B1057

B1052, B1057 DRIVER AIRBAG MODULE





Description
For driver air bag module, crash is judged by main "G" sensor output signal and safing algorithm in front direction.

OPERATION
In case of frontal collision whose acceleration exceeds the specified level, the ignition materials are ignited by electric ignition system. The system burns the gas generating materials resulting in a chemical reaction. This generates hot gases that flow into the air bag through a filter and expand the bag.

STRUCTURE
Driver air bag module mainly consists of air bag and inflator that inflates air bag.

INSTALLATION
Driver air bag module is installed on the center of steering wheel with fixed bolts.




DTC Logic

DTC Logic:

DTC CONFIRMATION PROCEDURE
1.CHECK SELF-DIAG RESULT
With CONSULT-III
1. Turn ignition switch ON.
2. Perform "AIR BAG" Self Diagnostic Result.
Without CONSULT-III
1. Turn ignition switch ON.
2. Check the air bag warning lamp status. Refer to Reading and Clearing Diagnostic Trouble Codes.

NOTE:
SRS does not enter diagnosis mode if no malfunction is detected in user mode.
Is malfunctioning part detected?
YES - Refer to B1080.
NO - INSPECTION END




Diagnosis Procedure

WARNING:
- Before servicing, turn ignition switch OFF, disconnect battery negative terminal and wait at least 3 minutes. (To discharge backup capacitor.)
- Never use unspecified tester or other measuring device.
1.CHECK HARNESS CONNECTOR
Check the harness connector.
Is the inspection result normal?
YES - GO TO 2.
NO - Replace harness connector.
2.CHECK WIRING HARNESS
Check the wiring harness externals.
Is the inspection result normal?
YES - GO TO 3.
NO - Replace wiring harness.
3.CHECK SPIRAL CABLE CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect driver air bag module harness connector and combination switch (spiral cable) harness connector.
3. Check continuity between driver air bag module harness connector and combination switch (spiral cable) harness connector.





4. Check continuity between driver air bag module harness connector and ground.





Is the inspection result normal?
YES - GO TO 4.
NO - Replace combination switch (spiral cable). Refer to Exploded View.
4.REPLACE DRIVER AIR BAG MODULE
1. Replace driver air bag module. Refer to Exploded View.
2. Perform DTC confirmation procedure. Refer to B1080.
Is DTC detected?
YES - GO TO 5.
NO - INSPECTION END
5.REPLACE AIR BAG DIAGNOSIS SENSOR UNIT
1. Replace air bag diagnosis sensor unit. Refer to Exploded View.
2. Perform DTC confirmation procedure. Refer to B1080.
Is DTC detected?
YES - GO TO 1.
NO - INSPECTION END