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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 voltage signals to the multifunction switch to monitor the LH and RH turn input. When the multifunction switch is switched to the LH or RH TURN position, the voltage signal is routed to ground. When the SJB detects the multifunction switch is in the LH or RH TURN position, the SJB sends voltage to the appropriate turn lamps.

The turn signal lamps and the rear stoplamps share the same voltage supply from the SJB fuse 6 (20A).

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 AND STOPLAMP 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.
- Apply and release the brake pedal while observing the stoplamps.
- Do the high beams and stoplamps operate correctly?

Yes
GO to L2.

No
REFER to Headlamps Special Tool(s) Used With Diagnostics or Stoplamps Special Tool(s) Used With Diagnostics.

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L2 BYPASS THE MULTIFUNCTION SWITCH

- Place the headlamp switch in the OFF position.
- 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. REFER to Steering Column Switches Steering Column Multifunction Switch. TEST the system for normal operation.

No
GO to L3.

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L3 CHECK THE TURN LAMP SIGNAL CIRCUIT 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 RH 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. REFER to Multifunction Electronic Modules Service and Repair. 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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