] is displayed on the screen, select
[OK] and turn the ignition switch OFF to exit.
32.
When [Sensitivity check fail. See service manual. Press "OK" to END.]
is displayed during sensor sensitive inspection, select [OK] and
perform the operation from the beginning. If failure, error code is
displayed. Check the error code and fix it. OCCUPANT DETECTION(DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST
OCCUPANT DETECTION(DIAGNOSTICS) > Rezero
LIST
Code
Contents
Causes
Action to take
0020H
Timeout due to unstable load
Occupant detection control module judged the
current situation as error because the over-specified load change
occurred during rezeroing.
Perform rezeroing again at a stable place where vehicle vibration hardly occurs.
0021H
FL sensor upper limit error
Rezeroing cannot be executed because the load value of FL sensor exceeds the upper limit of rezero adjustment range.
Check that the seat is in proper position and
fixed securely, and perform rezeroing again. If the same code appears
again, replace the seat assembly. SEATS>Front Seat
0022H
FL sensor lower limit error
Rezeroing cannot be executed because the load value of FL sensor exceeds the lower limit of rezero adjustment range.
Check that the seat is in proper position and
fixed securely, and perform rezeroing again. If the same code appears
again, replace the seat assembly. SEATS>Front Seat
0023H
FR sensor upper limit error
Rezeroing cannot be executed because the load value of FR sensor exceeds the upper limit of rezero adjustment range.
Check that the seat is in proper position and
fixed securely, and perform rezeroing again. If the same code appears
again, replace the seat assembly. SEATS>Front Seat
0024H
FR sensor lower limit error
Rezeroing cannot be executed because the load value of FR sensor exceeds the lower limit of rezero adjustment range.
Check that the seat is in proper position and
fixed securely, and perform rezeroing again. If the same code appears
again, replace the seat assembly. SEATS>Front Seat
0025H
RL sensor upper limit error
Rezeroing cannot be executed because the load value of RL sensor exceeds the upper limit of rezero adjustment range.
Check that the seat is in proper position and
fixed securely, and perform rezeroing again. If the same code appears
again, replace the seat assembly. SEATS>Front Seat
0026H
RL sensor lower limit error
Rezeroing cannot be executed because the load value of RL sensor exceeds the lower limit of rezero adjustment range.
Check that the seat is in proper position and
fixed securely, and perform rezeroing again. If the same code appears
again, replace the seat assembly. SEATS>Front Seat
0027H
RR sensor upper limit error
Rezeroing cannot be executed because the load value of RR sensor exceeds the upper limit of rezero adjustment range.
Check that the seat is in proper position and
fixed securely, and perform rezeroing again. If the same code appears
again, replace the seat assembly. SEATS>Front Seat
0028H
RR sensor lower limit error
Rezeroing cannot be executed because the load value of RR sensor exceeds the lower limit of rezero adjustment range.
Check that the seat is in proper position and
fixed securely, and perform rezeroing again. If the same code appears
again, replace the seat assembly. SEATS>Front Seat
0029H
Sensor malfunction
Rezeroing cannot be performed due to sensor malfunction during rezeroing.
Turn the ignition switch
to OFF, and wait for 60 seconds or more after disconnecting the ground
terminal from the battery sensor.REPAIR CONTENTS>NOTE > BATTERY
2.
Disconnect the connector (AB61) from occupant detection control module.
3.
Disconnect the connector (AB60) from the passenger’s buckle switch.
4.
Connect the connector (2D) in the test harness D to the connector (AB60).
5.
Using a tester, measure the resistance between occupant detection control module connector and connector (3D) in test harness D.
Connect the terminal in test harness BC to connector (AB61) terminal, and apply the tester to test harness BC.
4. CHECK SEAT HARNESS (SHORTED BETWEEN LINES AND SHORTED TO GROUND).
Using a tester, measure the resistance between
occupant detection control module connector and chassis ground, and
between occupant detection control module connector terminals.
Connect the terminal in test harness BC to
connector (AB61) terminal, and apply the tester to test harness BC. Two
sets of test harness BC are required.
Connector & terminal
(AB61) No. 5 — All terminals other than (AB61) No. 5:
(AB61) No. 9 — All terminals other than (AB61) No. 9:
Turn the ignition switch
to OFF, and wait for 60 seconds or more after disconnecting the ground
terminal from the battery sensor.REPAIR CONTENTS>NOTE > BATTERY
2.
Check for poor contact in occupant detection control module connector and passenger’s buckle switch connector.
Turn the ignition switch
to OFF, and wait for 60 seconds or more after disconnecting the ground
terminal from the battery sensor.REPAIR CONTENTS>NOTE > BATTERY
2.
