Pinpoint Test A: The High Beams Are Inoperative

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

A1 CHECK THE FLASH-TO-PASS OPERATION
- Place the multifunction switch in the FLASH-TO-PASS position.
- Do the high beam headlamps illuminate?
Yes : GO to A5.

No : GO to A2.
A2 CHECK THE MULTIFUNCTION SWITCH INPUT
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: LCM Multifunction Switch PID.
- Monitor the LCM multifunction switch status PID while placing the multifunction switch in the HIGH BEAM position.
- Does the multifunction switch PID agree with the switch position?
Yes : GO to A7.

No : GO to A3.
A3 BYPASS THE MULTIFUNCTION SWITCH
- Key in OFF position.
- Disconnect: Multifunction Switch C202c.
- Connect a fused (5A) jumper wire between the multifunction switch C202c-9, circuit 57 (BK), harness side and the multifunction switch C202c-10, circuit 12 (LG/BK), harness side.
  
  Fig 1: Bypassing The Multifunction Switch
  Courtesy of FORD MOTOR CO.
- Key in ON position.
- Place the headlamp switch in the HEADLAMPS ON position.
- Is the high beam indicator illuminated?
Yes : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES . CLEAR the DTCs. REPEAT the self-test.

No : REMOVE the jumper wire. GO to A4.
A4 CHECK CIRCUIT 12 (LG/BK) FOR AN OPEN
- Place the headlamp switch in the OFF position.
- Key in OFF position.
- Disconnect: LCM 2145d.
- Measure the resistance between the multifunction switch C202c-10, circuit 12 (LG/BK), harness side and the LCM C2145d-26, circuit 12 (LG/BK), harness side.
  
  Fig 2: Checking Circuit 12 (LG/BK) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to A8.

No : REPAIR the circuit. TEST the system for normal operation.
A5 CHECK CIRCUIT 57 (BK) FOR AN OPEN
- Key in OFF position.
- Disconnect: Multifunction Switch C202c.
- Measure the resistance between the multifunction switch C202c-9, circuit 57 (BK), harness side and ground.
  
  Fig 3: Measuring Resistance Between Multifunction Switch C202C-9, Circuit 57 (BK), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to A6.

No : REPAIR the circuit. TEST the system for normal operation.
A6 CHECK THE MULTIFUNCTION SWITCH
- Connect a fused (5A) jumper wire between the multifunction switch C202c-9, circuit 57 (BK), harness side and ground.
  
  Fig 4: Connecting Fused (5A) Jumper Wire Between Multifunction Switch C202C-9, Circuit 57 (BK), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Key in ON position.
- Place the headlamp switch in the HEADLAMPS ON position.
- Is the high beam indicator illuminated?
Yes : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES . TEST the system for normal operation.

No : REMOVE the jumper wire. GO to A8.
A7 CHECK CIRCUIT 910 (PK) FOR AN OPEN (TO LCM)
- Key in OFF position.
- Disconnect: LCM C2145c.
- Measure the voltage between the LCM C2145c-1, circuit 910 (PK), harness side and ground.
  
  Fig 5: Measuring Voltage Between LCM C2145C-1, Circuit 910 (PK), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes : GO to A8.

No : VERIFY the CJB fuse 23 (15A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
A8 CHECK FOR CORRECT LCM OPERATION
- Key in OFF position.
- Disconnect all the LCM connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all the LCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes : INSTALL a new LCM. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.

No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.