Pinpoint Tests AA: The Air Bag Warning Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Test AA: The Air Bag Warning Indicator Is Never/Always On

Normal Operation

The Instrument Panel Cluster (IPC) receives the Supplemental Restraint System (SRS) status from the Restraints Control Module (RCM) over the High Speed Controller Area Network (HS-CAN) communication bus. If an SRS concern is detected, the RCM sets a DTC and sends a request to the IPC to illuminate the air bag warning indicator.

If the SRS status is missing or invalid for less than 5 seconds, the IPC defaults the air bag warning indicator to the last state (on or off) based upon the last known good message received. If the SRS status message is deemed invalid for more than 5 seconds, the IPC defaults the air bag warning indicator on. If the SRS status message is missing for more than 5 seconds, the IPC sets DTC U0151:00 and defaults the air bag warning indicator on.

This pinpoint test is intended to diagnose the following:

- RCM
- IPC

PINPOINT TEST AA: THE AIR BAG WARNING INDICATOR IS NEVER/ALWAYS ON

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AA1 CARRY OUT THE IPC RESTRAINTS OUTPUT CONTROL ACTIVE COMMAND USING THE SCAN TOOL

- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IPC DataLogger.
- Select the IPC all warning indicators (AIRBAG_LMP) active command. Command all the warning indicators on and off. Observe the air bag warning indicator.
- Does the air bag warning indicator illuminate when commanded on and turn off when commanded off?

Yes
GO to AA2.

No
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Service and Repair. TEST the system for normal operation.

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AA2 RETRIEVE THE RECORDED DTCs FROM THE RCM SELF-TEST

- Check for recorded RCM DTCs from the self-test.
- Are any DTCs recorded?

Yes
REFER to Supplemental Restraint System Testing and Inspection.

No
GO to AA3.

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AA3 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST

- Check for recorded IPC DTCs from the self-test.
- Are any DTCs recorded?

Yes
For DTC U0151:00, GO to Pinpoint Test AR. For all other DTCs, REFER to DTC Charts. Pinpoint Tests AR: DTC U0151:00

No
If the air bag warning indicator is never on, the system is operating correctly at this time. If the air bag warning indicator is always on, INSTALL a new RCM. REFER to Supplemental Restraint System Service and Repair. TEST the system for normal operation.

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