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

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

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

Normal Operation

The air bag warning indicator provides an indication that there is a restraint system concern and the air bag may be inoperable or have degraded performance. If the Instrument Cluster (IC) does not receive the restraint control command over the communication network, the IC illuminates the air bag warning indicator. When a fault is detected in the primary air bag warning indication, the IC sets DTC B1868 and defaults to the secondary warning (warning chime) and the air bag warning chime sounds.

This pinpoint test is intended to diagnose the following:

- Restraints Control Module (RCM)
- IC



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

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M1 RETRIEVE THE RECORDED DTCs FROM THE RCM SELF-TEST


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

Yes
If the air bag warning indicator is always on, REFER to Air Bag Systems to continue diagnosis of the air bag system.

If the air bag warning indicator is never on, GO to M2.

No
GO to M2.

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M2 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST


- Check for recorded continuous memory IC DTCs.
- Are any DTCs recorded?

Yes
For DTC U1900, REFER to Information Bus to diagnose communication with the RCM.

For all other DTCs, REFER to DTC Charts. [1][2]Diagnostic Trouble Code Descriptions

No
GO to M3.

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M3 CARRY OUT THE IC INDICATOR LAMP CONTROL 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 (RESTRAINT) 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
INSTALL a new RCM. REFER to Air Bag Systems. TEST the system for normal operation. CLEAR the DTCs.
REPEAT the self-test.

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

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