Pinpoint Test Aa: The Individual Trailer Lamp Is Inoperative - LH Trailer Turn Signal/STOPLAMP/Hazard Flasher Lamp
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.
- AA1 CHECK TURN SIGNAL OPERATION
- Key in OFF position.
- Disconnect: Trailer Tow C4098 (4-pin).
- Disconnect: Trailer Tow C4099 (7-pin).
- Disconnect the trailer from the vehicle.
- Check the operation of the vehicle exterior lighting systems for any concerns.
- Does the exterior lighting system of the vehicle operate correctly?
- Yes : GO to AA2.
- No : REPAIR any vehicle exterior lighting concerns. TEST the system for normal operation.
- AA2 CHECK CIRCUIT 64 (DG) FOR POWER
- Key in ON position.
- Place the multifunction switch in the LH turn position.
- Measure the voltage between trailer tow C4098-3, circuit 52 (YE) (4-pin connector), or the trailer tow C4099-1, circuit 52 (YE) (7-pin connector), harness side and ground.
- Does the voltage alternate between less than 1 volt and greater than 10 volts?
- Yes : The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair center.
- No : GO to AA3.
- AA3 CHECK THE TRAILER LH TURN RELAY
- Key in OFF position.
- Disconnect: Trailer LH Turn Relay.
- Carry out the trailer LH turn relay component test. Refer to COMPONENT TESTING .
- Is the trailer LH turn relay OK?
- Yes
: If equipped with 6.0L diesel, GO to AA7.
All others, GO to AA4.
- No : INSTALL a new trailer LH turn relay. TEST the system for normal operation.
- AA4 CHECK THE INPUT FROM THE MULTIFUNCTION SWITCH
- Key in ON position.
- Measure the voltage between trailer LH turn relay pin 1, circuit 9 (LG/OG), harness side and ground.
- Does the voltage alternate between less than 1 volt and greater than 10 volts?
- Yes : GO to AA5.
- No : REPAIR circuit 9 (LG/OG). TEST the system for normal operation.
- AA5 CHECK VOLTAGE TO THE TRAILER LH TURN/STOP RELAY
- Key in ON position.
- Measure the voltage between trailer LH turn relay pin 3, circuit 1362 (DG/OG), harness side and ground.
- Is the voltage greater than 10 volts?
- Yes : GO to AA6.
- No : REPAIR circuit 1362 (DG/OG). TEST the system for normal operation.
- AA6 CHECK THE TRAILER LH TURN RELAY GROUND
- Measure the resistance between trailer RH turn relay pin 2, circuit 57 (BK), harness side and ground.
- Is the resistance less then 5 ohms?
- Yes : REPAIR circuit 52 (YE). TEST the system for normal operation.
- No : REPAIR circuit 57 (BK). TEST the system for normal operation.
- AA7 CHECK CIRCUIT 9 (LG/OG) FOR AN OPEN
- Key in ON position.
- Measure the voltage between trailer LH turn relay pin 86, circuit 9 (LG/OG), harness side and ground.
- Does the voltage alternate between less than 1 volt and greater than 10 volts?
- Yes : GO to AA8.
- No : REPAIR the circuit. TEST the system for normal operation.
- AA8 CHECK CIRCUIT 1362 (DG/OG) FOR AN OPEN
- Key in OFF position.
- Measure the voltage between trailer LH turn relay pin 30, circuit 1362 (DG/OG), harness side and ground.
- Is the voltage greater than 10 volts?
- Yes : GO to AA9.
- No : REPAIR the circuit. TEST the system for normal operation.
- AA9 CHECK THE TRAILER LH TURN RELAY GROUND (6.0L DIESEL)
- Measure the resistance between trailer LH turn relay pin 85, circuit 57 (BK), harness side and ground.
- Is the resistance less than 5 ohms?
- Yes : REPAIR circuit 52 (YE). TEST the system for normal operation.
- No : REPAIR circuit 57 (BK). TEST the system for normal operation.