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• | 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 |
---|---|---|---|---|
Courtesy Lamp Control | 2 | 2 | 1 | -- |
Courtesy Lamp Control | -- | 2 | -- | -- |
1. Courtesy Lamps Always Illuminated 2. Courtesy Lamps do Not Illuminate |
Battery voltage for the courtesy lamps is supplied at all times to the body control module (BCM). When the BCM receives a signal to command the courtesy lamps ON, it then applies voltage through the interior/reading lamps and compartment courtesy lamp control circuit.
Interior Lighting Systems Description and Operation
Control Module References for scan tool information
Ignition ON, switch the dome/reading lamps or dome/reading lamps - row ON and OFF while observing the lamp. The concerning reading lamp should illuminate when switched ON.
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM replacement, setup, and programming |
© Copyright Chevrolet. All rights reserved |
© Copyright Chevrolet. All rights reserved |