• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Dome Lamp Switch Signal | 2 | 2 | 2 | -- |
Left Front Door Open Switch Signal | 3 | 3 | 3 | -- |
Left Rear Door Open Switch Signal | 3 | 3 | 3 | -- |
Right Front Door Open Switch Signal | 3 | 3 | 3 | -- |
Right Rear Door Open Switch Signal | 3 | 3 | 3 | -- |
Courtesy Lamp Control | 1 | 1 | -- | -- |
Courtesy Lamp Control-Driver Door | B2555 02 | 1 | B2555 01 | -- |
Courtesy Lamp Control-Passenger Door | B2555 02 | 1 | B2555 01 | -- |
Inadvertent Power Courtesy Lamp Control | 1 | 1 | 1 | -- |
Courtesy Lamp Ground-Driver Door | -- | 1 | -- | -- |
Courtesy Lamp Ground-Passenger Door | -- | 1 | -- | -- |
I/P Dimmer Switch Ground | -- | 2 | -- | -- |
LH Vanity Mirror Courtesy Lamp Ground | -- | 1 | -- | -- |
Liftgate Courtesy Lamp Ground | -- | 1 | -- | -- |
Overhead Console Courtesy Lamp Ground | -- | 1 | -- | -- |
Rear Dome Lamp Ground | -- | 1 | -- | -- |
RH Vanity Mirror Courtesy Lamp Ground | -- | 1 | -- | -- |
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The BCM 3 fuse supplies battery voltage to the body control module (BCM). The BCM applies battery voltage to the courtesy lamps through the courtesy lamp supply voltage circuit. When any door is opened, the jam switch contacts close and the BCM receives a door-open input. If the BCM receives a door lock or unlock input or a rear hatch open input, the BCM will activate the courtesy lamp supply voltage circuit, providing battery voltage to all of the instrument panel (I/P) courtesy lamps, dome lamps, rearview mirror lamps, and rear compartment lamps. The BCM also provides a serial data message to the driver door module (DDM) and front passenger door module (PDM) to apply battery voltage to the door courtesy lamps. In the event that any of these lamps were to remain illuminated for more than 20 minutes with the ignition switch in the OFF position, the BCM will deactivate the inadvertent power courtesy lamp control circuit to prevent a total battery discharge condition.
Battery voltage must be between 9-16 volts.
The DTC will set when the DDM or PDM detects a short to voltage in the courtesy lamp High control circuit.
The DTC will set when the DDM or PDM detects a short to ground in the courtesy lamp High control circuit.
When the DTC is present, the affected door courtesy lamp will remain illuminated.
When the DTC is present, the affected door courtesy lamp will not illuminate.
• | The condition responsible for setting the DTC no longer exists. |
• | A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred. |
After clearing the DTC, the ignition has to be cycled ON and OFF before the inoperative courtesy lamp will operate.
Interior Lighting Systems Description and Operation
Control Module References for scan tool information
⇒ | If greater than the specified range, test the low control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the appropriate door control module. |
⇒ | If the test lamp is always ON, test the high control circuit for a short to voltage. If the circuit tests normal, replace the appropriate door control module. |
⇒ | If the test lamp is always OFF, test the high control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the appropriate door control module. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for DDM or PDM replacement, setup, and programming