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 B3802 00: Park Lamps Request CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Parklamp Relay B+ | 1 | 1 | -- | -- |
Parklamp Switch Signal | 2 | 2 | 2 | -- |
Parklamp Control | 1 | 1 | 1 | -- |
Parklamp Relay Control | 1 | 1 | 1 | -- |
Parklamp Ground | -- | 1 | -- | -- |
Headlamp Switch Ground | -- | 2 | -- | -- |
1. Parklamp Malfunction 2. Parklamp Switch Malfuntion | ||||
Circuit/System Description
The body control module (BCM) monitors the park lamp switch signal circuit and the headlamp switch signal circuit in order to determine when the park lamps and headlamps should be illuminated. When the headlamp switch is turned to park lamps on position, the BCM senses that the park lamp switch signal circuit is grounded and the headlamps on signal circuit is open. The BCM will then energize the park lamp relay illuminating the park lamps. When the headlamp switch is turned to the headlamps on position, the BCM senses that the park lamp switch signal and the headlamp switch signal circuits are grounded. The BCM will then energize the park lamp relay and the low or high beam headlamp relay illuminating the park lamps and headlamps.
Conditions for Running the DTC
The battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
The BCM detects the headlamp switch signal is active while the park lamp switch signal is inactive.
Action Taken When the DTC Sets
The park lamps will be inoperative or the headlamps will illuminate without the park lamps.
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
Headlights/Daytime Running Lights (DRL) Schematics
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 harness connector X3 at the headlamp switch.
- Ignition ON, verify the scan tool Headlamp Switch parameter is Inactive.
- Install a 3A fused jumper wire between the park switch signal circuit terminal M and the low reference circuit terminal K. Verify the scan tool Parklamp Switch parameter is Active.
- If all circuits test normal, test or replace the headlamp switch.
| ⇒ | If not the specified value, test the signal circuit terminal L for a short to ground. If the circuit tests normal, replace the BCM. |
| ⇒ | If not the specified value, test the signal circuit for 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 |
