B1157

DTC B1157 (No. 1157): Air Bag Deployment Signal Input

Wiring Diagram

Advanced air bag model










Non-advanced air bag model










DTC Detecting Condition and Possible Cause






Flow Test Description

Step 1: Check DTC for SDM.

DTC Troubleshooting

1. DTC check of SDM

Check DTC stored in SDM referring to DTC Check DTC Check:Advanced Air Bag or DTC Check DTC Check:Except Advanced Air Bag.

Is DTC B1021 detected?
YES -
Go to Air Bag Module Exploded DTC B1021: Air Bag Module Exploded:Advanced Air Bag or Air Bag Module Deployed DTC B1021: Air Bag Module Deployed:Except Advanced Air Bag.
NO -
Go to Step 2.

2. DTC check of BCM

Clear DTC.
Recheck BCM for DTC.

Is DTC B1157 detected?
YES -
Substitute a known-good BCM and recheck.
NO -
Air bag has deployed in past. (DTC is not cleared)