B1406

CIRCUIT DESCRIPTION
The release system for the airbag consists of the SRSCM, an interface unit and PPD.

The above DTCs are recorded when the defect or communication error of PPD is detected in the PPD circuit.




WIRING DIAGRAM

INSPECTION PROCEDURE
1. Preparation (See step "1" of DTC B1111/B1112 - Battery voltage too high/low "Inspection Procedure").




2. Check PPD circuit (Communication error).

Check continuity between SRSCM connector and PPD interface unit as high (+) and high, low (-) and low (-).

OK: Continuity

NG: Replace harness between SRSCM and PPD I/F unit.

OK: Continue to next step.

3. Check PPD interface unit.

Check continuity of PPD interface unit as high (+) and high (+), low (-) and low (-).

4. Check PPD sensor (Defect).




CHECK: Check the resistance in accordance with the changed weight.

R <= 50 kohms for W >= 15 kg
R > 50 kohms for W <= 0.6 kg

NG: Replace PPD sensor.

OK: Continue to next step.

5. Check PPD squib.

PREPARATION
1. Connect connector to SRSCM.
2. Connect negative (-) terminal cable to battery, and wait at least 30 seconds.




CHECK:
1. Turn ignition switch to ON, and wait at least 30 seconds.
2. Clear malfunction code stored in memory with Hi-scan.
3. Turn ignition switch to LOCK, and wait at least 30 seconds.
4. Turn ignition switch to ON, and wait at least 30 seconds.
5. Using Hi-scan, check DTC.

DTC is not output.

HINT: Codes other than these ones may be output at this time, but they are not relevant to this check.

NG: Replace SRSCM.

OK: From the results of the above inspection, the malfunctioning part can now be considered normal.