• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Fog Lamp Switch Signal | 2 | 2 | 2 | -- |
Fog Lamp Relay Control | B2530 02 | B2530 05 | B2530 05 | -- |
Fog Lamp Control | 1 | 1 | 1 | -- |
Fog Lamp - LF Ground | -- | 1 | -- | -- |
Fog Lamp - RF Ground | -- | 1 | -- | -- |
Fog Lamp Relay Ground | -- | 1 | -- | -- |
Fog Lamp Switch Ground | -- | 2 | -- | -- |
1. Fog Lamps Malfunction 2. Fog Lamp Switch Malfunction |
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 voltage 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 LAMP fuse to the fog lamp control circuit which illuminates the fog lamps.
• | Battery voltage must be between 9-16 volts. |
• | Fog lamps ON. |
The DTC will set when the BCM detects a short to ground in the fog lamp relay control circuit for 5 seconds or greater.
The DTC will set when the BCM detects a short to voltage or an open in the fog lamp relay control circuit for 5 seconds or greater.
When the DTC is present, the fog lamps will not operate when the park lamps are ON and the fog lamp switch is active.
When the DTC is present, for a short to voltage condition the fog lamps and the fog lamp switch indicator will be on at all times when the park lamps are OFF and the fog lamp switch is inactive. For an open condition, the fog lamps and the fog lamp switch indicator will not operate when the park lamps are ON and the fog lamp switch is active.
• | The condition responsible for setting the DTC no longer exists. |
• | A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred. |
Exterior Lighting Systems Description and Operation
Control Module References for scan tool information
⇒ | 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. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM replacement, setup, and programming |