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 B2530 00: Front Fog Lamp Control CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Fog Lamp Switch Signal | 2 | 2 | 2 | -- |
Fog Lamp Relay Control | 1 | 1 | B2530 00 | -- |
Fog Lamp Control | 1 | 1 | 1 | -- |
Fog Lamp - LF Ground | -- | 1 | -- | -- |
Fog Lamp - RF Ground | -- | 1 | -- | -- |
Headlamp Switch Ground | -- | 2 | -- | -- |
1. Front Fog Lamps Malfunction 2. Front Fog Lamp Switch Malfunction | ||||
Circuit/System Description
The fog lamp relay is supplied with battery voltage at all times. The fog lamp switch signal circuit is grounded momentarily by pressing the fog lamp switch. The body control module (BCM) energizes the fog lamp relay by applying ground to the fog lamp relay control circuit. When the fog lamp relay is energized, the relay switch contacts close and battery voltage is applied through the FOG LAMPS fuse to the fog lamp supply voltage circuit which illuminates the fog lamps.
Conditions for Running the DTC
| • | Battery voltage must be between 9-16 volts. |
| • | Fog lamps ON. |
Conditions for Setting the DTC
The BCM detects a short to voltage in the fog lamp relay control circuit.
Actions Taken When the DTC Sets
When the DTC is present, the fog lamps will not operate when the park lamps are ON and the front fog lamp switch is active.
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists. |
| • | A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred. |
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 X2 harness connector at the underhood fuse block.
- Connect a test lamp between B+ and the control circuit terminal H5.
- Command the Fog Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
- If all circuits test normal, replace the underhood fuse block.
| ⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. 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, setup, and programming |
