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I have a 2005 GMC Yukon that the rear hatch does not lock. Wouldn't be a problem but no manual key hole to lock it. Must be some kind of lock sensor. Is on the driver door panel or by the hatch?

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  • GMC Master
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The rear hatch locking is computer contolled .
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:
• An open ECC fuse
• 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
• A faulty BCM

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 power door lock system consists of the following components:
• The driver door module (DDM)
• 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)

If i were to guess i would say you mite need a new lock actuator , but i don't guess . You could take the hatch inside panel off an check for B+ voltage for the lock actuation as someone pushes the switch . Or have it checked for codes .

Posted on Dec 21, 2016

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SOURCE: 2005 gmc yukon back passenger doors will not

My wife's 2003 Yukon wouldn't lock the rear doors or hatch, but it would unlock. My problem was the lock relay was bad. There are two relays, one for lock and one for unlock. They are located in the fuse panel on the left side of the console. Open the drivers door and you will see a cover that pops off. Behind this are several fuses and relays. Consult your manual to see which is the lock and unlock relays. They are side by side on a 2003. They pull straight out. I replaced both and they were around $10 apiece at any auto store.

Posted on Aug 01, 2009

Molson02536
  • 3854 Answers

SOURCE: My GMC 2005 Yukon XL

Here is a link on how to fit your rear hatch issues.

http://gmcowners.com/gmc-forum/showthread.php?t=12619

Thank you for using fixya.

Posted on Apr 18, 2010

emissionwiz
  • 76164 Answers

SOURCE: 2005 GMC YUKON REAR HATCH ACTUATOR BUZZING

Check the ground to the actuator, if that is ok replace the actuator.

Posted on Aug 28, 2012

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1 Answer

2005 GMC YUKON REAR HATCH ACTUATOR BUZZING


Check the ground to the actuator, if that is ok replace the actuator.

Aug 28, 2012 | 2005 GMC Yukon

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2005 GMC BACK HATCH WON'T OPEN


It sounds like the lock actuator has failed or has a poor connection which won't allow the latch to release. What you will need to do is remove the inside rear hatch panel to access the lock actuator. Once you get to the latch use a flat screwdriver to release the latch being careful not to damage the glass.

-----------
Click this link below for more troubleshooting:-- http://technoanswers.blogspot.com/2011/09/rear-hatch-wont-open-on-2005-gmc-yukon.html -------- This will help.Thanks.Helpmech.

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You just go to an auto parts store or dealer & buy the struts

You don't pay a repair shop to put them on

You wouldn't have someone replace your wiper blades
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My GMC 2005 Yukon XL Denali Rear hatch and window will not unlock. The other doors lock and unlock properly. How do I fix it?


Here is a link on how to fit your rear hatch issues.

http://gmcowners.com/gmc-forum/showthread.php?t=12619

Thank you for using fixya.

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2 Answers

05 yukon rear hatch quit locking all other work fine.


Yes, had the same problem on my 05, The mechanism that operates the latch can fail, this part costs about $300 dollars and is only available at the dealer but you can save the labor and do it yourself.

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1 Answer

HOW TO OPEN LIFT GATE OF 2005 YUKON XL. I ASSUME THAT THE RELAY UNDER THE HOOD IS GOOD, SINCE ALL OTHER FOUR DOORS WORK. (LOCK-UNLOCK). I THINK THAT IT MIGHT BE A SOLEONID IN THE LIFT GATE ITSELF. NO KEY...


have you had someone try the unlock while you listen at the hatch to see if you hear the solenoid working?
My guess is your going to have to remove the rear hatch panel to gain access

Dec 07, 2009 | 2003 GMC Yukon Denali

1 Answer

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The lock is stuck in the "locked" position.
When you close the hatch, it is jamming the latch hook into the wrong area.

Manually open the hatch. Unlock the hatch (even tho the hatch is already open). there are two bolts holding the metal "loop", the loop has moved. Adjust the metal loop and close the hatch / lock it, etc.

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2 Answers

2005 gmc yukon back passenger doors will not unlock with key remote and rear hatch wont unlock or open


Either the relay for the locks is bad or the fuse. When you push the power lock on the inside if the doors do not unlock then I would check the fuses, both inside and under the hood. If they do work then the relay/s may be bad. You are pushing your key button twice correct?

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