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Courtesy Lamps Inoperative From Liftgate

Possible Causes are:

  1. Using the DRBIII(R) in Inputs/Outputs, read the Lift Gate Lmp Disable state while depressing the cargo lamp lens switch ON and OFF. Did the disable switch toggle? If yes, go to next step. If no, go to step  7 .
  2. Using the DRBIII(R), select: Body, Computer Input/Output. Read the Liftgate Sw state with the Liftgate open. Does the DRBIII(R) show CLOSED? If yes, and no other problems are found, replace the BCM. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS. If no, go to next step.
  3. Disconnect either the right or left side Liftgate Ajar Switch connector. Measure the resistance of the ground circuit. Is the resistance less than 5 ohms? If yes, go to next step. If no, repair the open ground wire to the ajar switch connector. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.
  4. Disconnect the Junction Block C1 connector. Disconnect either the right or left side Liftgate Ajar Switch. Measure the resistance of the Liftgate Flip-up Ajar Switch Sense circuit between the disconnected Flip-up Ajar Switch connector and the Junction Block C1 connector. Is the resistance less than 5 ohms? If yes, go to next step. If no, repair the open Liftgate Ajar Switch Sense wire. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.
  5. Disconnect the suspect faulty Right or Left Liftgate Ajar Switch connector. Ensure the latch is in the unlatched position for the particular switch. Using an ohmmeter, measure the resistance of the Ajar Switch. Is the resistance less than 2 ohms? If yes, go to next step. If no, replace the liftgate ajar switch assembly. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.
  6. If there are no possible causes remaining, replace Body Control Module. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.
  7. At the Cargo Lamp connector, backprobe and measure the voltage of the liftgate courtesy lamp disable circuit with switch in both positions. Is the voltage less than 0.5 volt in either position? If yes, and no other problems are found, replace the BCM. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS. If no, go to next step.
  8. Disconnect the cargo lamp connector. Measure the voltage of the liftgate courtesy lamp disable circuit. Is the voltage more than 2 volts? If yes, repair the courtesy lamp disable circuit for a short to voltage. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS. If no, replace the cargo lamp assembly. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.
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