Disconnect the connector (AB69) from occupant detection control module.
3.
Disconnect connector (AB70) from the load sensor FL.
4.
Using a tester, measure the resistance between occupant detection control module connector and load sensor FL connector.
Connect the terminal in test harness BC to
connector (AB69) and connector (AB70) terminals, and apply the tester to
test harness BC. Two sets of test harness BC are required.
3. CHECK SEAT HARNESS (SHORTED BETWEEN LINES AND SHORTED TO GROUND).
Using a tester, measure the resistance between
occupant detection control module connector and chassis ground, and
between occupant detection control module connector terminals.
Connect the terminal in test harness BC to
connector (AB69) terminal, and apply the tester to test harness BC. Two
sets of test harness BC are required.
Connector & terminal
(AB69) No. 1 — All terminals other than (AB69) No. 1:
(AB69) No. 7 — All terminals other than (AB69) No. 7:
(AB69) No. 11 — All terminals other than (AB69) No. 11:
Turn the ignition switch
to OFF, and wait for 60 seconds or more after disconnecting the ground
terminal from the battery sensor.REPAIR CONTENTS>NOTE > BATTERY
2.
Check for poor contact in occupant detection control module connector and load sensor connector.
3.
Disconnect the test harness BC, and connect all the connectors.
Turn the ignition switch
to OFF, and wait for 60 seconds or more after disconnecting the ground
terminal from the battery sensor.REPAIR CONTENTS>NOTE > BATTERY
2.
Disconnect the connector (AB69) from occupant detection control module.
3.
Disconnect connector (AB72) from the load sensor FR.
4.
Using a tester, measure the resistance between occupant detection control module connector and load sensor FR connector.
Connect the terminal in test harness BC to
connector (AB69) and connector (AB72) terminals, and apply the tester to
test harness BC. Two sets of test harness BC are required.
3. CHECK SEAT HARNESS (SHORTED BETWEEN LINES AND SHORTED TO GROUND).
Using a tester, measure the resistance between
occupant detection control module connector and chassis ground, and
between occupant detection control module connector terminals.
Connect the terminal in test harness BC to
connector (AB69) terminal, and apply the tester to test harness BC. Two
sets of test harness BC are required.
Connector & terminal
(AB69) No. 2 — All terminals other than (AB69) No. 2:
(AB69) No. 8 — All terminals other than (AB69) No. 8:
(AB69) No. 12 — All terminals other than (AB69) No. 12:
Turn the ignition switch
to OFF, and wait for 60 seconds or more after disconnecting the ground
terminal from the battery sensor.REPAIR CONTENTS>NOTE > BATTERY
2.
Check for poor contact in occupant detection control module connector and load sensor connector.
3.
Disconnect the test harness BC, and connect all the connectors.
Turn the ignition switch
to OFF, and wait for 60 seconds or more after disconnecting the ground
terminal from the battery sensor.REPAIR CONTENTS>NOTE > BATTERY
2.
Disconnect the connector (AB69) from occupant detection control module.
3.
Disconnect connector (AB71) from the load sensor RL.
4.
Using a tester, measure the resistance between occupant detection control module connector and load sensor RL connector.
Connect the terminal in test harness BC to
connector (AB69) and connector (AB71) terminals, and apply the tester to
test harness BC. Two sets of test harness BC are required.
3. CHECK SEAT HARNESS (SHORTED BETWEEN LINES AND SHORTED TO GROUND).
Using a tester, measure the resistance between
occupant detection control module connector and chassis ground, and
between occupant detection control module connector terminals.
Connect the terminal in test harness BC to
connector (AB69) terminal, and apply the tester to test harness BC. Two
sets of test harness BC are required.
Connector & terminal
(AB69) No. 3 — All terminals other than (AB69) No. 3:
(AB69) No. 9 — All terminals other than (AB69) No. 9:
(AB69) No. 5 — All terminals other than (AB69) No. 5:
Using a tester, measure the voltage between occupant detection control module connector and chassis ground.
Connect the terminal in test harness BC to
connector (AB69) terminal, and apply the tester to test harness BC. Two
sets of test harness BC are required.
Turn the ignition switch
to OFF, and wait for 60 seconds or more after disconnecting the ground
terminal from the battery sensor.REPAIR CONTENTS>NOTE > BATTERY
2.
Check for poor contact in occupant detection control module connector and load sensor connector.
3.
Disconnect the test harness BC, and connect all the connectors.
Turn the ignition switch
to OFF, and wait for 60 seconds or more after disconnecting the ground
terminal from the battery sensor.REPAIR CONTENTS>NOTE > BATTERY
2.
