B1021

DTC B1021: Driver Air Bag Initiator Circuit Resistance High

Wiring Diagram:

CAUTION:
- Be sure to perform Air Bag Diagnostic System Check:H25 Engine Model before starting diagnosis according to flow. Diagnostic Strategies
- When measurement of resistance or voltage is required in this flow, use a tester along with a correct terminal adapter from special tool (Connector test adapter kit).
- When a check for proper connection is required, refer to Inspection of Intermittent and Poor Connections:H25 Engine Model. Intermittents and Poor Connections
- If there is open circuit in the air bag wire harness, connector or terminal is found damaged, replace the wire harness, connector and terminal as an assembly.

DTC Will Set when
The combined resistance of the driver air bag (inflator) module, contact coil assembly, harness wiring and connector terminal contact is above a specified value for specified time.

Flow Test Description
Step 1: Check whether malfunction is in contact coil and driver air bag (inflator) module or the others.
Step 2: Check driver air bag (inflator) module initiator circuit.
Step 3: Check whether malfunction is in contact coil or driver air bag (inflator) module.

Step 1:

Step 2:

Step 3:

DTC Troubleshooting