KEYLESS ENTRY(DIAGNOSTICS)
KLE(diag)
  1. Basic Diagnostic Procedure
  2. Check List for Interview
  3. General Description
  4. Electrical Component Location
  5. Control Module I/O Signal
  6. Inspection Mode
  7. Diagnostic Procedure for Subaru Select Monitor Communication
  8. Data Monitor
  9. Freeze Frame Data
  10. Work Support
  11. Diagnostic Trouble Code (DTC)
  12. Diagnostic Procedure with Diagnostic Trouble Code (DTC)
  13. Diagnostics with Phenomenon
KEYLESS ENTRY(DIAGNOSTICS) > Basic Diagnostic Procedure　
PROCEDURE

1. PERFORM CUSTOMER INTERVIEW.

Ask the customer when and how the trouble occurred using the interview check list. KEYLESS ENTRY(DIAGNOSTICS) >Check List for Interview

Did you interview the customer?

2

Perform the interview, and 2

2. BASIC INSPECTION.

Perform basic inspection. KEYLESS ENTRY(DIAGNOSTICS) >General Description>INSPECTION

Is the check result OK?

3

Repair the faulty part found in basic inspection, and 3

3. CHECK SUBARU SELECT MONITOR COMMUNICATION.
1.

Turn the ignition switch to OFF.

2.

Connect the Subaru Select Monitor to data link connector. COMMON(diag)>Data Link Connector

3.

Turn the ignition switch to ON and run the Subaru Select Monitor.

4.

Select [Keyless Entry].

 

For detailed operation procedures, refer to “Help” of application.

Is communication possible?

4

Check the communication circuit. KEYLESS ENTRY(DIAGNOSTICS) >Diagnostic Procedure for Subaru Select Monitor Communication

4. CHECK DTC.

Read the DTC of [Keyless Entry] using the Subaru Select Monitor. KEYLESS ENTRY(DIAGNOSTICS) >Diagnostic Trouble Code (DTC)

Are any DTCs displayed? (Current malfunction)

Record the DTC, time stamp and freeze frame data, and 5

Keyless entry system is normal.

5. PERFORM DIAGNOSIS.
1.

Perform the diagnosis for the displayed DTCs. KEYLESS ENTRY(DIAGNOSTICS) >Diagnostic Trouble Code (DTC)>LIST

2.

Repair or replace the cause of trouble.

3.

Using the Subaru Select Monitor, perform the clear memory of [Keyless Entry]. COMMON(diag)>Clear memory

4.

Execute the inspection mode. KEYLESS ENTRY(DIAGNOSTICS) >Inspection Mode

5.

Read the DTC of [Keyless Entry] using the Subaru Select Monitor. KEYLESS ENTRY(DIAGNOSTICS) >Diagnostic Trouble Code (DTC)

Are any DTCs displayed? (Current malfunction)

Repeat step 5 until DTC is not shown.

Finish the diagnosis.

KEYLESS ENTRY(DIAGNOSTICS) > Check List for Interview　
CHECK

Inspect the following items regarding the vehicle’s state.

Keyless Entry Check List for Interview Date of Vehicle Bring-in    Year    Month    Date

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

Frequency of trouble occurrence

Always occurs

Sometimes occurs (   times per day,   times per month)

Condition of trouble occurrence

(How the trouble occurs)

Weather

Fine • Cloudy • Rainy • Snowy • Others (       )

Temperature

   °C (°F) —   °C (°F)

Road conditions

Road surface condition

Accessory installation condition

Diagnostic trouble code

Time stamp

Control module item number/Ver.

Condition of trouble occurrence (How the trouble occurs)

Vehicle bring-in history information
KEYLESS ENTRY(DIAGNOSTICS) > General Description　
CAUTION
1. AIRBAG

When removing airbag related parts, refer to Cautions for Airbags. AIRBAG SYSTEM>General Description>CAUTION

2. KEYLESS ENTRY

When removing keyless entry-related components, refer to cautions in the security&lock section. SECURITY AND LOCKS>General Description>CAUTION

KEYLESS ENTRY(DIAGNOSTICS) > General Description　
INSPECTION
1. BASIC INSPECTION

Before performing diagnosis, check the following items which might affect keyless entry related problems.

