B3588

DTC B3588

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B3588 02
- Rear Fog Lamp Switch Circuit Short to Ground

Diagnostic Fault Information






Circuit/System Description

The auxiliary body control module (XBCM) receives a momentary ground signal from the rear fog lamp switch when the switch is activated. The rear fog lamps will remain illuminated until the switch is activated again or when the ignition key is cycled.

Conditions for Running the DTC

System voltage to the XBCM must be 9-16 volts.

Conditions for Setting the DTC

The rear fog lamp switch signal circuit is active for longer than 10 minutes.

Action Taken When the DTC Sets

The rear fog lamps will be disabled.

Conditions for Clearing the DTC

* The DTC will be current for as long as the fault is present.
* When the fault is no longer present, the DTC will be a history status code.
* A history DTC will clear after 50 ignition cycles or with a scan tool using the clear DTCs function.

System Verification

Use the scan tool output control for the Auxiliary Body Control Module to activate the rear fog lamps. The rear fog lamps should illuminate.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the rear fog lamp switch.
2. Ignition ON, verify that the Rear Fog Lamp Switch parameter displays Inactive.

^ If not the specified value, test the signal circuit terminal 6 for a short to ground. If the circuit tests normal, replace the XBCM.

3. Ignition OFF, connect the harness connector at the rear fog lamp switch.
4. Ignition ON, verify that the Rear Fog Lamp Switch parameter displays Inactive.

^ If not the specified value, replace the rear fog lamp switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Fog Lamp Switch Replacement