Pinpoint Test N: The Turn Signal Lamps Are Always On

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

N1 DETERMINE THE ALWAYS ON TURN LAMPS
- Key in ON position.
- Make sure the multifunction switch is in the NEUTRAL position and observe the turn lamps.
- Are any turn lamps flashing on and off?
Yes: GO to N2.

No: GO to N4.
N2 CHECK THE MULTIFUNCTION SWITCH
- Key in OFF position.
- Disconnect: Multifunction Switch 22080.
- Key in ON position.
- Do the turn lamps continue to flash on and off?
Yes: GO to N3.

No: INSTALL a new multifunction switch. REFER to STEERING COLUMN MULTIFUNCTION SWITCH . CLEAR the DTCs. REPEAT the self-test.
N3 CHECK CIRCUIT 1690 (LB/RD) OR CIRCUIT 1691 (LG/OG) FOR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: SJB C2280e.
- Measure the resistance between the multifunction switch C2080-8, circuit 1690 (LB/RD) (LH turn lamps), harness side and ground; or between the multifunction switch C2080-6, circuit 1691 (LG/OG) (RH turn lamps), harness side and ground.
  
  Fig 1: Checking Circuit 1690 (LB/RD) Or Circuit 1691 (LG/OG) For A Short To Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
Yes: GO to N5.

No: REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
N4 CHECK CIRCUIT 3 (LG/WH) (LH TURN LAMP) OR CIRCUIT 2 (WH/LB) (RH TURN LAMP) FOR A SHORT TO VOLTAGE
- Key in OFF position.
- Disconnect: SJB C2280c (Rear Turn Lamp).
- Disconnect: SJB C2280b (Front Turn Lamp).
- Key in ON position.
- Does the turn lamp continue to illuminate?
Yes: REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

No: GO to N5.
N5 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 SMART JUNCTION BOX (SJB) . 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. CLEAR the DTCs. REPEAT the self-test.