For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Strategy Based Diagnosis

• | Diagnostic Procedure Instructions

### DTC Descriptor

B2585 00: Left Park Lamp Control Circuit
B3867 00: Right Park Lamp Control Circuit

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Parklamp Control Circuit | B2585 00 B3867 00 | B2585 00 B3867 00 | B2585 00 B3867 00 | --
Headlamp Switch Parklamp Signal Circuit | 1 | 2 | -- | --
Headlamp Switch Parklamp Ground Circuit | -- | 2 | 2 | --
Headlamp Switch | 1 | 2 | 2 | --
1. Parklamp Always ON 2. Parklamp Inoperative

### Circuit/System Description

The body control module (BCM) controls the park lamp relay to ground the control circuit on the park lamp relay when the headlamp switch portion of the turn signal multifunction switch is turned to the PARK or the HEAD position. This energizes the park lamp relay, illuminating the park lamps. The park lamp relay is directly soldered to the underhood fuseblock circuit board. The replacement of the underhood fuseblock needs to be done to replace the park lamp relay.

### Diagnostic Aids

The parklamp relay is directly soldered to the underhood fuseblock circuit board. The replacement of the parklamp relay means replacing the underhood fuseblock.

A short to ground, a short to voltage or an open in the following location may cause a malfunction to occur:

• | The park lamp relay control circuit. The park lamp relay is located within the underhood fuseblock.

• | The park lamp relay

• | The headlamp switch (turn signal multifunction switch) supply circuit

• | The headlamp switch (turn signal multifunction switch) ground circuit

• | The turn signal multifunction switch which includes the headlamp switch

• | The BCM.

### Reference Information

#### Schematic Reference

Exterior Lights Schematics

#### Connector End View Reference

Lighting Systems Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

• | Scan Tool Data Definitions

• | Scan Tool Data List

• | Scan Tool Output Controls

### Circuit/System Verification

Ignition ON, turn the headlamps ON with the headlamp switch portion of the turn signal multifunction switch. Observe the park lamps, the park lamps should be ON.

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the inoperative park lamp.
2. Ignition OFF, test for less than 1.0 ohm of resistance between the ground circuit and ground.

⇒ | If greater than 1.0 ohm, test the ground circuit for an open/high resistance.

3. Install test lamp between the signal circuit and ground. Verify that the parklamps are ON.

⇒ | If the test lamp is not ON, test the signal circuit of the headlamp switch for a short to ground or an open/high resistance. If circuit tests normal, replace the BCM.

4. If all circuits test normal, test or replace the inoperative light bulb.

### Component Testing

1. Ignition OFF, disconnect the harness connector at the inoperative component.
2. Test for less than 5.0 ohms between the signal terminal and the voltage supply terminal.

⇒ | If greater than 5.0 ohms, replace the inoperative light bulb.

### Repair Instructions

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Control Module References for BCM replacement, setup, and programming

• | Front Side Marker Lamp Bulb Replacement

• | Tail Lamp Bulb Replacement

• | Park/Turn Signal Lamp Bulb Replacement

• | Underhood Electrical Center or Junction Block Replacement

• | Turn Signal Multifunction Switch Replacement