1.

Check the battery. STARTING/CHARGING SYSTEMS(H4DO)>Battery>INSPECTION

2.

Check the fuse condition. SECURITY AND LOCKS>Relay and Fuse

Make sure that ampere of the fuse is setting value, and it is not blown out.

3.

Check the connecting condition of harness and harness connector.

KEYLESS ENTRY(DIAGNOSTICS) > General Description　
PREPARATION TOOL
1. SPECIAL TOOL

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.
2. GENERAL TOOL

TOOL NAME

REMARKS

Circuit tester

Used for measuring resistance, voltage and current.

DST-i

Used together with Subaru Select Monitor 4.
KEYLESS ENTRY(DIAGNOSTICS) > General Description　
SYSTEM BLOCK DIAGRAM
12 2 1 6 7 +B IGN SL-10326 TPMS & KEYLESS ENTRY CM OR KEYLESS ENTRY CM MAIN CAN (L) BODY INTEGRATED UNIT MAIN CAN (H)
KEYLESS ENTRY(DIAGNOSTICS) > Electrical Component Location　
LOCATION

(1)

Data link connector

(2)

Body integrated unit

(3)

TPMS & keyless entry CM or the keyless entry CM
KEYLESS ENTRY(DIAGNOSTICS) > Control Module I/O Signal　
ELECTRICAL SPECIFICATION
10 12 11 1 2 4 3 6 5 R80 R221 9 8 7 SL-10380 OR TO

Terminal No.

Item

Measuring condition

Standard

(R221) or (R80) No. 1

CAN-L

Digital signal; can not be measured

—

(R221) or (R80) No. 2

CAN-H

Digital signal; can not be measured

—

(R221) or (R80) No. 3

—

—

—

(R221) or (R80) No. 4

—

—

—

(R221) or (R80) No. 5

—

—

—

(R221) No. 6 ←→ Chassis ground

Ignition power supply

When ignition switch is ON

9 — 16 V

(R80) No. 6

—

—

—

(R221) or (R80) No. 7 ←→ Chassis ground

GND

Always

1 Ω or less

(R221) or (R80) No. 8

—

—

—

(R221) or (R80) No. 9

—

—

—

(R221) or (R80) No. 10

—

—

—

(R221) or (R80) No. 11

—

—

—

(R221) or (R80) No. 12 ←→ Chassis ground

Battery power supply

Always

9 — 16 V
KEYLESS ENTRY(DIAGNOSTICS) > Inspection Mode　
PROCEDURE

It is possible to diagnose the DTC by performing the indicated inspection mode. After correcting the DTC, perform a necessary inspection mode and make sure that the function is resumed correctly and the DTC is recorded.

1. INSPECTION MODE 1

DTC

Item

Note

B2771

EEPROM PERFORMANCE

KEYLESS ENTRY(DIAGNOSTICS) >Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2771 EEPROM PERFORMANCE

B2772

CAN COMMUNICATION (AUDIO) STUCK

KEYLESS ENTRY(DIAGNOSTICS) >Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2772 CONTROL MODULE COMMUNICATION STUCK

U0073

CONTROL MODULE COMMUNICATION BUS OFF

KEYLESS ENTRY(DIAGNOSTICS) >Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF

U0140

LOST COMMUNICATION WITH BODY CONTROL MODULE

KEYLESS ENTRY(DIAGNOSTICS) >Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0140 LOST COMMUNICATION WITH BODY CONTROL MODULE

U0155

LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE

KEYLESS ENTRY(DIAGNOSTICS) >Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0155 LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE

U0422

INVALID DATA RECEIVED FROM BODY CONTROL MODULE

KEYLESS ENTRY(DIAGNOSTICS) >Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0422 INVALID DATA RECEIVED FROM BODY CONTROL MODULE

Diagnostic procedure:

1.

