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 Descriptors
DTC B2645 03: Ambient Light Sensor Circuit Below ThresholdDTC B2645 07: Ambient Light Sensor Circuit Above Threshold
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
DRL Relay B+ | 2 | 2 | -- | -- |
Ambient Light/Sunload Sensor Signal | B2645 03 | B2645 07 | B2645 07 | -- |
Daytime Running Lamps Control | 2 | 2 | B2600 00 | -- |
Ambient Light Sensor Ground | -- | B2645 07 | -- | -- |
DRL - Left Front Ground | -- | 1 | -- | -- |
DRL - Right Front Ground | -- | 1 | -- | -- |
1. Headlamps Malfunction 2. Daytime Running Lamps Malfunction | ||||
Circuit/System Description
The ambient light sensor is used to monitor outside lighting conditions. The ambient light sensor provides a voltage signal that will vary between 0.2 and 4.9 volts depending on outside lighting conditions. The body control module (BCM) monitors the ambient light sensor signal circuit to determine if outside lighting conditions are correct for either daytime running lights (DRL) or automatic lamp control (ALC) when the headlamp switch is in the AUTO position. In daylight conditions, the BCM will command the DRLs ON by applying ground to the DRL relay via the DRL relay control circuit. When the BCM applies ground to the DRL relay control circuit, the DRL relay coil energizes causing the relay switch contacts to close. With the DRL relay switch contacts closed, battery voltage flows through the DRL fuse to the left and right DRL. Any function or condition that turns on the headlamps will cancel DRL operation.
Conditions for Running the DTC
Battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
B2645 03
The DTC will set when the BCM detects a short to ground in the ambient light sensor signal circuit.
B2645 07
The DTC will set when the BCM detects a short to voltage or an open/high resistance in the ambient light sensor signal circuit.
Actions Taken When the DTC Sets
| • | Automatic lamp control (ALC) is inoperative. |
| • | The BCM defaults to low light status and commands the low beam headlamps ON. |
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists. |
| • | A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred. |
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 at the ambient light/sunload sensor.
- Ignition OFF, test for less than 5.0 ohms between the ground circuit terminal C and ground.
- Ignition ON, verify the scan tool ambient light sensor parameter is greater than 4.5 volts.
- Install a 3A fused jumper wire between the signal circuit terminal D and the ground circuit terminal C. Verify the scan tool light sensor parameter is less than 1.0 volt.
- If all circuits test normal, test or replace the ambient light/sunload sensor.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the BCM. |
| ⇒ | If greater than the specified range, test the signal circuit for a short to voltage or 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, setup, and programming |
