Pinpoint Test M: The Turn Signal Lamps Are Always On
WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
- M1 CHECK THE MULTIFUNCTION SWITCH
- Ignition OFF.
- Disconnect: Multifunction Switch C202.
- Ignition ON.
- Do the turn lamps continue to flash on and off?
- Yes: GO to M2 .
- No: INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES . TEST the system for normal operation.
- M2 CHECK THE TURN LAMP REQUEST INPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: SJB C2280b.
- Measure the resistance between the multifunction switch C202-2 (LH turn lamps), circuit CLS20 (BN/BU), harness side and ground; or between the multifunction switch C202-3 (RH turn lamps), circuit CLS24 (BN/WH), harness side and ground.
- Is the resistance greater than 10,000 ohms?
- Yes: GO to M3 .
- No: REPAIR the circuit in question for a short to ground. TEST the system for normal operation.
- M3 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- 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.