B2645 07 Chevrolet Silverado 2500 HD

The DTC will set when the BCM detects voltage is above 4.9 volts in the ambient light sensor signal circuit or if the ambient light sensor ground circuit is open.

Action Taken When the DTC Sets

When DTC B2645 03 or B2645 07 is present, the ALC will default to ON.

Conditions for Clearing the DTC

1. The condition responsible for setting the DTC no longer exists.
2. You issue a scan tool CLEAR DTCs command.
3. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Reference Information

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

Lighting Systems Connector End Views

Electrical Information Reference

1. «Circuit Testing»(ref-278019-S01379251932008012100000)
2. «Connector Repairs»(ref-278019-S06982211772008012100000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-278019-S21810776732008012100000)
4. «Wiring Repairs»(ref-278019-S25320832652008012100000)

Scan Tool Reference

1. «Scan Tool Output Controls»(ref-277990-S26654000102008012100000)
2. «Scan Tool Data List»(ref-277990-S24476710372008012100000)
3. «Scan Tool Data Definitions»(ref-277990-S11026152172008012100000)