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.
DIAGNOSIS CODESET CONDITIONS
Damaged wiring harnesses or connectors
Short to earth in the side-airbag module (RH) (squib) harness
Malfunction of the SRS-ECU
STEP 1. M.U.T.-III CAN bus diagnostics.
Is the CAN bus line found to be normal?
STEP 2. Check whether the diagnosis code is reset.
Is the diagnosis code set?
STEP 3. Check the side-airbag module (RH) (M.U.T.-III diagnosis code).
Is diagnosis code B1422 set?
STEP 4. Resistance measurement at the SRS-ECU connector B-109.
Are the check results normal?
STEP 5. Check the side-airbag module (RH) (M.U.T.-III diagnosis code).
Is diagnosis code B1420 set?
STEP 6. Check whether the diagnosis code is reset.