Using the Subaru Select Monitor, perform the clear memory of [Keyless Entry]. COMMON(diag)>Clear memory

2.

Using the Subaru Select Monitor, read the DTC of [Keyless Entry] to check that there is no DTC displayed. KEYLESS ENTRY(DIAGNOSTICS) >Diagnostic Trouble Code (DTC)

 

If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis for the displayed DTCs. After solving the DTC, repeat from step 1).

3.

Remove the ignition key from the ignition switch, and insert again.

4.

Turn the ignition switch OFF → ON, and wait for 10 seconds or more.

5.

Using the Subaru Select Monitor, read the DTC of [Keyless Entry] to check that there is no DTC displayed. KEYLESS ENTRY(DIAGNOSTICS) >Diagnostic Trouble Code (DTC)

 

If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis for the displayed DTCs.

KEYLESS ENTRY(DIAGNOSTICS) > Diagnostic Procedure for Subaru Select Monitor Communication　
INSPECTION

Detecting condition:

  • Defective harness

  • Power supply circuit malfunction

  • Defective TPMS & keyless entry CM or keyless entry CM

  • Defective CAN communication circuit

  • Defective Subaru Select Monitor

Trouble symptom:

Not communicable with Subaru Select Monitor.

Wiring diagram:

7 6 12 1 2 14 6 FB-46F/B FUSE NO. 19(IG) FB-9F/B FUSE NO. 14(B) MB-17M/B FUSE NO. 11(B) FB-47F/B FUSE NO. 19(IG) *1 *2 *1 *2 : WITHOUT TPMS : KEYLESS ENTRY CM WITH TPMS : TPMS & KEYLESS ENTRY CM : WITHOUT TPMS : R80 WITH TPMS : R221 *3 : WITH TPMS *3 8 30 i284 R466 i288 8 16 REF. TO CAN COMMUNICATION SYSTEM 4 5 REF. TO ENGINE ELECTRICAL SYSTEM DATA LINK CONNECTOR i288 1 9 8 16 2 10 7 15 3 11 6 14 4 12 5 13 64 63 62 61 60 59 58 57 56 40 39 38 16 15 14 13 12 11 37 36 35 34 33 32 49 48 47 46 45 44 43 42 41 25 24 23 6 5 4 3 2 1 22 21 20 19 18 17 55 54 53 52 51 50 31 30 29 10 9 8 7 28 27 26 R466 10 12 11 1 3 2 5 4 7 6 9 8 R221 R80 SL-11461
 

Before performing diagnosis, refer to “CAUTION” in “General Description”. KEYLESS ENTRY(DIAGNOSTICS) >General Description>CAUTION

1. CHECK POWER SUPPLY CIRCUIT.

Connect DST-i to data link connector.

Does DST-i turn ON?

4

2

2. CHECK POWER SUPPLY CIRCUIT.
1.

Turn the ignition switch to ON.

2.

Using the tester, measure the voltage between data link connector and chassis ground.

Connector & terminal

(i288) No. 8 (+) — Chassis ground (−):

(i288) No. 16 (+) — Chassis ground (−):

Is the voltage 10 V or more?

3

  • Repair the power supply circuit.

  •  

    In this case, repair the following item:

    • Open or ground short circuit of harness between battery and data link connector

    • Blown out of fuse

3. CHECK HARNESS BETWEEN DATA LINK CONNECTOR AND CHASSIS GROUND (OPEN).
1.

Turn the ignition switch to OFF.

2.

Using the tester, measure the resistance between data link connector and chassis ground.

Connector & terminal

(i288) No. 4 — Chassis ground:

(i288) No. 5 — Chassis ground:

Is the resistance less than 5 Ω?

Check for poor contact of the data link connector, and repair a fault, if any. When no fault is found, 4

Repair the harness and connector.

