B3801
DTC B3801
Circuit Description
The body control module (BCM) monitors the courtesy lamp switch signal circuit in order to determine when the courtesy/dome lamps should be illuminated. When the BCM senses that the courtesy lamp switch signal circuit is grounded, when the switch is activated, the BCM will illuminate the courtesy/dome lamps.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B3801 Passenger Compartment Lamp Request Circuit
Conditions for Running the DTC
* The BCM instrument panel dimmer switch reference voltage must be between 4.5-5.5 volts.
* The battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
* When the instrument panel dimmer switch signal is greater than 1 volt.
* When the BCM receives a courtesy lamp ON request signal from the courtesy lamp switch.
Action Taken When the DTC Sets
The courtesy/dome lamps will not operate.
Conditions for Clearing the MIL/DTC
* This DTC will clear on current status 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.
Diagnostic Aids
* Test the courtesy lamp switch for sticking in the ON position.
* Perform a visual inspection for loose or poor connections at all related components. Refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics
Test
