• | 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 |
---|---|---|---|---|
TBC 4 Battery Supply | B1480 | B1480 | -- | -- |
Inadvertent Power Supply | B1480 | 1 | -- | -- |
1. Reading and Vanity Mirror Lamps Malfunction |
The body control module (BCM) supplies battery positive voltage to the reading lamps and both visor vanity mirror 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 lamps supply voltage circuit to prevent a total battery discharge condition
The battery voltage must be between 9-16 volts.
• | The TBC 4 fuse battery supply circuit to the BCM is open or shorted to ground. |
• | The inadvertent power supply voltage circuit to the reading and vanity mirror lamps is shorted to ground. |
The reading and vanity mirror lamps will be inoperative.
• | 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. |
Interior Lighting Systems Description and Operation
Control Module References for scan tool information
⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, and the B+ circuit fuse is open, test the inadvertent power supply circuit terminal B18 for a short to ground. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM replacement, programming, and setup