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 (I/P) 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 I/P 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.
TEST
