Pinpoint Test AD: DTC U0126

Adaptive Headlighting


Pinpoint Tests

Pinpoint Test AD: DTC U0126

Normal Operation

The Headlamp Control Module (HCM) receives steering wheel angle information from the Steering Angle Sensor Module (SASM). If the HCM does not receive communication from the SASM, DTC U0126 is set.

This pinpoint test is intended to diagnose the following:

- HCM
- SASM



PINPOINT TEST AD: DTC U0126

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AD1 REPEAT THE HCM SELF-TEST


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: HCM Self-Test.
- Clear the DTCs and repeat the HCM self-test.
- Is DTC U0126 retrieved again?

Yes
GO to AD2.

No
The vehicle is operating correctly at this time. The HCM may have temporarily lost communication with the SASM.

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AD2 CHECK THE ABS MODULE FOR DTC U0126


- Enter the following diagnostic mode on the scan tool: ABS Module Self-Test.
- Carry out the self-test for the ABS module.
- Is DTC U0126 retrieved?

Yes
REFER to Information Bus.

No
GO to AD3.

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AD3 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) Service and Repair. 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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