B1411 – Passenger’s (front) air bag module (squib) system (open- circuited in the squib circuit) MMC Colt

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OPERATION

The SRS-ECU judges how severe a collision is by detecting signals from the front air bag analogue G-sensor. If the impact is over a predetermined level, the SRS-ECU sends an ignition signal. At this time, if the front air bag safing G-sensor is on, the SRS air bag will inflate.

The ignition signal is input to the air bag module to inflate the air bag.

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DIAGNOSIS CODE SET CONDITIONS

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Open circuit in the passenger’s (front) air bag module (squib) circuit

Improper connector contact

Malfunction of the SRS-ECU

Malfunction of the passenger’s air bag cut off switch

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DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics.

Q. Is the CAN bus line found to be normal?

STEP 2. Check whether the diagnosis code is reset.

Q. Is the diagnosis code set?

STEP 3. Check the passenger’s air bag cut off switch.

Q. Is the diagnosis code set?

STEP 4. Check the passenger’s (front) air bag module (M.U.T.-III diagnosis code).

Q. Is diagnosis code B1411 set?

STEP 5. Resistance measurement between the SRS-ECU connector B-109 (terminal No.22 and 23) and the passenger’s (front) air bag module connector B-10 (terminal No.1 and 2).

SRS-ECU connector B-109 (terminal No.22) and the passenger’s (front) air bag module connector B-10 (terminal No.1)

SRS-ECU connector B-109 (terminal No.23) and the passenger’s (front) air bag module connector B-10 (terminal No.2)

Q. Are the check results normal?

STEP 6. Check whether the diagnosis code is reset.

Q. Is diagnosis code B1411 set?