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 Descriptors
DTC B2530 02: Front Fog Lamps Control Circuit Short to GroundDTC B2530 05: Front Fog Lamps Control Circuit Short to Battery or Open
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Front Fog Lamp Switch Signal | 2 | 2 | 2 | -- |
Front Fog Lamp Relay Control | B2530 02 | B2530 05 | B2530 05 | -- |
Front Fog Lamp Control | 1 | 1 | 1 | -- |
Front Fog Lamp Switch Indicator Control | B2530 02 | B2530 05 | B2530 05 | -- |
Fog Lamp - LF Ground | -- | 1 | -- | -- |
Fog Lamp - RF Ground | -- | 1 | -- | -- |
Fog Lamp Switch Ground | -- | 2 | -- | -- |
1. Front Fog Lamps Malfunction 2. Front Fog Lamp Switch Malfunction | ||||
Circuit/System Description
The front fog lamp relay is supplied with battery voltage at all times via the FRT FOG LP fuse. 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 voltage 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 FRT FOG LP fuse to the front fog lamp control circuit which illuminates the front fog lamps. The front fog lamp relay control circuit also controls the front fog lamp switch indicator.
Conditions for Running the DTC
| • | Battery voltage must be between 9-16 volts. |
| • | Front fog lamps ON. |
Conditions for Setting the DTC
B2530 02
The DTC will set when the BCM detects a short to ground in the front fog lamp relay control circuit for 5 seconds or greater.
B2530 05
The DTC will set when the BCM detects a short to voltage or an open in the front fog lamp relay control circuit for 5 seconds or greater.
Actions Taken When the DTC Sets
B2530 02
When the DTC is present, the front fog lamps will not operate when the park lamps are ON and the front fog lamp switch is active.
B2530 05
When the DTC is present, for a short to voltage condition the front fog lamps and the front fog lamp switch indicator will be on at all times when the park lamps are OFF and the front fog lamp switch is inactive. For an open condition, the front fog lamps and the front fog lamp switch indicator 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 front fog lamp relay.
- Ignition OFF, exterior lamps OFF, test for less than 5 ohms between the ground circuit terminal 86 and ground.
- Connect a test lamp between the control circuit terminal 85 and ground.
- 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, test or replace the front fog lamp relay.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to ground 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 |
