B1420 – Side-airbag module (RH) (squib) system (short-circuited between terminals of the squib circuit) MMC Colt

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OPERATION

The SRS-ECU judges how severe a collision is by detecting signals from the left and right side impact sensors. If the impact is over a predetermined level, the SRS-ECU sends an ignition signal. At this time, if the side-airbag safing G-sensor is on, the SRS side-airbag will inflate.

The ignition signal is input to the side-airbag module to inflate the side-airbag.

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DIAGNOSIS CODE SET CONDITIONS

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PROBABLE CAUSES

Improper engaged connector or defective short spring*

Short between the side-airbag module (RH) (squib) circuit terminals

Damaged connector(s)

Malfunction of the SRS-ECU

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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 SRS-ECU connector B-109, and side-airbag module connector C-04, C-04-1 (M.U.T.-III diagnosis code).

Q. Is diagnosis code B1420 out put?

STEP 4. Check the side-airbag module (RH) (M.U.T.-III diagnosis code).

Q. Is diagnosis code B1420 set?

STEP 5. Resistance measurement at the SRS-ECU connector B-109.

Q. Is the check result normal?

STEP 6. Check the side-airbag module (RH) (M.U.T.-III diagnosis code).

Q. Is diagnosis code B1420 set?

STEP 7. Check whether the diagnosis code is reset.

Q. Is diagnosis code B1420 set?