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 Descriptor
DTC B3801 00: Passenger Compartment Lamp Request CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Dome/Reading Lamp Control | B2615 00 | B2615 00 | B2615 00 | -- |
Dome/Reading Lamp Supply Voltage | 1 | 1 | -- | -- |
Dome Lamp Switch Signal | 2 | 2 | 2 | -- |
Exterior Lamps Illumination Supply Voltage | 3 | 3 | 3 | -- |
I/P Dimmer Switch Ground | -- | 2 | -- | -- |
LH Vanity Mirror Courtesy Lamp Ground | -- | 4 | -- | -- |
Overhead Console Courtesy/Reading Lamp Ground | -- | 4 | -- | -- |
Rear Dome Lamp Ground | -- | 1 | -- | -- |
RH Vanity Mirror Courtesy Lamp Ground | -- | 4 | -- | -- |
| ||||
Circuit/System 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 directly illuminate the courtesy/dome lamps.
Conditions for Running the DTC
The battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
The BCM detects the courtesy lamp switch is active while the IP lamp dimmer switch at the dim position.
Action Taken When the DTC Sets
The courtesy/dome lamps will be inoperative.
Conditions for Clearing the 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. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Interior Lighting Systems Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
Dimmer Switch Circuit Test
- Ignition OFF, disconnect the harness connector at the IP dimmer switch.
- Test for less than 5.0 ohms between the low reference circuit terminal 10 and ground.
- Verify the scan tool Dimming Input parameter is less than 1.0 volt.
- If all circuits test normal, replace the IP dimmer switch.
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the BCM. |
| ⇒ | If greater than the specified range, test the signal circuit terminal 8 for a short to voltage. If the circuit tests normal, replace the BCM. |
Courtesy Lamp Switch Circuit Test
- Ignition OFF, disconnect the harness connector at the IP dimmer switch.
- Ignition ON, verify the scan tool Courtesy Lamp Switch parameter is Inactive.
- If all circuits test normal, replace the IP dimmer switch.
| ⇒ | If not the specified value, test the signal circuit terminal 9 for a short to ground. 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, programming, and setup |
