Code No.B1441:
Curtain air bag module (RH) (squib) system (open-circuited in the squib circuit)
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If diagnosis code B1441 is set in the SRS-ECU, always diagnose
the CAN main bus line.
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OPERATION
The SRS-ECU judges how severe a collision is by detecting signals from the side impact
sensors and the side air bag safing G-sensor. If the impact is over a predetermined level, the
SRS-ECU outputs an ignition signal. At this time, if the side air bag safing G-sensor is on,
the curtain air bag module will deploy.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if curtain air bag module squib (RH) wire(s) are open-circuited.
PROBABLE CAUSES
- Improper connector contact
- Open circuit in the curtain air bag module (RH) (squib) circuit
- Malfunction of the SRS-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics.
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| warning |
Since the radiator fan rotates during CAN bus line diagnostics,
make sure that no one is servicing the engine compartment before diagnosing the CAN bus line.
Since the CAN communication stops when diagnosing the CAN bus line, the ETACS-ECU detects the
time-out of the engine-ECU, and activates the radiator fan to prevent overheating as fail-safe.
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Use the M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Go to Step 2.
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 Repair the CAN bus line (Refer to GROUP 54C, Troubleshooting - Can Bus
Diagnosis Table  ).
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STEP 2. Check whether the diagnosis code is reset.
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Check again if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch to the "ON" position.
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(3)Check if the diagnosis code is set.
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(4)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is the diagnosis code set?
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Go to Step 3.
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There is an intermittent malfunction such as poor engaged connector(s) or open
circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
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STEP 3. Check the curtain air bag module (RH) (M.U.T.-III diagnosis
code).
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(1)Disconnect the negative battery terminal.
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(2)Use a flat-tipped screwdriver to pull out forward and unlock the locking button of the
harness side connector, and then disconnect curtain air bag module (RH) connector C-06.
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(3)Connect special tool dummy resistor (MB991865) to special tool resistor harness (MB991884).
(4)Connect special tool resistor harness (MB991884) to the C-06 harness side connector.
(5)Connect the negative battery terminal.
(6)Erase diagnosis code memory, and then check the diagnosis code.
Q.
Is diagnosis code B1441 set?
Go to Step 4.
Replace the curtain air bag module (RH) (Refer to ).
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STEP 4. Resistance measurement between SRS-ECU connector B-109 (terminal
No.7 and 8) and the curtain air bag module (RH) connector C-06 (terminal No.2 and 1)
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(1)Disconnect the negative battery terminal.
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(2)Disconnect SRS-ECU connector B-109.
| danger |
To prevent the air bag from deploying unintentionally, disconnect the curtain air bag
module (RH) connector C-06 to short the squib circuit.
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(3)Use a flat-tipped screwdriver to pull out forward and unlock the locking button of the
harness side connector, and then disconnect curtain air bag module (RH) connector C-06.
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(4)
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Insert an insulator such as a cable tie to a depth of 4mm or more, otherwise the short
bar will not be released.
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Insert a cable tie [3 mm wide, 0.5 mm thick] between terminals 32 and
the short spring to release the short spring.
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(5)Connect C-06 harness side connector to special tool resistor harness (MB991884).
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(6)Resistance measurement between the following terminals.
- SRS-ECU connector B-109 terminal No.7 and special tool terminal No.1
- SRS-ECU connector B-109 terminal No.8 and special tool terminal No.2
OK: Continuity (less than 2 Ω)
Q.
Are the check results normal?
Go to Step 5.
Repair the harness wire between SRS-ECU connector B-109 (terminal No.7 and 8)
and curtain air bag module (RH) connector C-06 (terminal No.2 and 1).
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STEP 5. Check whether the diagnosis code is reset.
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Q.
Is diagnosis code No.B1441 set?
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Replace the SRS-ECU (Refer to ).
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An intermittent malfunction is suspected (Refer to GROUP 00, How to Cope with
Intermittent Malfunction ).
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