Pinpoint Test N: The Turn Signal Lamps Are Always On

Turn Signal and Hazard Lamps

Pinpoint Tests

Pinpoint Test N: The Turn Signal Lamps Are Always On

Refer to Wiring Diagram Set 90 (Fusion/Milan/MKZ, Fusion Hybrid/Milan 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. When the multifunction switch is switched to the LH or RH TURN positions, the voltage signal is switched 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.

- 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 switch input circuit.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Multifunction switch
- SJB



PINPOINT TEST N: 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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N1 CHECK THE MULTIFUNCTION SWITCH


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

Yes
GO to N2.

No
INSTALL a new multifunction switch. REFER to Steering Column. CLEAR the DTCs. REPEAT the self-test.

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N2 CHECK THE TURN SIGNAL REQUEST INPUT CIRCUIT FOR A SHORT TO GROUND


- Ignition OFF.
- Disconnect: SJB C2280b.
- Measure the resistance between the multifunction switch C202-2, (LH turn lamps), circuit CLS39 (VT/WH), harness side and ground; or between the multifunction switch C202-3, (RH turn lamps), circuit CLS41 (GY/YE), harness side and ground.




- Is the resistance greater than 10,000 ohms?

Yes
GO to N3.

No
REPAIR circuit CLS39 (VT/WH) (LH turn signal) or circuit CLS41 (GY/YE) (RH turn signal) for a short to ground. CLEAR the DTCs. REPEAT the self-test.

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N3 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 Body Control Systems. 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 any DTCs. REPEAT the self-test.

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