Pinpoint Test L: The Turn Signal Function Is Always On

Turn Signal and Hazard Lamps

Pinpoint Test L: The Turn Signal Function Is Always On

Refer to Wiring Diagram Set 90, Turn Signal/Stop/Hazard Lamps for schematic and connector information Electrical Diagrams.

Normal Operation

The Body Control Module (BCM) sends voltage signals to the multifunction switch to monitor the LH and RH turn input circuits. The voltage signal is routed to ground when the multifunction switch is placed in the LH or RH TURN position. When the BCM (Body Control Module) detects the multifunction switch is in the LH or RH TURN position, the BCM (Body Control Module) sends voltage to the appropriate turn lamps.

- DTC B1D36:92 (Turn Indicator Switch: Performance Or Incorrect Operation)- a continuous and on-demand DTC that sets when the BCM (Body Control Module) detects a short to ground from the LH and/or the RH turn signal switch input.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Multifunction switch

- BCM (Body Control Module)

PINPOINT TEST L : THE TURN SIGNAL FUNCTION IS ALWAYS ON

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

L1 CHECK THE MULTIFUNCTION SWITCH

- Ignition OFF.

- Disconnect: Multifunction Switch C202A.

- Ignition ON.

Do the turn lamps continue to flash on and off?

Yes
GO to L2.

No
INSTALL a new multifunction switch. TEST the system for normal operation.

L2 CHECK THE TURN LAMP REQUEST INPUT CIRCUIT FOR A SHORT TO GROUND

- Ignition OFF.

- Disconnect: BCM (Body Control Module) C2280E.

- Measure the resistance between the multifunction switch C202A-4 (LH turn lamps), circuit CLS39 (VT/WH), harness side and ground; or between the multifunction switch C202A-8 (RH turn lamps), circuit CLS41 (GY/YE), harness side and ground.





Is the resistance greater than 10,000 ohms?

Yes
GO to L3.

No
REPAIR circuit CLS39 (VT/WH) (LH turn) or circuit CLS41 (GY/YE) (RH turn) for a short to ground. TEST the system for normal operation.

L3 CHECK FOR CORRECT BCM (Body Control Module) OPERATION

- Disconnect all the BCM (Body Control Module) connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all the BCM (Body Control Module) 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 BCM (Body Control Module). 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.