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 Lamps Control CircuitDiagnostic 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.
Conditions for Setting the DTC
| • | When the BCM receives a front fog lamp switch OFF command and the front fog lamp relay control circuit is shorted to ground or has an open/high resistance. |
| • | When the BCM receives a front fog lamp switch ON command and the front fog lamp relay control circuit is shorted to voltage. |
Action Taken When the DTC Sets
The front fog lamps will be inoperative or always ON.
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 front fog lamp relay.
- Ignition ON, verify that a test lamp does not illuminate between the front fog lamp control circuit terminal 87 and ground.
- Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
- Verify that a test lamp illuminates between the B+ circuit terminal 85 and ground.
- Disconnect the harness connector at the inoperative front fog lamp.
- Test for less than 5.0 ohms between the front fog lamp ground circuit terminal B and ground.
- Connect a test lamp between the control circuit terminal A and ground.
- Ignition OFF, connect a 15A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the test lamp illuminates.
- If all circuits test normal, replace the front fog lamp relay.
| ⇒ | If the test lamp illuminates, test the control circuit for a short to voltage. |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, and the B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground. |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for an open/high resistance. |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. |
| ⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM replacement, programming, and setup.