4. CHECK SUBARU SELECT MONITOR.
1.

Connect the Subaru Select Monitor to a normal vehicle.

2.

Start the engine and establish communication between the Subaru Select Monitor and vehicle.

Is communication possible?

5

Use another Subaru Select Monitor because the CAN communication circuit of the Subaru Select Monitor is faulty.

5. CHECK LAN SYSTEM.

Perform the diagnosis for LAN system. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure>PROCEDURE

Is LAN system OK?

6

Perform the inspection according to the diagnosis for LAN system.

6. CHECK CONNECTOR.

Check TPMS & keyless entry CM connector or keyless entry CM connector, data link connector or intermediate connector for poor contact.

Is the connector OK?

7

Repair the connector.

7. CHECK FUSE.
1.

Turn the ignition switch to OFF.

2.

Remove a fuse from the fuse box.

3.

Check the fuse. SECURITY AND LOCKS>Relay and Fuse

Is the fuse OK?

8

Replace the fuse. If the replaced fuse blows out easily, repair the ground short circuit in harness between the TPMS & keyless entry CM or keyless entry CM and fuse.

8. CHECK POWER SUPPLY CIRCUIT FOR TPMS & KEYLESS ENTRY CM OR KEYLESS ENTRY CM CONNECTOR (OPEN CIRCUIT).
1.

Disconnect the TPMS & keyless entry CM or keyless entry CM connector.

2.

Turn the ignition switch to ON.

3.

Measure the voltage between the TPMS & keyless entry CM or the keyless entry CM connector and chassis ground.

Connector & terminal

Without TPMS

(R80) No. 12 (+) — Chassis ground (−):

With TPMS

(R221) No. 6 (+) — Chassis ground (−):

(R221) No. 12 (+) — Chassis ground (−):

Is the voltage 10 V or more?

9

Check for open or short circuit in the harness between the TPMS & keyless entry CM or keyless entry CM and fuses.

9. CHECK GROUND CIRCUIT FOR TPMS & KEYLESS ENTRY CM OR KEYLESS ENTRY CM (OPEN CIRCUIT).

Measure the resistance in harness between TPMS & keyless entry CM or keyless entry CM connector and chassis ground.

Connector & terminal

Without TPMS

(R80) No. 7 — Chassis ground:

With TPMS

(R221) No. 7 — Chassis ground:

Is the resistance less than 1 Ω?

Check the connection between the data link connector and Subaru Select Monitor.

Repair the harness for ground line.

KEYLESS ENTRY(DIAGNOSTICS) > Data Monitor　
OPERATION
 
KEYLESS ENTRY(DIAGNOSTICS) > Data Monitor　
LIST

Item

Content / display range

Standard

Note

Trip Count [count]

Time stamp information COMMON(diag)>Time Stamp

time

—

Count

—

Time Count

ms

—

Battery Voltage

Battery voltage

0 — 32 V

—

Ignition Signal(Line)

Condition of ignition power supply (direct line)

ON: When the switch is ON

OFF: When the switch is OFF

Keyless entry CM, always OFF

Ignition Signal (CAN)

Condition of ignition power supply (CAN communication)

ON: When the switch is ON

OFF: When the switch is OFF

—

Number of Registered Keys

Number of registered keyless entry

0 — 4

—

Max Number of Register Keys

Maximum number of registered keyless entry

0 — 4

—

Key-lock Warning SW

Key warning switch status

ON: When the switch is ON

OFF: When the switch is OFF

—

Power Saving Mode

Electricity save mode condition

Normal: Normal

Brownout: Saving

—

Keyless ID Registration Mode

Registration mode condition

Normal: Normal

Factory Reg: Factory registration mode

Dealer Reg: After market registration mode

Delete: Delete mode

—

KEYLESS ENTRY(DIAGNOSTICS) > Freeze Frame Data　
OPERATION
 
KEYLESS ENTRY(DIAGNOSTICS) > Freeze Frame Data　
LIST

Item

Content / display range

Standard

Note

Trip Count

Time stamp information COMMON(diag)>Time Stamp

time

—

Count

—

Time Count

ms

—

Battery Voltage

Battery voltage

0 — 32 V

—

Ignition Signal(Line)

