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

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. T1 CHECK THE AIR BAG WARNING INDICATOR LAMP OPERATION 
    • Key in ON position.
    • Observe the air bag warning indicator lamp prove out.
    • Does the air bag lamp prove out correctly? 
    1. Yes  : System is operating correctly at this time.
    2. No  : GO to T2.
  2. T2 RETRIEVE THE RESTRAINT CONTROL MODULE (RCM) RECORDED DTCS FROM BOTH THE CONTINUOUS AND ON DEMAND SELF-TESTS 
    • Use the recorded RCM DTCs from the continuous and on demand self-test.
    • Are DTCs present? 
    1. Yes  : REFER to AIR BAG RESTRAINT SYSTEMS to continue diagnosis of the DTCs. TEST the system for normal operation.
    2. No  : If the airbag warning indicator never on, GO to T3 If the airbag warning indicator always on, GO to  T6.
  3. T3 CHECK THE INSTRUMENT CLUSTER ELECTRICAL CONNECTORS 
    NOTE: When the instrument cluster is removed, check for correct installation of the warning indicators.
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220a, C220b.
    • Connect: Instrument Cluster C220a, C220b.
    • Key in ON position.
    • Observe the air bag warning indicator.
    • Does the air bag warning indicator prove-out correctly? 
    1. Yes  : System is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
    2. No  : GO to T4.
  4. T4 ISOLATE THE AIR BAG DIAGNOSTIC MODULE 
    • Key in OFF position.
    • Deactivate the restraint control supplemental air bag system. REFER to AIR BAG RESTRAINT SYSTEMS .
    • Disconnect: Restraint Control Module (RCM) C2041.
      • NOTE: If the fuse fails, repair the circuit for a short to power.
    • Connect a fused (5A) jumper wire between the RCM C2041 pin 20, circuit 608 (BK/YE) harness side and ground.
      • Fig 1: Checking Isolate Air Bag Diagnostic Module
      G03277089Courtesy of FORD MOTOR CO.
    • Key in ON position.
    • Observe the air bag warning indicator.
    • Does the air bag warning indicator illuminate? 
    1. Yes  : Remove the jumper wire, GO to  T8.
    2. No  : Remove the jumper wire, GO to T5.
  5. T5 CHECK CIRCUIT 608 (BK/YE) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220b.
    • Measure the resistance between the instrument cluster C220b pin 13, circuit 608 (BK/YE) harness side and the RCM C2041 pin 20, circuit 608 (BK/YE) harness side.
      Fig 2: Checking Circuit 608 (BK/YE) For An Open
      G03277090Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to T9.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  6. T6 CHECK CIRCUIT 608 (BK/YE) 
    • Deactivate the restraint control supplemental air bag system. REFER to AIR BAG RESTRAINT SYSTEMS .
    • Key in OFF position.
    • Disconnect: RCM C2041.
    • Key in ON position.
      • NOTE: Make sure the shorting bar is not engaged between pins 20 and 21 on the RCM connector when monitoring the air bag warning indicator.
    • Monitor the air bag warning indicator lamp.
    • Does the air bag warning indicator lamp continue to illuminate? 
    1. Yes  : GO to T7.
    2. No  : GO to  T8.
  7. T7 CHECK CIRCUIT 608 (BK/YE) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220b.
      • NOTE: Make sure the shorting bar is not engaged between pins 20 and 21 on the RCM connector when carrying out this test.
    • Measure the resistance between the instrument cluster C220b pin 13, circuit 608 (BK/YE) harness side and ground.
      • Fig 3: Checking Circuit 608 (BK/YE) For Short To Ground
      G03277091Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes  : GO to  T9.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  8. T8 CHECK FOR CORRECT RESTRAINT CONTROL MODULE (RCM) OPERATION 
    • Disconnect the RCM connector.
    • Check for:
    • Corrosion
    • Pushed-out pins
    • Connect the RCM 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 RCM. REFER to AIR BAG RESTRAINT SYSTEMS article. CLEAR the DTCs. 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. CLEAR the DTCs. REPEAT the self-test.
  9. T9 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect all instrument cluster connectors.
    • Check for:
    • Corrosion
    • Pushed-out pins
    • Incorrectly installed bulb sockets
    • Burnt-out bulbs
    • Connect all instrument cluster connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. Yes  : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . 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. CLEAR the DTCs. REPEAT the self-test.
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