Disconnect the connector (AB69) from occupant detection control module.
3.
Disconnect connector (AB73) from the load sensor RR.
4.
Using a tester, measure the resistance between occupant detection control module connector and load sensor RR connector.
Connect the terminal in test harness BC to
connector (AB69) and connector (AB73) terminals, and apply the tester to
test harness BC. Two sets of test harness BC are required.
3. CHECK SEAT HARNESS (SHORTED BETWEEN LINES AND SHORTED TO GROUND).
Using a tester, measure the resistance between
occupant detection control module connector and chassis ground, and
between occupant detection control module connector terminals.
Connect the terminal in test harness BC to
connector (AB69) terminal, and apply the tester to test harness BC. Two
sets of test harness BC are required.
Connector & terminal
(AB69) No. 4 — All terminals other than (AB69) No. 4:
(AB69) No. 10 — All terminals other than (AB69) No. 10:
(AB69) No. 6 — All terminals other than (AB69) No. 6:
Turn the ignition switch
to OFF, and wait for 60 seconds or more after disconnecting the ground
terminal from the battery sensor.REPAIR CONTENTS>NOTE > BATTERY
2.
Check for poor contact in occupant detection control module connector and load sensor connector.
3.
Disconnect the test harness BC, and connect all the connectors.
Replace the fuse. If the replaced fuse blows out
easily, repair or replace the short circuit in the harness between
battery and occupant detection control module.
3. CHECK OCCUPANT DETECTION CONTROL MODULE CONNECTOR.
1.
Turn the ignition switch
to OFF, and wait for 60 seconds or more after disconnecting the ground
terminal from the battery sensor.REPAIR CONTENTS>NOTE > BATTERY
2.
Confirm that the connector of the occupant detection control module (AB61) is securely connected.
Is the connector of the occupant detection control module securely connected?
5. CHECK HARNESS (OPEN CIRCUIT BETWEEN BATTERY AND REAR HARNESS).
1.
Turn the ignition switch
to OFF, and wait for 60 seconds or more after disconnecting the ground
terminal from the battery sensor.REPAIR CONTENTS>NOTE > BATTERY
2.
Disconnect the connector (AB59) of seat harness.
3.
Connect the connector (1AB) in the test harness AB to the connector (AB53).
Check rear harness, instrument panel wiring harness, bulkhead wiring harness in this order, and replace the faulty harness.
6. CHECK SEAT HARNESS (OPEN CIRCUIT).
1.
Turn the ignition switch
to OFF, and wait for 60 seconds or more after disconnecting the ground
terminal from the battery sensor.REPAIR CONTENTS>NOTE > BATTERY
2.
Connect the connector (1BB) in the test harness BB to the connector (AB59).
3.
Using a tester, measure the resistance between
occupant detection control module connector and connector (2BB) in test
harness BB.
Connect the terminal in test harness BC to connector (AB61) terminal, and apply the tester to test harness BC.
Using a tester, measure the resistance between
occupant detection control module connector and chassis ground, and
between occupant detection control module connector terminals.
Connect the terminal in test harness BC to
connector (AB61) terminal, and apply the tester to test harness BC. Two
sets of test harness BC are required.
Connector & terminal
(AB61) No. 1 — Chassis ground:
(AB61) No. 1 — All terminals other than (AB61) No. 1:
8. CHECK HARNESS (OPEN CIRCUIT BETWEEN OCCUPANT DETECTION CONTROL MODULE AND GROUND).
1.
Turn the ignition switch
to OFF, and wait for 60 seconds or more after disconnecting the ground
terminal from the battery sensor.REPAIR CONTENTS>NOTE > BATTERY
2.
Connect all the connectors other than (AB61) of occupant detection control module.
3.
Using a tester, measure the resistance between occupant detection control module connector (AB61) and chassis ground.
Connect the terminal in test harness BC to connector (AB61) terminal, and apply the tester to test harness BC.
OCCUPANT DETECTION(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC B178B SEAT FACTORY CALIBRATION UNCOMPLETED
Diagnosis start condition:
When the ignition voltage is 10 V — 16 V
DTC detecting condition:
Sensor rezero adjustment was not performed at seat factory.
This DTC is detected only when replacing the
occupant detection control module. When this DTC is detected at
replacement of passenger’s seat, this means that [Rezeroing]
for the passenger’s seat assembly was not performed at seat factory
before shipping. In this case, replace the passenger’s seat assembly.
Trouble symptom:
Occupant judgment of occupant detection control module stops.
OCCUPANT DETECTION(DIAGNOSTICS)>Check List for Interview
Fine