Pinpoint Test O: The LH Turn Signal Indicator Is Never On

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.

CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.

O1 CHECK THE LH TURN SIGNAL LAMPS
- Key in ON position.
- Operate the LH turn signal. Observe the LH turn signal lamps.
- Do the LH turn signal lamps operate correctly?
Yes : GO to O2.

No : REFER to EXTERIOR LIGHTING to continue diagnosis of the turn signal lamps.
O2 CHECK CIRCUIT 3 (LG/WH) FOR VOLTAGE
- Key in OFF position.
- Disconnect: Instrument Cluster C2220.
- Key in ON position.
- Operate the LH turn signal.
- Measure the voltage between the instrument cluster C2220-23, circuit 3 (LG/WH), harness side and ground.
  
  Fig 1: Measuring Voltage Between Instrument Cluster C2220-23, Circuit 3 (LG/WH), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Does the voltage alternate between 0 volts and greater than 10 volts?
Yes : GO to O3.

No : REPAIR the circuit. TEST the system for normal operation.
O3 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Disconnect the instrument cluster connector.
- Check for:
  - corrosion
  - pushed-out pins
- Connect the instrument cluster connector and make sure it seats 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.