Pinpoint Test AD: DTC B103C:11, 15

Adaptive Headlighting

Pinpoint Tests

Pinpoint Test AD: DTC B103C:11, 15

Normal Operation
- B103C:11 (Left Headlamp Control: Circuit Short To Ground) - sets when the Headlamp Control Module (HCM) detects a short to ground from any of the LH headlamp swivel circuits CLF50 (BN/VT), CLF51 (GY), CLF52 (WH) or CLF53 (BN/WH).
- B103C:15 (Left Headlamp Control: Circuit Short To Battery or Open) - sets when the HCM detects an open or short to voltage from any of the LH headlamp swivel circuits CLF50 (BN/VT), CLF51 (GY), CLF52 (WH) or CLF53 (BN/WH).

There are 4 circuits the HCM uses to monitor and actuate the stepper motors within the LH headlamp assembly. If the HCM detects a concern with any of these circuits, the HCM returns the RH headlamp to the center position and disables the adaptive headlamp functionality.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- LH headlamp assembly
- HCM



PINPOINT TEST AD: DTC B103C:11, 15

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AD1 CHECK THE SWIVEL MOTOR AND SENSOR CIRCUITS FOR A SHORT TO GROUND


- Ignition OFF.
- Disconnect: HCM C1600.
- Measure the resistance between the HCM, harness side and ground as follows:









- Are the resistances greater than 10,000 ohms?

Yes
GO to AD3.

No
GO to AD2.

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AD2 ISOLATE THE SWIVEL MOTOR AND SENSOR CIRCUITS FOR A SHORT TO GROUND


- Disconnect: LH Headlamp C1021.
- Measure the resistance between the HCM, harness side and ground as follows:









- Are the resistances greater than 10,000 ohms?

Yes
INSTALL a new LH headlamp assembly. REFER to Headlamp Assembly Service and Repair. CLEAR the DTCs. REPEAT the self-test.

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

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AD3 CHECK THE SWIVEL MOTOR AND SENSOR CIRCUITS FOR A SHORT TO EACH OTHER


- Disconnect: LH Headlamp C1021.
- Measure the resistance between the HCM pins, harness side and ground as follows:





- Are the resistances greater than 10,000 ohms?

Yes
GO to AD4.

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

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AD4 CHECK THE SWIVEL MOTOR AND SENSOR CIRCUITS FOR AN OPEN


- Measure the resistance between the HCM, harness side and the LH headlamp, harness side as follows:









- Are the resistances less than 5 ohms?

Yes
INSTALL a new LH headlamp assembly. REFER to Headlamp Assembly Service and Repair. CLEAR the DTCs. REPEAT the self-test.

If the DTC returns, GO to AD5.

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

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AD5 CHECK FOR CORRECT HCM OPERATION


- Disconnect the HCM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the HCM connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new HCM. REFER to Headlamp Control Module (HCM) 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.

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