Question about 1999 Jeep Grand Cherokee

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My rear lift gate does not unlock. The rest of doors do, it is a four door. Also my front drivers side window does not roll up or down. Here again JUST the drivers window, the rst roll up and down. Could they be related? The lift gate worked two days ago, went to unlock it today and no luck. What do i need to do to fix it.? Thanks.

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  • Expert
  • 47 Answers

For your liftgate lock problem, try checking fuse #8, which is 15A.

The power window could be a switch and/or wiring problem, or a driver door module problem. It is seldom a blown motor, but you can try using jumper wires to test the motor at the green and yellow wires

Posted on Oct 07, 2010

  • driver_48603 Oct 09, 2010

    Thanks guys, got my liftgate fixed. Was the lock actuator. Got one at a salvage yard for 30.00 bucks. For new ones is between 80.00-90.00 dollars, in case somthing like this happens to someone else. Window is a switch which i have to order. Salvage yard one not in good condition. The liftgate was easy to fix, one hex head screw, unplug power wire and it slides out. Be careful when taking liftgate panel off, plastic inserts can break. Thanks again.

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  • Jeep Master
  • 959 Answers

They are not related ...
The lift gate locking mechanism can be accessed by removing the interir trim pannel on the gate ... and locating the locking actuator and replacing it...
The same can be done for the power window motor ... remove the interior trim panel and replace the power window motor...

Hope I helped !!

Posted on Oct 06, 2010

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Posted on Jan 02, 2017

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I have 2005 chevy tahoe my doors all licks but my liftgate door with window stays open use to lock w all my doors? I havent check anytjing yet? I cant lock it.


Here is how it works !
Liftgate Locking Operation
The lift gate will lock any time the vehicle is shifted out of park on vehicles equipped with an automatic transmission and at vehicle speeds exceeding 5 kph with manual transmission. This happens in conjunction with auto door locks if enabled or independently of auto door locks if the feature is disabled. This ensures that the lift gate is locked anytime the vehicle is shifted out of park or when the vehicle is in motion.
The lift gate 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 lift gate lock function has been received by the BCM. The BCM will then ground the control side of the lift gate lock relay. This energizes the relay and allows voltage to be applied to the lift gate lock actuator lock control circuit. Since the other side of the lift gate lock actuator is connected to the normally closed contacts of the door unlock relay to ground, the lift gate will lock. When an unlock function occurs the BCM will ground the control side of the unlock relay and the rear doors and lift gate will unlock.
The BCM also runs diagnostics on the lift gate 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 lift gate lock circuit and that the lift gate is not locked. Faults that will set the DTC and cause the DIC to display the message could be any of the following:
?€¢
An open ECC fuse


?€¢
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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