Condition of ignition power supply (direct line)

ON: When the switch is ON

OFF: When the switch is OFF

Keyless entry CM, always OFF

Number of Registered Keys

Number of registered keyless entry

0 — 4

—

Power Saving Mode

Electricity save mode condition

OFF: Normal

Brownout: Saving

—

Keyless ID Registration Mode

Registration mode condition

Normal: Normal

Factory Reg: Factory registration mode

Dealer Reg: After market registration mode

Delete: Delete mode

—

KEYLESS ENTRY(DIAGNOSTICS) > Work Support　
OPERATION
1.

On [Start] screen, select [Diagnosis].

2.

On [Vehicle selection] screen, input the target vehicle information and select [OK].

3.

On [Main Menu] screen, select [Each System].

4.

On [Select System] screen, select [Keyless Entry].

5.

On [Select Function] screen, select [Work Support].

6.

Select a process item.

 
KEYLESS ENTRY(DIAGNOSTICS) > Work Support　
LIST

Item

Contents

Note

Keyless ID Registration

Registration of keyless ID

—

Keyless ID Deletion

Removal of keyless ID

—

ECU specifications information

Displays information of TPMS & keyless entry CM or the keyless entry CM.

—

KEYLESS ENTRY(DIAGNOSTICS) > Diagnostic Trouble Code (DTC)　
OPERATION
 
KEYLESS ENTRY(DIAGNOSTICS) > Diagnostic Trouble Code (DTC)　
LIST

Code

Description & trouble part

Reference

B2771

EEPROM PERFORMANCE

KEYLESS ENTRY(DIAGNOSTICS) >Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2771 EEPROM PERFORMANCE

B2772

CONTROL MODULE COMMUNICATION STUCK

KEYLESS ENTRY(DIAGNOSTICS) >Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2772 CONTROL MODULE COMMUNICATION STUCK

U0073

CONTROL MODULE COMMUNICATION BUS OFF

KEYLESS ENTRY(DIAGNOSTICS) >Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF

U0140

LOST COMMUNICATION WITH BODY CONTROL MODULE

KEYLESS ENTRY(DIAGNOSTICS) >Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0140 LOST COMMUNICATION WITH BODY CONTROL MODULE

U0155

LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE

KEYLESS ENTRY(DIAGNOSTICS) >Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0155 LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE

U0422

INVALID DATA RECEIVED FROM BODY CONTROL MODULE

KEYLESS ENTRY(DIAGNOSTICS) >Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0422 INVALID DATA RECEIVED FROM BODY CONTROL MODULE
KEYLESS ENTRY(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)　
DTC B2771 EEPROM PERFORMANCE

DTC detecting condition:

When all the following conditions are met.

  • Battery voltage stays at 10 V or more for longer than one second.

  • CAN bus is not in sleep state.

  • Clear memory is not in process.

  • Attempt to reading/writing EEPROM fails twice consecutively.

Trouble symptom:

  • The key cannot be registered.

  • Cannot be locked/unlocked with keyless entry system.

 

Before performing diagnosis, refer to “CAUTION” in “General Description”. KEYLESS ENTRY(DIAGNOSTICS) >General Description>CAUTION

1. CHECK DTC.
1.

Turn the ignition switch to OFF.

2.

Disconnect the TPMS & keyless entry CM connector or keyless entry CM connector.

3.

Connect the disconnected connectors.

4.

Turn the ignition switch to ON.

5.

Using the Subaru Select Monitor, perform the clear memory of [Keyless Entry]. COMMON(diag)>Clear memory

6.

Turn the ignition switch to OFF.

7.

Turn the ignition switch to ON.

8.

