Pinpoint Test J: The Turn Signal Lamps Are Inoperative
Turn Signal and Hazard Lamps
Pinpoint Tests
Pinpoint Test J: The Turn Signal Lamps Are Inoperative
Refer to Wiring Diagram Set 90, Turn Signal/Stop/Hazard Lamps for schematic and connector information. Diagrams By Number
Normal Operation
The Smart Junction Box (SJB) sends a voltage reference signal to the multifunction switch through circuit 1393 (LB/RD) (LH turn signal) and circuit 1392 (LG/OG) (RH turn signal). When the multifunction switch is placed in the LH or RH TURN position, the signal is routed through circuit 1396 (VT/WH) to an internal ground within the SJB.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Multifunction switch
- SJB
PINPOINT TEST J: 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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J1 CHECK THE HIGH BEAM OPERATION
- Ignition OFF.
- Place the headlamp switch in the HEADLAMPS ON position.
- Place the multifunction switch in the HIGH BEAM position.
- Do the high beams operate correctly?
Yes
GO to J2.
No
REFER to Headlamps Testing and Inspection.
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J2 CHECK THE MULTIFUNCTION SWITCH
- Place the headlamp switch in the OFF position.
- Disconnect: Multifunction Switch C202.
- Ignition ON.
- Connect a fused jumper wire between the multifunction switch C202-6 (LH turn signal), circuit 1393 (LB/RD) and the multifunction switch C202-10, circuit 1396 (VT/WH), harness side; or between the multifunction switch C202-7 (RH turn signal), circuit 1392 (LG/OG) and the multifunction switch C202-10, circuit 1396 (VT/WH), harness side.
- Does the LH or RH turn signal operate?
Yes
REMOVE the jumper wire. INSTALL a new multifunction switch. TEST the system for normal operation.
No
REMOVE the jumper wire. GO to J3.
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J3 CHECK CIRCUIT 1393 (LB/RD) OR CIRCUIT 1392 (LG/OG) FOR AN OPEN
- Ignition OFF.
- Disconnect: SJB C2280b.
- For an inoperative LH turn signal, measure the resistance between the multifunction switch C202-6, circuit 1393 (LB/RD) and the SJB C2280b-48, circuit 1393 (LB/RD), harness side.
- For an inoperative RH turn signal, measure the resistance between the multifunction switch C202-7, circuit 1392 (LG/OG) and the SJB C2280b-17, circuit 1392 (LG/OG), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to J4.
No
REPAIR the circuit in question. TEST the system for normal operation.
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J4 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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