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BCM / B2540 05

Symptom: Rear fog lights not working.

  B2540 05


Rear Fog Light Button Circuit, Open/Short to B+

Fault symptom

Rear fog lights not working.

On-board diagnosis

Type of diagnosis:

Continuous

Enable criteria:

Ignition ON.

Fault criteria:

When voltage on output exceeds 10.2V.

Checking the wiring harness

Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.

Diagnostic help

Diagnosis regards:

Electrical fault in connecting leads or component.

Functions in the diagnostic tool related to the fault:

Test value:
Rear Fog Lights Switch
(See also description of readings/activations in diagnostic tool)