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Pinpoint Test A: Both High Beams Are Inoperative

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. 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.
NOTE: The battery ground cable must be disconnected for accurate test results when checking ground circuits for continuity to ground.
  1. A1 CHECK THE HIGH BEAM INDICATOR 
    • Key in ON position.
    • Place the headlamp switch in the HEADLAMPS ON position.
    • Place the multifunction switch in the HIGH BEAM position.
    • Does the high beam indicator illuminate? 
    1. YES  : Go to  A5.
    2. NO  : Go to  A2.
  2. A2 CHECK THE MULTIFUNCTION SWITCH 
    • Place the headlamp switch in the OFF position.
    • Key in OFF position.
    • Disconnect: Multifunction Switch C202
    • Connect a fused (5A) jumper wire between the multifunction switch C202-6, circuit CLF02 (GY/BN), harness side and the multifunction switch C202-8, circuit GD114 (BK/BU), harness side.
      • Fig 1: Connecting Fused Jumper Wire
      GF0023430Courtesy of FORD MOTOR CO.
    • Place the headlamp switch in the HEADLAMPS ON position.
    • Key in ON position.
    • Do the high beams illuminate? 
    1. YES  : REMOVE the jumper wire. INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES article. TEST the system for normal operation.
    2. NO  : REMOVE the jumper wire. Go to  A3.
  3. A3 CHECK CIRCUIT GD114 (BK/BU) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the multifunction switch C202-8, circuit GD114 (BK/BU), harness side and ground.
      • Fig 2: Measuring Resistance
      GF0023431Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A4.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. A4 CHECK CIRCUIT CLF02 (GY/BN) FOR AN OPEN 
    • Disconnect: SJB C2280b
    • Measure the resistance between the multifunction switch C202-6, circuit CLF02 (GY/BN), harness side and the SJB C2280b-27, circuit CLF02 (GY/BN), harness side.
      • Fig 3: Checking Circuit For Open
      GF0023432Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A6.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. A5 CHECK CIRCUIT CLF08 (YE/VT) FOR AN OPEN 
    • Disconnect: SJB C2280e
    • Connect a fused (15A) jumper wire between the SJB C2280e-1, circuit CDC34 (WH/OG), harness side and the SJB C2280e-2, circuit CLF08 (YE/VT), harness side.
      • Fig 4: Connecting Fused Jumper Wire
      GF0023433Courtesy of FORD MOTOR CO.
    • Key in ON position.
    • Do the high beams illuminate? 
    1. YES  : REMOVE the jumper wire. VERIFY the SJB fuse 23 (15A) is OK. If OK, go to  A6.
    2. NO  : REMOVE the jumper wire. REPAIR the circuit. TEST the system for normal operation.
  6. A6 CHECK FOR CORRECT SJB OPERATION 
    • Disconnect all the SJB connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the SJB 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 SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES 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.
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