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Pinpoint Test C: The High Beams Are Inoperative

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
  1. C1 CHECK THE VOLTAGE TO THE HIGH BEAM RELAY 
    • Disconnect: High Beam Relay C1050.
    • Place the headlamp switch in the headlamps ON position.
    • Place the multifunction switch in the high beam position. Measure the voltage between the high beam relay 11050-2, circuit 697 (BN), harness side and ground; and between the high beam relay C1050-3, circuit 212 (DB), harness side and ground.
      Fig 1: Checking Voltage To High Beam Relay
      G03945596Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 
    • Yes  : GO to C2.
    • No  : If circuit 697 (BN), GO to  C4.

      If circuit 212 (DB), REPAIR the circuit. TEST the system for normal operation.

  2. C2 CHECK CIRCUITS 12 (LG/BK) AND 632 (GY/OG) FOR AN OPEN 
    • Disconnect: LH Headlamp C1021 (Mountaineer) or C1020 (Explorer).
    • Measure the resistance between LH headlamp, C1021-1 (Mountaineer) or C1020-1 (Explorer), circuit 12 (LG/BK), harness side and the high beam relay C1050-5, circuit 632 (GY/OG), harness side.
      Fig 2: Checking Circuits 12 (LG/BK) And 632 (GY/OG) For An Open
      G03945597Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to C3.
    • No  : REPAIR circuit 12 (LG/BK) or 632 (GY/OG) as necessary. TEST the system for normal operation.
  3. C3 CHECK CIRCUIT 1205 (BK) FOR AN OPEN 
    • Measure the resistance between the high beam relay C1050-1, circuit 1205 (BK), harness side and ground.
      Fig 3: Measuring Resistance Between Relay Socket Pin And Ground
      G03879816Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new high beam relay. TEST the system for normal operation.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  4. C4 CHECK CIRCUIT 697 (BN) FOR AN OPEN 
    • Carry out the multifunction switch component test. Refer to COMPONENT TESTING article.
    • Is the multifunction switch OK? 
    • Yes  : REPAIR the circuit. TEST the system for normal operation.
    • No  : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES . TEST the system for normal operation.
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