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| • | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Ambient Light Sensor Signal | B2645 03 | B2645 07 | B2645 07 | -- |
Daytime Running Lamp Control - Left | 2 | 2 | 2 | -- |
Daytime Running Lamp Control - Right | 2 | 2 | 2 | -- |
Dipped Beam Headlamp Control - Left | 1 | 1 | 1 | -- |
Dipped Beam Headlamp Control - Right | 1 | 1 | 1 | -- |
Ambient Light Sensor Low Reference | 2 | B2645 07, B0163 05, B0183 05 | 2 | -- |
Daytime Running Lamp Ground - Left | -- | 2 | -- | -- |
Daytime Running Lamp Ground - Right | -- | 2 | -- | -- |
Headlamp Ground - Left | -- | 1 | -- | -- |
Headlamp Ground - Right | -- | 1 | -- | -- |
1. Headlamps Malfunction 2. Daytime Running Lamps Malfunction | ||||
The ambient light sensor is used to monitor outside lighting conditions. The body control module (BCM) provides a low reference ground and 5V reference signal to the ambient light sensor. Depending on outside lighting conditions, the ambient light sensor provides a voltage signal to the BCM that will vary between 0.2-4.9 V. The BCM monitors the ambient light sensor signal circuit to determine if outside lighting conditions are correct for either daytime running lamps (DRL) or automatic lamp control when the headlamp switch is in the AUTO position. In daylight conditions, the BCM will command the DRL ON by applying voltage to the left and right DRL control circuits illuminating the DRL. Any function or condition that turns on the headlamps will cancel DRL operation.
Battery voltage must be between 9-16 V.
The BCM detects a short to ground in the ambient light sensor signal circuit.
| • | The BCM detects a short to voltage or an open/high resistance in the ambient light sensor signal circuit. |
| • | The BCM detects an open/high resistance in the ambient light sensor low reference circuit. |
| • | The BCM defaults to low light status and commands the dipped beam headlamps ON. |
| • | Daytime running lamps are inoperative. |
| • | The condition responsible for setting the DTC no longer exists. |
| • | A history DTC will clear once 100 consecutive malfunction free vehicle ON/OFF switch cycles have occurred. |
Headlamps/Daytime Running Lamps (DRL) Schematics
Exterior Lighting Systems Description and Operation
Control Module References for scan tool information
| ⇒ | If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K33 HVAC Control Module. |
| ⇒ | If less than the specified range, test the signal circuit terminal 5 for a short to ground. If the circuit tests normal, replace the K9 Body Control Module. |
| ⇒ | If greater than the specified range, test the signal circuit for a short to voltage an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM or HVAC control module replacement, programming and setup |
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