Pinpoint Test L: The LH Turn Signal Indicator Is Never 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.

L1 CHECK LH TURN SIGNAL OPERATION
- Key in ON position.
- Operate the LH turn signal.
- Does the LH external turn signal operate?
1. Yes : GO to L2.
2. No : REFER to EXTERIOR LIGHTING to continue diagnosis of the turn signals.
L2 CHECK THE POWER TO THE INSTRUMENT CLUSTER
- Key in OFF position.
- 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 pin 12, circuit 3 (LG/WH), harness side and ground.
  
  Fig 1: Checking Power To Instrument Cluster
  Courtesy of FORD MOTOR CO.
- Does the voltage vary from 0 to greater than 10 volts?
1. Yes : GO to L3.
2. No : REPAIR the circuit. TEST the system for normal operation.
L3 CHECK THE GROUND TO THE INSTRUMENT CLUSTER
- Key in OFF position.
- Measure the resistance between the instrument cluster C220a pin 1, circuit 57 (BK), harness side and ground.
  
  Fig 2: Checking Ground To Instrument Cluster
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
1. Yes : GO to L4.
2. No : REPAIR the circuit. TEST the system for nor
L4 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Disconnect all instrument cluster connectors.
- Check for:
- Corrosion
- Pushed-out pins
- Incorrectly installed bulb sockets
- Burnt-out bulbs
- 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. REPEAT the instrument cluster 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.