Question about 2000 Buick Park Avenue
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Posted on Jan 02, 2017
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The passenger door module (PDM)
The body control module (BCM)
The driver information center (DIC)
The rear door lock switch
The door lock relay
The door unlock relay
The liftgate lock relay--utility vehicles with liftgate only
The reversible door lock actuators in each of the doors and liftgate
LOCKS 20A fuse (rear lock/unlock relay supply voltage)
ECC 10A fuse (liftgate lock relay supply voltage)
The liftgate lock relay supply and coil sides receive a constant voltage through the battery voltage supply circuit and the ECC fuse. The normally closed contact is connected to ground and the control side is connected to the body control module (BCM). A lock function will occur when a door lock switch activation, keyless entry lock transmission, auto door lock function or a liftgate lock function has been received by the BCM. The BCM will then ground the control side of the liftgate lock relay. This energizes the relay and allows voltage to be applied to the liftgate lock actuator lock control circuit. Since the other side of the liftgate lock actuator is connected to the normally closed contacts of the door unlock relay to ground, the liftgate will lock. When an unlock function occurs the BCM will ground the control side of the unlock relay and the rear doors and liftgate will unlock.
The BCM also runs diagnostics on the liftgate lock relay control circuit and will set DTC B3825 as current and also send a Class 2 message to the DIC. The DIC will display REPLACE LIFTGATE FUSE to inform the driver that a fault has been detected in the liftgate lock circuit and that the liftgate is not locked. Faults that will set the DTC and cause the DIC to display the message could be any of the following:
Jan 15, 2017 | 2006 Cadillac Escalade
An open or short to ground in the lift gate lock relay battery positive voltage circuit
A faulty lift gate lock relay
An open or short to ground in the lift gate lock relay control circuit
A short to ground in the lift gate lock actuator lock control circuit
A faulty BCM
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