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Pinpoint Test T: 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 high speed controller area network (HS-CAN) communication bus. If an SRS concern is detected, the RCM sets a DTC and sends a message to the instrument cluster (IC) to turn on the air bag warning indicator. If the SRS status message is missing or is deemed invalid for more than 5 seconds, the instrument cluster (IC) sets DTC U0151 and defaults the air bag warning indicator on.

This pinpoint test is intended to diagnose the following:

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

  1. T1 CARRY OUT THE INSTRUMENT CLUSTER (IC) RESTRAINTS OUTPUT CONTROL ACTIVE COMMAND USING THE SCAN TOOL 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster (IC) DataLogger
    • Select the instrument cluster (IC) air bag warning indicator (RESTRAINT) active command mode and 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? 
    1. YES  : Go to  T2.
    2. NO  : Go to  T5.
  2. T2 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND RCM SELF-TESTS 
    • Check for recorded RCM DTCs from the continuous and on-demand self-tests.
    • Are any RCM DTCs recorded? 
    1. YES  : REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.
    2. NO  : Go to  T3.
  3. T3 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND INSTRUMENT CLUSTER (IC) SELF-TESTS 
    • Check for recorded instrument cluster (IC) DTCs from the continuous and on-demand self-tests.
    • Are any DTCs recorded? 
    1. YES  : For DTC B1318, go to Pinpoint Test AD  .

      For DTC U0151, go to Pinpoint Test AJ  .

      For all other DTCs, REFER to the appropriate DTC Chart in this service information.

    2. NO  : Go to  T4.
  4. T4 CHECK FOR CORRECT RCM OPERATION 
    • Disconnect all the RCM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the RCM connectors and make sure they seat correctly.
    • Operate the system and determine if the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new RCM. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article. TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
  5. T5 CHECK FOR CORRECT INSTRUMENT CLUSTER (IC) OPERATION 
    • Disconnect the instrument cluster (IC) connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the instrument cluster (IC) connector and make sure it seats correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new instrument cluster (IC). REFER to Instrument Cluster (IC) . TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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