Pinpoint Test L: The Turn Signal Lamps Are Inoperative
Turn Signal and Hazard Lamps
Pinpoint Tests
Pinpoint Test L: The Turn Signal Lamps Are Inoperative
Refer to Wiring Diagram Set 90 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Turn Signal/Stop/Hazard Lamps for schematic and connector information. Diagrams By Number
Normal Operation
The Smart Junction Box (SJB) sends reference signals to the multifunction switch through circuit CLS20 (BN/BU) (LH turn input) and circuit CLS24 (BN/WH) (RH turn input). When the multifunction switch is switched to the LH or RH TURN positions, the voltage signal is routed to ground. When the SJB detects the multifunction switch in the LH or RH TURN position, the SJB sends voltage to the appropriate turn lamps.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Multifunction switch
- SJB
PINPOINT TEST L: THE TURN SIGNAL LAMPS ARE INOPERATIVE
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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L1 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?
Yes
PLACE the headlamp switch in the OFF position. GO to L2.
No
REFER to Headlamps Testing and Inspection.
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L2 CHECK THE MULTIFUNCTION SWITCH
- Ignition OFF.
- Disconnect: Multifunction Switch C202.
- For an inoperative LH turn signal, connect a fused jumper wire between the multifunction switch C202-2, circuit CLS20 (BN/BU), harness side and the multifunction switch C202-8, circuit GD114 (BK/BU), harness side.
- For an inoperative RH turn signal, connect a fused jumper wire between the multifunction switch C202-3, circuit CLS24 (BN/WH), harness side and the multifunction switch C202-8, circuit GD114 (BK/BU), harness side.
- Ignition ON.
- Do the turn signals in question flash on and off?
Yes
INSTALL a new multifunction switch. TEST the system for normal operation.
No
GO to L3.
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L3 CHECK CIRCUIT CLS20 (BN/BU) (LH TURN SIGNAL) OR CLS24 (BN/WH) (RH TURN SIGNAL) FOR AN OPEN
- Disconnect: SJB C2280b.
- For the LH turn signal, measure the resistance between the multifunction switch C202-2, circuit CLS20 (BN/BU), harness side and the SJB C2280b-42, circuit CLS20 (BN/BU), harness side.
- For the LH turn signal, measure the resistance between the multifunction switch C202-3, 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 L4.
No
REPAIR the circuit in question for an open. TEST the system for normal operation.
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L4 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. 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.
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