Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC B2527 00: Front Fog Lamps Circuit LowDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Front Fog Lamp Relay B+ | B2530 00 | B2530 00 | -- | -- |
Front Fog Lamp Control | 1 | 1 | 1 | -- |
Front Fog Lamp Switch Signal | B2527 00 | 2 | 2 | -- |
Front Fog Lamp Relay and Indicator Control | B2530 00 | B2530 00 | B2530 00 | -- |
Front Fog Lamp Ground | -- | 1 | -- | -- |
Headlamp Switch Ground | -- | 4 | -- | -- |
1. Fog Lamp Malfunction 2. Fog Lamp Switch Malfunction | ||||
Circuit/System Description
The front fog lamp relay coil is supplied with battery voltage when the ignition is in the RUN or CRANK position. The front fog lamp relay switch is supplied with battery voltage at all times. The front fog lamp switch signal circuit is grounded momentarily by pressing the front fog lamp switch. The body control module (BCM) energizes the front fog lamp relay by applying ground to the front fog lamp relay control circuit. When the front fog lamp relay is energized, the relay switch contacts close and battery voltage is applied through the FRONT FOG fuse to the front fog lamp control circuit which illuminates the front fog lamps.
Conditions for Running the DTC
The battery voltage must be between 9-16 volts.
Fog Lamps must be commanded ON.
Conditions for Setting the DTC
The front fog lamp switch signal circuit is shorted to ground for 15 minutes.
Action Taken When the DTC Sets
The front fog lamps will be inoperative.
Conditions for Clearing the 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. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Exterior Lighting Systems Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Ignition OFF, disconnect the harness connector X2 at the headlamp switch.
- Ignition ON, verify the scan tool front fog lamp switch parameter is OFF.
- If all circuits test normal, test or replace the headlamp switch.
| ⇒ | If not the specified value test the front fog lamp switch signal circuit for a short to ground. If the circuit tests normal, replace the BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, programming, and setup. |
