B2540

DTC B2540

Circuit Description
The rear fog lamp switch signal circuit is grounded momentarily by pressing the rear fog lamp switch. The BCM energizes the rear fog lamp relay by applying battery positive voltage to the rear fog lamp relay control circuit. When the rear fog lamp relay is energized, battery positive voltage is applied to the rear fog lamps supply voltage circuit which illuminates the rear fog lamp.

Conditions for Running the DTC
The battery voltage must be between 9.0-16.0 volts.

Conditions for Setting the DTC
^ DTC B2540 02 The rear fog lamp relay control circuit is shorted to ground.
^ DTC B2540 05 The rear fog lamp relay control circuit is shorted to battery positive voltage or open.

Action Taken When the DTC Sets
^ DTC B2540 02 rear fog lamps will not operate.
^ DTC B2540 05 rear fog lamps will be on at all times or will not operate.

Conditions for Clearing the DTC
^ 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 DTCs can be cleared using a scan tool.