Pinpoint Test O: One Turn Signal Lamp Is Always On: Testing

WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.

O1 CHECK THE TURN LAMP VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE
- Key in OFF position.
- Disconnect: SJB C2280a (Front Lamp).
- Disconnect: SJB C2280e (Rear Lamp).
- Key in ON position.
- Does the turn lamp continue to illuminate?
- Yes : For the LH front turn lamp, REPAIR circuit 1342 (GY/BK). TEST the system for normal operation.
  For the RH front turn lamp, REPAIR circuit 1341 (DB/OG). TEST the system for normal operation.
  
  For the LH rear turn lamp, REPAIR circuit 1363 (WH/RD). TEST the system for normal operation.
  
  For the RH rear turn lamp, REPAIR circuit 1365 (GY/LB). TEST the system for normal operation.
- No : GO to O2.
O2 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all the SJB 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 SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . 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.