Pinpoint Test P: The LH Turn Indicator Is Never On

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

P1 VERIFY TURN SIGNAL OPERATION
- Verify the LH turn signal operation.
- Does the LH turn signal operate correctly?
- Yes : GO to P2.
- No : REFER to EXTERIOR LIGHTING to continue diagnosis of the turn signals.
P2 CHECK CIRCUIT 3 (LG/WH) FOR VOLTAGE
- Disconnect: Instrument Cluster C220a.
- Key in ON position.
- Place the multifunction switch in the LH turn signal position.
- Measure the voltage between the instrument cluster C220a-1, circuit 3 (LG/WH), harness side and ground.
  
  Fig 1: Checking Circuit 3 (LG/WH) For Voltage
  Courtesy of FORD MOTOR CO.
- Does the voltage fluctuate between 0 and greater than 10 volts?
- Yes : GO to P3.
- No : REPAIR the circuit. TEST the system for normal operation.
P3 CHECK CIRCUIT 57 (BK) FOR AN OPEN
- Key in OFF position.
- Measure the resistance between the instrument cluster C220a-10, circuit 57 (BK), harness side and ground.
  
  Fig 2: Checking Circuit 57 (BK) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to P4.
- No : REPAIR the circuit. TEST the system for normal operation.
P4 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Disconnect all the instrument cluster connectors.
- Check for:
  - corrosion
  - 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?
- Yes : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . 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.