Circuit Description
The fog lamp relay is controlled by the body control module (BCM). The BCM grounds the fog lamp relay control circuit in order to turn ON the fog lamp relay. When the fog lamp relay control circuit opens or becomes shorted to ground without being commanded ON by the BCM, DTC B2532 is set.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B2532 Front Fog Lamps Control Circuit Low
Conditions for Running the DTC
| • | The ignition switch is in the ON position. |
| • | The headlamp switch is in the HEAD or PARK position. |
Conditions for Setting the DTC
| • | The ignition switch is in the ON position. |
| • | The headlamp switch is the HEAD or PARK position. |
| • | The fog lamp relay control circuit is open or shorted to ground for 5 seconds. |
Action Taken When the DTC Sets
| • | DTC B2532 is stored in the BCM memory. |
| • | If the fog lamp relay control circuit is shorted to ground, the fog lamps are always ON when the headlamps or park lamps are ON. |
| • | If the fog lamp relay control circuit is open, the fog lamps are inoperative. |
Conditions for Clearing the DTC
| • | The conditions for setting the DTC are no longer present. |
| • | A history DTC clears after 100 malfunction-free ignition cycles. |
| • | The BCM receives the clear code command from the scan tool. |
Diagnostic Aids
| • | The fog lamps will only illuminate under the following conditions: |
| - | The park lamps or low beam headlamps are ON. |
| - | The highbeam headlamps are OFF. |
| - | The fog lamp switch is the ON position. |
| • | If the DTC is a history DTC, the problem may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections . |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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Listen for an audible click when the fog lamp relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
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This step tests for voltage at the coil side of the fog lamp relay.
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This step verifies that the BCM is providing ground to the fog lamp relay.
-
This step tests if ground is constantly being applied to the fog lamp relay.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Fog Lights Schematics | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
Does the fog lamp relay state change with each command? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 | |
Does the test lamp illuminate? | Go to Step 4 | Go to Step 10 | |
Does the test lamp turn ON and OFF with each command? | Go to Step 8 | Go to Step 5 | |
Does the test lamp remain illuminated with each command? | Go to Step 7 | Go to Step 6 | |
6 | Test the control circuit of the fog lamp relay for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 9 |
7 | Test the control circuit of the fog lamp relay for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 9 |
8 | Inspect for poor connections at the fog lamp relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 11 |
9 | Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 12 |
10 | Repair the open in the coil side battery positive voltage circuit of the fog lamp relay. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 13 | -- |
11 | Replace the fog lamp relay. Did you complete the replacement? | Go to Step 13 | -- |
12 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 13 | -- |
13 |
Does the DTC reset? | Go to Step 2 | System OK |