Read the DTC of [Keyless Entry] using the Subaru Select Monitor. KEYLESS ENTRY(DIAGNOSTICS) >Diagnostic Trouble Code (DTC)

Is DTC B2771 displayed? (Current malfunction)

Replace the TPMS & keyless entry CM or keyless entry CM. SECURITY AND LOCKS>Keyless Entry Control Module

  • Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

  •  

    In this case, temporary poor contact of connector, temporary open or short circuit of harness, or temporary EEPROM access error has occurred.

KEYLESS ENTRY(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)　
DTC B2772 CONTROL MODULE COMMUNICATION STUCK

DTC detecting condition:

When all the following conditions are met.

  • Battery voltage stays at 10 V or more for longer than one second.

  • CAN bus is not in sleep state.

  • Clear memory is not in process.

  • CAN message register freezes in the TPMS & keyless entry CM or the keyless entry CM

Trouble symptom:

  • Communication is impossible with Subaru Select Monitor.

  • Cannot be locked/unlocked with keyless entry system.

 

Before performing diagnosis, refer to “CAUTION” in “General Description”. KEYLESS ENTRY(DIAGNOSTICS) >General Description>CAUTION

1. CHECK DTC.
1.

Turn the ignition switch to OFF.

2.

Disconnect the TPMS & keyless entry CM connector or keyless entry CM connector.

3.

Connect the disconnected connectors.

4.

Turn the ignition switch to ON.

5.

Using the Subaru Select Monitor, perform the clear memory of [Keyless Entry]. COMMON(diag)>Clear memory

6.

Turn the ignition switch to OFF.

7.

Turn the ignition switch to ON.

8.

Read the DTC of [Keyless Entry] using the Subaru Select Monitor. KEYLESS ENTRY(DIAGNOSTICS) >Diagnostic Trouble Code (DTC)

Is DTC B2772 displayed? (Current malfunction)

Replace the TPMS & keyless entry CM or keyless entry CM. SECURITY AND LOCKS>Keyless Entry Control Module

  • Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

  •  

    In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

KEYLESS ENTRY(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)　
DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF

DTC detecting condition:

When all the following conditions are met.

 

Perform the diagnosis for LAN system. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure>PROCEDURE

KEYLESS ENTRY(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)　
DTC U0140 LOST COMMUNICATION WITH BODY CONTROL MODULE

DTC detecting condition:

When all the following conditions are met.

 

Perform the diagnosis for LAN system. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure>PROCEDURE

KEYLESS ENTRY(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)　
DTC U0155 LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE

DTC detecting condition:

When all the following conditions are met.

 

Perform the diagnosis for LAN system. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure>PROCEDURE

KEYLESS ENTRY(DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)　
DTC U0422 INVALID DATA RECEIVED FROM BODY CONTROL MODULE

DTC detecting condition:

When all the following conditions are met.

 

Perform the diagnosis for LAN system. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure>PROCEDURE

KEYLESS ENTRY(DIAGNOSTICS) > Diagnostics with Phenomenon　
LIST

Symptoms

Note

Both lock and unlock do not function with keyless entry system.

KEYLESS ENTRY(DIAGNOSTICS) >Diagnostics with Phenomenon>INSPECTION > BOTH LOCK AND UNLOCK DO NOT FUNCTION WITH KEYLESS ENTRY SYSTEM
KEYLESS ENTRY(DIAGNOSTICS) > Diagnostics with Phenomenon　
INSPECTION
1. BOTH LOCK AND UNLOCK DO NOT FUNCTION WITH KEYLESS ENTRY SYSTEM

Trouble causes:

  • Power supply circuit malfunction in TPMS & keyless entry CM or the keyless entry CM

  • Malfunction in TPMS & keyless entry CM or the keyless entry CM

  • Keyless key malfunction

 

  • Inspect LAN system according to the basic diagnostic procedure, and make sure that there is no fault.

  • Check that the TPMS & keyless entry CM or keyless entry CM is functioning.

