Circuit Description
The body control module (BCM) flashes the headlamps and pulses the horns when a theft attempt is detected. The BCM grounds the headlamp and parklamp control circuits via a discrete input of the daytime running lamps (DRL) control module. The DRL control module actuates the headlamp and parklamp relays internal to the DRL control module.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC 006 Exterior Lamp Output Circuit High/Low
Conditions for Setting the DTC
The BCM detects a short to battery or short to ground in the exterior lamps output circuit.
Action Taken When the DTC Sets
| • | The BCM sets the DTC 006. |
| • | The BCM does not turn on the headlamps during the armed, warning, or alarm modes. |
Conditions for Clearing the DTC
A short to battery or short to ground in the exterior lamps output circuit is no longer present between the BCM and the DRL control module.
Diagnostic Aids
| • | If the exterior lamps output circuit is shorted to ground, the headlamps will stay ON at all times. |
| • | Move the wiring and the connectors while you complete the following tests. This may cause the malfunction to appear. |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Theft Deterrent System Schematics Connector End View Reference: Theft Deterrent System Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 | Perform the body control module (BCM) output test. Refer to Body Control System Description and Operation in Computer/Integrating Systems. Do the headlamps turn ON for 1 second when the BCM performs test 4? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
Does the test lamp flash? | Go to Step 5 | Go to Step 4 | |
4 | Test for an open or short in the exterior lamps output circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 6 |
5 | Inspect for poor connections at the harness connector of the DRL control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct a condition? | Go to Step 9 | Go to Step 7 |
6 | Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct a condition? | Go to Step 9 | Go to Step 8 |
7 | Replace the DRL control module. Refer to Daytime Running Lights (DRL) Control Module Replacement in Lighting Systems. Did you complete the repair? | Go to Step 9 | -- |
8 | Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 9 | -- |
9 |
Does the DTC reset? | Go to Step 2 | System OK |
