B2645
DTC B2645
Circuit Description
The body control module (BCM) monitors the daytime running lamps (DRL) ambient light sensor signal circuit in order to determine if the DRL or the headlamps should be turned ON in the automatic lamp control (ALC) mode. When the BCM senses the ambient light sensor voltage is between 1-4.9 volts, either the DRL or the headlamps will be commanded ON.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B2645 Ambient Light Sensor Circuit
Conditions for Running the DTC
The system voltage must be between 9-16 volts.
Conditions for Setting the DTC
* When the DRL ambient light sensor signal voltage is less than 1 volt
* When the DRL ambient light sensor signal voltage is more than 4.9 volts
Action Taken When the DTC Sets
The headlamps will remain ON in any ambient light state during ALC mode.
Conditions for Clearing the MIL/DTC
* This DTC will clear immediately after the condition for setting the fault is corrected.
* A history DTC will clear after 100 consecutive ignition cycles without a fault present.
* History and current DTCs can be cleared using a scan tool.
Test
