Pinpoint Test K: The Turn Signal Lamps Are Inoperative
WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
- K1 CHECK FOR CORRECT HIGH BEAM OPERATION
- Place the headlamp switch in the HEADLAMPS ON position.
- Place the multifunction switch in the HIGH BEAM position while observing the high beam headlamps.
- Do the high beams operate correctly?
- K2 CHECK THE MULTIFUNCTION SWITCH
- Key in OFF position.
- Disconnect: Multifunction Switch C202
- Carry out the multifunction switch component test. Refer to appropriate COMPONENT TESTING article.
- Is the multifunction switch OK?
- YES : Go to K3.
- NO : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES article. TEST the system for normal operation.
- K3 CHECK CIRCUIT CLS20 (BN/BU) (LH TURN SIGNAL) OR CLS24 (BN/WH) (RH TURN SIGNAL) FOR AN OPEN
- Disconnect: SJB C2280b
- Measure the resistance between the multifunction switch C202-2 (LH turn lamps), circuit CLS20 (BN/BU), harness side and the SJB C2280b-42, circuit CLS20 (BN/BU), harness side; or between the multifunction switch C202-3 (RH turn lamps), circuit CLS24 (BN/WH), harness side and the SJB C2280b-29, circuit CLS24 (BN/WH), harness side.
- Is the resistance less than 5 ohms?
- YES : Go to K4.
- NO : REPAIR the circuit in question. TEST the system for normal operation.
- K4 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 article. 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.