For 1990-2009 cars

### Circuit Description

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 battery positive voltage to the front fog lamps relay control circuit when the front fog lamp relay is energized, battery positive voltage is applied to the front fog lamps supply voltage circuit which illuminates the front fog lamps.

### DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B2530 Front Fog Lamps Control Circuit

### Conditions for Running the DTC

The battery voltage must be between 9-16 volts.

### Conditions for Setting the DTC

#### B2530 02

The front fog lamp relay control circuit is shorted to ground.

#### B2530 05

The front fog lamp relay control circuit is shorted to battery positive voltage or open.

### Action Taken When the DTC Sets

#### B2530 02

The front fog lamps will not operate.

#### B2530 05

The front fog lamps and the fog lamp indicator will be on at all times or will not operate.

The front fog lamps will not operate or will remain 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.

• | History and current DTCs can be cleared using a scan tool.

### Diagnostic Aids

• | The fog lamps will only illuminate under the following conditions:

- | The park lamps or low beam headlamps are ON.

- | The high beam 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 .

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Fog Lights Schematics Connector End View Reference: Master Electrical Component List
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 |

1. Turn ON the ignition.
2. Turn ON the park lamps.
3. Turn ON the front fog lamps.
4. Turn OFF the front fog lamps.

Do the front fog lamps turn ON and OFF?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3 | Is DTC B2530 02 present? | Go to Step 5 | Go to Step 4
4 | Are the fog lamps illuminated? | Go to Step 6 | Go to Step 7
5 | Test for a short to ground in the fog lamp relay control circuit. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 9
6 | Test for a short to battery positive voltage in the fog lamp relay control circuit. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 9
7 | Test for an open or high resistance in the fog lamp relay control circuit. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 8
8 | Test for an open or high resistance in the control side ground circuit of the fog lamp relay. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 10
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 | Inspect for poor connections at the harness connector of the underhood fuse block. 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
11 | Replace the underhood fuse block. Refer to Underhood Electrical Center or Junction Block Bracket Replacement . 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 |

1. Use a scan tool in order to clear the DTCs.
2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK