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

Instrumentation and Warning Chimes

Pinpoint Tests

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

Normal Operation

The Instrument Cluster (IC) receives the Supplemental Restraint System (SRS) status from the Restraints Control Module (RCM) over the Medium Speed Controller Area Network (MS-CAN) communication bus. If a SRS concern is detected, the RCM sets a DTC and sends a message to the IC to turn on the air bag warning indicator.

If the SRS status message is missing for more than 5 seconds, the IC sets DTC U0151 and defaults the air bag warning indicator on. If the SRS status message is deemed invalid for more than 5 seconds, the IC defaults the air bag warning indicator on.

This pinpoint test is intended to diagnose the following:

- RCM
- IC


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

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Z1 CARRY OUT THE IC AIR BAG WARNING INDICATOR ACTIVE COMMAND USING THE SCAN TOOL


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC air bag warning indicator (Air bag) active command. Command the air bag warning indicator 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 Z2.

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

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Z2 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 Diagnostic Trouble Code Tests and Associated Procedures.

No
GO to Z3.

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Z3 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST


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

Yes
For DTC U0151, GO to Pinpoint Test AN. Pinpoint Test AN: DTC U0151

For all other DTCs, REFER to DTC Charts. Diagnostic Trouble Code Tests and Associated Procedures

No
If the air bag warning indicator is always on, INSTALL a new RCM. REFER to Supplemental Restraint System Driver Air Bag Module. TEST the system for normal operation.

If the air bag warning indicator is never on, the system is functioning correctly.

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