Lamp Fade Failure Short To Battery
When Monitored: Ignition in RUN and IOD fuse/connector installed.
Set Condition: The BCM has detected a short to battery on either the Courtesy Lamp Driver circuit or the Courtesy Lamp Control circuit for 5 seconds.
Possible Causes are:
- SHORTED COURTESY LAMP BULB
- COURTESY LAMP CONTROL CIRCUIT SHORTED TO BATTERY
- COURTESY LAMP DRIVER CIRCUIT SHORTED TO BATTERY
- BCM
- COURTESY LAMP CIRCUIT
- Turn ignition off. Remove one of the bulbs listed in the previous pop up message. Turn ignition on. Using the DRBIII(R), erase all BCM DTC's. Using the DRBIII(R), read BCM DTC's. Is the "Lamp Fade Failure Short to battery" DTC present? If yes, go to next step. If no, replace bulb, and reinstall all other bulbs removed during testing. Perform BODY VERIFICATION TEST VER 1 under VERIFICATION TESTS.
- Turn ignition off. Remove fuse No. 8 from the Junction Block. Disconnect the BCM C1 connector. Turn ignition on. Measure the voltage of the Courtesy Lamp Control circuit in the BCM C1 connector. Is there any voltage? If yes, repair the Courtesy Lamp Control circuit for a short to battery and reinstall all bulbs removed during testing. Perform BODY VERIFICATION TEST VER 1 under VERIFICATION TESTS. If no, go to next step.
- Turn ignition off. Disconnect Fuse No. 8. Disconnect the Junction Block C1 Connector. Turn ignition on. Measure the voltage of the Courtesy Lamp Driver circuit in the Junction Block C1 connector (cavity 16). Is there any voltage? If yes, repair the Courtesy Lamp Driver circuit for a short to battery and reinstall all bulbs removed during testing. Perform BODY VERIFICATION TEST VER 1 under VERIFICATION TESTS. If no, replace the Body Control Module and reinstall all bulbs removed during testing. Perform BODY VERIFICATION TEST VER 1 under VERIFICATION TESTS.
NOTE:
Repeat this test for each of the following bulbs before proceeding to the next step: Instrument Panel Courtesy (2), rear Reading (2), Front Overhead (2), and Liftgate. After each test, leave the bulb out.