B2575

DTC B2575

Circuit Description

When the BCM receives a ground signal from the headlamp switch requesting the low beam headlamps, the BCM will energize the HDM low beam relay by grounding the low beam relay control circuit.

Conditions for Running the DTC

- The battery voltage must be between 9.0-16.0 volts.

Conditions for Setting the DTC

- When the BCM receives a command to illuminate the low beam or DRL headlamps and the low beam relay control circuit is open or shorted to voltage.
- When the BCM does not receive a command to illuminate the low beam or DRL headlamps and the low beam relay control circuit is shorted to ground.

Action Taken When the DTC Sets

- The low beam and DRL headlamps will not operate or will remain always on.

Conditions for Clearing the MIL/DTC

- This DTC will clear on current status after the condition for setting the fault is corrected.
- A history DTC will clear after 100 consecutive ignition cycles without a fault present.
- History and current DTC(s) can be cleared using a scan tool.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

3. Tests for voltage at the voltage supply side of the HDM low beam relay.
4. Verifies that the body control module (BCM) is providing PWM ground to the HDM low beam relay.
5. Tests if ground is constantly being applied to the HDM low beam relay.
6. Tests if there is opposing voltage present or an open low beam relay control circuit.
12. After replacement of the BCM you must calibrate the new module for proper operation.