B1D64

Adaptive Headlighting

Pinpoint Test AB: DTC B1D64:87, B1D65:87

- DTC B1D64:87 (Left Headlamp Swivelling Motor: Missing Message)- sets continuous and on-demand in the Headlamp Control Module (HCM) if data messages from the LH headlamp are missing.

- DTC B1D65:87 (Right Headlamp Swivelling Motor: Missing Message)- sets continuous and on-demand in the HCM (Headlamp Control Module) if data messages from the RH headlamp are missing.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Headlamp assembly

- HCM (Headlamp Control Module)

PINPOINT TEST AB : DTC B1D64:87, B1D65:87

AB1 CHECK FOR VOLTAGE TO THE HEADLAMP

- Ignition OFF.

- Disconnect: LH Headlamp Assembly C1021 (DTC B1D64:87).

- Disconnect: RH Headlamp Assembly C1041 (DTC B1D65:87).

- Ignition ON.

- Measure the voltage between the LH headlamp C1021-5, circuit CBP42 (GN), harness side and ground; or between the RH headlamp C1041-5, circuit CBP42 (GN), harness side and ground.





Is the voltage greater than 10 volts?

Yes
GO to AB2.

No
REPAIR circuit CBP42 (GN) for an open. CLEAR the DTCs. REPEAT the self-test.

AB2 CHECK FOR VOLTAGE TO THE HEADLAMP USING THE CONNECTOR GROUND

- Measure the voltage between the LH headlamp C1021-5, circuit CBP42 (GN), harness side and the LH headlamp C1021-3, circuit GD121 (BK/YE), harness side; or between the RH headlamp C1041-5, circuit CBP42 (GN), harness side and the RH headlamp C1041-3, circuit GD123 (BK/GY), harness side.





Is the voltage greater than 10 volts?

Yes
GO to AB3.

No
REPAIR circuit GD121 (BK/YE) (LH headlamp) or circuit GD123 (BK/GY) (RH headlamp) for an open. CLEAR the DTCs. REPEAT the self-test.

AB3 CHECK THE COMMUNICATION CIRCUIT BETWEEN THE HCM (Headlamp Control Module) AND THE HEADLAMP FOR AN OPEN

- Ignition OFF.

- Disconnect: HCM (Headlamp Control Module) C1600.

- For the LH headlamp, measure the resistance between the HCM (Headlamp Control Module) C1600-17, circuit VLF32 (YE), harness side and the LH headlamp C1021-2, circuit VLF32 (YE), harness side.





- For the RH headlamp, measure the resistance between the HCM (Headlamp Control Module) C1600-18, circuit VLF33 (BU), harness side and the RH headlamp C1041-2, circuit VLF33 (BU), harness side.





Is the resistance less than 5 ohms?

Yes
GO to AB4.

No
REPAIR circuit VLF32 (YE) (LH headlamp) or circuit VLF33 (BU) (RH headlamp) for an open. CLEAR the DTCs. REPEAT the self-test.

AB4 CHECK FOR CORRECT HCM (Headlamp Control Module) OPERATION

- Disconnect all the HCM (Headlamp Control Module) connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all the HCM (Headlamp 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 HCM (Headlamp Control Module). REFER to Headlamp Control Module (HCM) . 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.