If an open condition is present on the liftgate lock relay control circuit, the liftgate will unlock but not lock.
The BCM will send a class 2 message to the driver information center (DIC) indicating that a fault has been detected and the DIC will display REPLACE LIFTGATE FUSE.
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
An open or short to ground in the liftgate lock relay battery positive voltage circuit
A faulty liftgate lock relay
An open or short to ground in the liftgate lock relay control circuit
A short to ground in the liftgate lock actuator lock control circuit will open the electronic climate control (ECC) with a lock command
A faulty BCM
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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