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Pinpoint Test S: The 4X4 And 4X4 Low 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. S1 DETERMINE THE CONDITION 
    • Key in ON position.
    • Observe the 4x4 indicators.
    • Is a 4x4 indicator always on? 
    1. Yes  : GO to S2.
    2. No  : GO to  S4.
  2. S2 CHECK THE 4WD CONTROL MODULE 
    • Key in OFF position.
    • Disconnect: 4WD Control Module C281b.
    • Observe the 4x4 indicator.
    • Key in ON position.
    • Did the 4x4 indicator turn off?
    1. Yes  : GO to  S9.
    2. No  : GO to S3.
  3. S3 CHECK CIRCUITS 784 (LB/BK) AND 783 (GY) FOR A SHORT 

    TO GROUND 

    • Key in OFF position.
    • Disconnect: Instrument Cluster C220a.
    • Measure the resistance between the instrument cluster C220a pin 18, circuit 784 (LB/BK), harness side and ground; and between the instrument cluster C220a pin 17, circuit 783 (GY), harness side and ground.
      Fig 1: Checking Circuits 784 (LB/BK) And 783 (GY) For Short
      G03277084Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    1. Yes  : GO to  S10.
    2. No  : REPAIR the circuit(s) in question. TEST the system for normal operation.
  4. S4 CHECK THE FOUR WHEEL DRIVE (4WD) OPERATION 
    • Verify the operation of the 4WD function.
    • Does the 4WD function correctly? 
    1. Yes  : If 4x4 LOW indicator, GO to  S7.

      If 4x4 indicator, GO to S5.

    2. No  : REFER to FOUR WHEEL DRIVE SYSTEMS to continue diagnosis of the 4WD system.
  5. S5 CHECK THE 4X4 HIGH INDICATOR 
    • Key in OFF position.
    • Disconnect: 4WD Module C281b.
      • NOTE: If the fuse fails, repair the circuit for a short to power.
    • Connect a fused (5A) jumper wire between the 4WD module C281b pin 6, circuit 783 (GY), harness side and ground.
      • Fig 2: Checking 4X4 High Indicator
      G03277085Courtesy of FORD MOTOR CO.
    • Key in ON position.
    • Does the 4x4 HIGH indicator illuminate? 
    1. Yes  : GO to  S9.
    2. No  : GO to S6.
  6. S6 CHECK CIRCUIT 783 (GY) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220a.
    • Measure the resistance between the 4WD module C281b pin 6, circuit 783 (GY), harness side and the instrument cluster C220a pin 17, circuit 783 (GY), harness side.
      Fig 3: Checking Circuit 783 (GY) For An Open
      G03277086Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to  S10.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  7. S7 CHECK THE 4X4 LOW INDICATOR 
    • Key in OFF position.
    • Disconnect: 4WD Module C281b.
      • NOTE: If the fuse fails, repair the circuit for a short to power.
    • Connect a fused (5A) jumper wire between the 4WD module C281b pin 9, circuit 784 (LB/BK), harness side and ground.
      • Fig 4: Checking 4X4 Low Indicator
      G03277087Courtesy of FORD MOTOR CO.
    • Key in ON position.
    • Does the 4X4 LOW indicator illuminate? 
    1. Yes  : GO to  S9.
    2. No  : GO to S8.
  8. S8 CHECK CIRCUIT 784 (LB/BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220a.
    • Measure the resistance between the 4WD module C281b pin 9, circuit 784 (LB/BK), harness side and the instrument cluster C220a pin 18, circuit 784 (LB/BK), harness side.
      Fig 5: Checking Circuit 784 (LB/BK) For An Open
      G03277088Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to  S10.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  9. S9 CHECK FOR CORRECT 4WD MODULE OPERATION 
    • Disconnect all 4WD module connectors.
    • Check for:
    • Corrosion
    • Pushed-out pins
    • Connect all 4WD module 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 4WD module. REFER to FOUR WHEEL DRIVE SYSTEMS . CLEAR the DTCs. REPEAT the 4WD module self-test.
    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.
  10. S10 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect all instrument cluster connectors.
    • Check for:
    • Corrosion
    • Pushed-out pins
    • 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 . CLEAR the DTCs. TEST the system for nor
    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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