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 B2532 00: Front Fog Lamps Control Circuit LowDTC B2533 00: Front Fog Lamps Control Circuit High
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 | B2532 00 | 1 | B2533 00 | -- |
Front Fog Lamp Control | 1 | 1 | 1 | -- |
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 ground at all times. The front fog lamp switch signal circuit is supplied by voltage 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 B+ is applied through the FRT FOG fuse to the front fog lamp supply voltage circuit which illuminates the front fog lamps.
Conditions for Running the DTC
| • | The battery voltage must be between 9-16 volts. |
| • | Front Fog Lamps must be ON |
Conditions for Setting the DTC
B2532
The DTC will set when the BCM detects a short to ground in the front fog lamp relay control circuit.
B2533
The DTC will set when the BCM detects a short to voltage in the front fog lamp relay control circuit.
Action Taken When the DTC Sets
The front fog lamps will either not operate at all or will remain on at all times.
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 Verification
Ignition ON, operate the front fog lamp switch ON and OFF and verify that the front fog lamps turn ON and OFF.
| ⇒ | If the front fog lamps do not turn ON, or remain always ON, perform the Front Fog Lamp Circuit System Test. |
Circuit/System Testing
- Ignition OFF, disconnect the front fog lamp relay.
- Connect a test lamp between the B+ circuit terminal 85 and the control circuit terminal 86.
- Igntion ON, command the front 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 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, programming, and setup |
