Pinpoint Test Q: The LH Turn Indicator Is Never On
- Q1 VERIFY TURN SIGNAL OPERATION
- Verify the LH turn signal operation.
- Does the LH turn signal operate correctly?
- Yes
: GO to Q2.
- No
: REFER to EXTERIOR LIGHTING
to continue diagnosis of the turn signals.
- Q2 CHECK CIRCUIT 3 (LG/WH) FOR VOLTAGE
- Key in OFF position.
- Disconnect: Instrument Cluster C220b.
- Key in ON position.
- Place the multifunction switch in the LH turn signal position.
- Measure the voltage between the instrument cluster C220b pin 8, circuit 3 (LG/WH), harness side and ground.
Courtesy of FORD MOTOR CO.
- Does the voltage fluctuate between 0 and greater than 10 volts?
- Yes
: GO to Q3.
- No
: REPAIR the circuit. TEST the system for normal operation.
- Q3 CHECK CIRCUIT 57 (BK) (EXPEDITION) OR CIRCUIT 676 (PK/OG) (NAVIGATOR) FOR AN OPEN
- For Expedition, measure the resistance between the instrument cluster C220a pin 10, circuit 57 (BK), harness side and ground.
Courtesy of FORD MOTOR CO.
- For Navigator, measure the resistance between the instrument cluster C220a pin 9, circuit 676 (PK/OG), harness side and ground; and between the instrument cluster C220a pin 22, circuit 676 (PK/OG), harness side and ground.
Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes
: GO to Q4.
- No
: REPAIR the circuit. TEST the system for normal operation.
- Q4 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.