Pinpoint Test K: The Turn Signal Lamps Are Always On

Turn Signal and Hazard Lamps

Pinpoint Tests

Pinpoint Test K: The Turn Signal Lamps Are Always On

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.

- DTC B2281 (Right Turn Switch Short to Ground) - an on-demand DTC that sets when the SJB detects a short to ground from the RH turn signal input circuit.
- DTC B2282 (Left Turn Switch Short to Ground) - an on-demand DTC that sets when the SJB detects a short to ground from the LH turn signal input circuit.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Multifunction switch
- SJB



PINPOINT TEST K: THE TURN SIGNAL LAMPS ARE ALWAYS ON

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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K1 CHECK THE MULTIFUNCTION SWITCH


- Ignition OFF.
- Disconnect: Multifunction Switch C202.
- Ignition ON.
- Do the turn signal lamps continue to flash on and off?

Yes
GO to K2.

No
INSTALL a new multifunction switch. CLEAR the DTCs. REPEAT the self-test.

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K2 CHECK CIRCUIT 1393 (LB/RD) OR CIRCUIT 1392 (LG/OG) FOR A SHORT TO GROUND


- Ignition OFF.
- Disconnect: SJB C2280b.
- Measure the resistance between the multifunction switch C202-6 (LH turn signal), circuit 1393 (LB/RD), harness side and ground; and between the multifunction switch C202-7 (RH turn signal), circuit 1392 (LG/OG), harness side and ground.




- Is the resistance greater than 10,000 ohms?

Yes
GO to K3.

No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

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K3 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. CLEAR the DTCs. REPEAT the self-test.

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