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Pinpoint Test I: The Safety Belt Warning Indicator Is Never/Always On

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. I1 CHECK THE SAFETY BELT WARNING INDICATOR OPERATION 
    • Depower the supplemental restraint system (SRS). Refer to SUPPLEMENTAL RESTRAINT SYSTEM article.
    • Key in OFF position.
    • Disconnect: RCM C310a
    • Connect a fused (10A) jumper wire between the RCM C310a-22, circuit 1083 (LB/BK), harness side and ground.
      • Fig 1: Checking Safety Belt Warning Indicator Operation
      GF0004453Courtesy of FORD MOTOR CO.
    • Observe the safety belt warning indicator with the jumper wire connected and disconnected.
    • Key in ON position.
    • Does the safety belt warning indicator lamp illuminate with the jumper wire connected and turn off when disconnected? 
    1. YES  : REMOVE the jumper wire. Go to  I5 .
    2. NO  : REMOVE the jumper wire. Go to  I2 .
  2. I2 CHECK CIRCUIT 1083 (LB/BK) FOR AN OPEN AND A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220a
    • Measure the resistance between the instrument cluster C220a-18, circuit 1083 (LB/BK), harness side and the RCM C310a-22, circuit 1083 (LB/BK), harness side; and between the instrument cluster C220a-18, circuit 1083 (LB/BK), harness side and ground.
      • Fig 2: Checking Circuit 1083 (LB/BK) For Open And Short To Ground
      GF0004454Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the instrument cluster and the RCM, and greater than 10,000 ohms between the instrument cluster and ground? 
    1. YES  : Go to  I3.
    2. NO  : REPAIR the circuit. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article. TEST the system for normal operation.
  3. I3 CHECK CIRCUIT 1083 (LB/BK) FOR A SHORT TO VOLTAGE 
    • Key in ON position.
    • Measure the voltage between the instrument cluster C220a-18, circuit 1083 (LB/BK), harness side and ground.
      • Fig 3: Checking Circuit 1083 (LB/BK) For Short To Voltage
      GF0004455Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article. TEST the system for normal operation.
    2. NO  : Go to  I4.
  4. I4 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect all the instrument cluster connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the 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 (IC)  in this article. REPOWER the SRS. 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. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.
  5. I5 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 verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new RCM. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article. REPOWER the SRS. 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. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.
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