Overhead, Rear And Liftgate Lamps Inoperative

Possible Causes are:

• BULBS OPEN
• FUSED B (+)
• COURTESY LAMP DRIVER CIRCUIT OPEN
• BCM COURTESY LAMP DRIVER

1. Remove and check inoperative bulbs. Are the bulbs OK? If yes, go to next step. If no, replace the bulbs. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.
2. Measure the voltage of the Fused B (+) circuit to the Lamp. Is the voltage more than 10 volts? If yes, go to next step. If no, repair the open Fused B (+) circuit back to splice. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.
3. Turn ignition off. Disconnect the Junction Block C1 connector. Gain access to an inoperative bulb. Measure the Courtesy Lamp Driver circuit from the Junction Block C1 connector cavity No. 16 to the bulb connector. Is the resistance less than 5 ohms? If yes, go to next step. If no, repair the open Courtesy Lamp Driver circuit. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.
4. Turn the Dome Lamp Switch to the ON position. Disconnect Fuse No. 8 from the Junction Block. While backprobing, measure the resistance of the Courtesy Lamp Driver circuit at the Body Control Module C1 connector cavity No. 8. Is the resistance less than 5 ohms? If yes, test is complete. If no, replace the Body Control Module (BCM). Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.