  • Before performing diagnosis, refer to “CAUTION” in “General Description”. KEYLESS ENTRY(DIAGNOSTICS) >General Description>CAUTION

1. CHECK DOOR LOCK SWITCH.
no

Perform the instructed procedures.

yes
2. CHECK FUSE.
no

Perform the instructed procedures.

yes
3. CHECK HARNESS (POWER SUPPLY CIRCUIT).
no

Perform the instructed procedures.

yes
4. CHECK HARNESS (OPEN CIRCUIT).
no

Perform the instructed procedures.

yes
5. CHECK HARNESS (GROUND SHORT CIRCUIT).
no

Perform the instructed procedures.

yes
6. CHECK KEYLESS TRANSMITTER.
no

Perform the instructed procedures.

yes
7. CHECK TPMS & KEYLESS ENTRY CM OR KEYLESS ENTRY CM.
yes

Perform the instructed procedures.

no

Perform the instructed procedures.

1. CHECK DOOR LOCK SWITCH.

Check that lock/unlock operates by operating the keyless transmitter.

Does it lock/unlock normally?

2

Check the door lock circuit. SECURITY AND LOCKS>Door Lock Control System>INSPECTION > BASIC INSPECTION

2. CHECK FUSE.

Check the fuse. SECURITY AND LOCKS>Relay and Fuse>INSPECTION

Is the check result OK?

3

Replace the fuse.

3. CHECK HARNESS (POWER SUPPLY CIRCUIT).
1.

Disconnect the TPMS & keyless entry CM connector or keyless entry CM connector.

2.

Using a tester, measure the voltage between TPMS & keyless entry CM connector or TPMS CM connector and chassis ground.

Connector & terminal

Keyless entry CM

(R80) No. 12 (+) — Chassis ground (−):

Keyless entry & TPMS CM

(R221) No. 12 (+) — Chassis ground (−):

Is the voltage 9 — 16 V?

4

Repair the power supply circuit.

4. CHECK HARNESS (OPEN CIRCUIT).
1.

Disconnect the body integrated unit connector.

2.

Using a tester, measure the resistance between TPMS & keyless entry CM connector or keyless entry CM connector and body integrated unit.

Connector & terminal

Keyless entry CM

(R80) No. 2 — (i171) No. 1:

(R80) No. 1 — (i171) No. 2:

Keyless entry & TPMS CM

(R221) No. 2 — (i171) No. 1:

(R221) No. 1 — (i171) No. 2:

Is the resistance less than 1 Ω?

5

Repair or replace the open circuit of harness.

5. CHECK HARNESS (GROUND SHORT CIRCUIT).

Using a tester, measure the resistance between TPMS & keyless entry CM connector or keyless entry CM connector and chassis ground.

Connector & terminal

Keyless entry CM

(R80) No. 2 — Chassis ground:

(R80) No. 1 — Chassis ground:

Keyless entry & TPMS CM

(R221) No. 2 — Chassis ground:

(R221) No. 1 — Chassis ground:

Is the resistance 10 kΩ or more?

6

Repair or replace the short circuit of the harness.

6. CHECK KEYLESS TRANSMITTER.

Check the keyless transmitter battery. SECURITY AND LOCKS>Keyless Transmitter>INSPECTION

Is the battery OK?

7

Replace the keyless transmitter battery. SECURITY AND LOCKS>Keyless Transmitter

7. CHECK TPMS & KEYLESS ENTRY CM OR KEYLESS ENTRY CM.
1.

Connect the TPMS & keyless entry CM connector or keyless entry CM connector.

2.

Turn the ignition switch to OFF and close all doors.

3.

Perform the lock operation using the keyless key.

Does the door lock?

Currently, it is normal.

Replace the TPMS & keyless entry CM or keyless entry CM. WHEEL AND TIRE SYSTEM>Tire Pressure Monitoring System SECURITY AND LOCKS>Keyless Entry Control Module