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My 2005 Trailblazer hatch will not unlock and open. I know it is electrical but I have already replaced fuses and relays.

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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?


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 .

Dec 21, 2016 | GMC Cars & Trucks

1 Answer

My hatch won't release from the remote or the door switch. No solenoid sound at the hatch. How do I get it to open if it's not a bad fuse?


There are actually three relays , an there are controlled by the BCM - body control module !
When a door lock switch is activated in the lock or unlock position the BCM will receive a voltage signal on either the door lock switch lock or unlock signal circuits.
The BCM, upon receipt of a lock switch lock or unlock signal, will switch the appropriate lock relay control circuits to battery positive voltage. This will energize the appropriate lock or unlock relays. The relay will supply voltage to the door lock actuator lock or unlock control circuits to one side of the lock actuator. Since the opposing side of the lock actuators are connected to ground through the other lock actuator control circuit and the normally closed contacts of the lock or unlock relay, the doors and liftgate will then lock or unlock appropriately.
Three relays are used to operate the locks. DRV DR UNLCK relay, PASS DR UNLOCK and DR LCK relay. This is done to isolate the driver door lock actuator so it can be unlocked by itself using the keyless entry transmitter.
Rear Hatch/Gate Description and Operation
The liftgate can be opened by operating the switch on the instrument panel. Battery voltage is supplied to the liftgate actuator through the body control module (BCM). The BCM will pulse the liftgate actuator when a release input is received through the key fob, or the instrument panel switch.
Door/Lift gate Latch Assembly
  1. Install a 20-A fused jumper wire between the control terminal 3 and 12 volts. Install a jumper wire between the ground terminal 2 and ground.
  2. Verify the actuator turns on & off.
?‡'
If the function does not perform as specified, replace the applicable door latch.

Oct 01, 2015 | 2006 Pontiac Torrent

1 Answer

2005 chevy trailblazer ext back hatch lock is engaged and will not open leaving the door unable to close


Open the hatch and slip a screwdriver's shaft into the opening of the latch (simulating that the latch has engaged the metal bar on the floor of the SUV). Apply pressure in the latch via the shaft of the screwdriver. While pulling against the latch, operate the unlock button of the fob or unlock with the key (whichever your truck has). When it is unlocked the latch will allow the screwdriver to open the jaws of the latch and pull through them. The latch jaws should now be open and you should be able to close the hatch and have it latch and lock.

Mar 02, 2014 | 2004 Chevrolet TrailBlazer

1 Answer

I have a 2005 trailblazer, the hatch and back window will not open. I don't hear any motor sound when trying to open. Could the problem be a fuse? If so, where would that be located?


Yes the problem could be a fuse or a bad motor either one. Every vehicles fuse panel is located in a different spot. The best way to locate the fuse panel in your blazer would be to look in your owners manual. However most of the time the fuses are either on the driver's side under the dash or in the glove box. I hope this helps you out

Aug 26, 2011 | 2005 Chevrolet TrailBlazer

2 Answers

My rear hatch will not open on my 2005 saturn vue. There is no key lock on the outside in my model. Any idea how to fix it?


Sorry, I don't have the data now..... but.Some hatches have a manual release on the inside. There might be a small plate near the door center that you can remove and open the hatch with a screwdriver.

but...I'm not sure tho about your car.

Jul 30, 2011 | 2005 Saturn VUE

2 Answers

Rear hatch 2005 chevy tahoe is locked & won't open


my 06 tahoe just got this problem...all other doors lock and unlock with the fab and door switch...but the hatch is in permanent locked mode. i cant even unlock the hatch window. why is this happening?

Jan 27, 2010 | 2006 Chevrolet Tahoe

4 Answers

Rear hatch will not unlock on my 05 Denali


Check the unlock mechanism for the hatch. These are controlled by an electrical motor pulling a cable. If the cable came loose you might or might not hear the click click that it makes. I would also check the fuses and relays related to the system. Usually if you can get the interior panel off all the innards are exposed. I would suggest pulling that panel off, then triggering the keyless remote and see if anything moves, that might pinpoint where it has gone bad.

Sep 28, 2009 | 2005 GMC Yukon Xl Denali

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?

Jun 21, 2009 | 2005 GMC Yukon Xl Denali

1 Answer

Hatch-back door will not open


I can say I have had the same problem, only the back doors and the rear hatch/glass won't open using keyless remote from them freezing this Winter.  The front two driver/passenger doors will unlock with keyless remote but none of the rear doors, hatch or glass.  Since I had to replace the stoplight bulbs in the rear with one not working and I don't need a ticket on Memorial Day weekend (need to replace 2 at the same time is wise according to any good mechanic), I had to get the rear hatch open to get to the lamp assembly and replace the bulbs.  My thinking was that since my two front locks were opening but no others and my keyless remotes are working, it has to be a fuse or relay that is not working!  So, I talked with a NAPA rep and he said the "Day running lights" relay can be a temporary fix to get the rear locks open to replace the bulbs.  I looked up in the owners manual where both relay's are located and removed the "Locked" relay and "Day running lights" relay and put the "Day running lights" into the same slot where the "Locked" relay was not operating and it worked!  I got the doors unlocked and replaced my stoplight bubs replaced.  Now, I have a new problem, my Tahoe won't start!!  I'm assuming the relay wasn't supposed to stay in the wrong slot when operating the vehicle because I started the truck, and it started and died-started and died-same and again.  I think the wrong fuse can be used to fix another problem like a fuse.  But, a fuse you can leave in and deal with one operation in the vehicle not working until you can replace the fuse later when you purchase it.  But, not a relay!  Now, I think the confused electronics cause another component (possibly the fuel pump relay) to burn out with the wrong relay in place of another when the vehicle operates.  I should have known but I was so glad to get the doors open after two months and it being Memorial Day weekend.  Now I have to find out what else is wrong so don't make that mistake to avoid the same predicament.  Better to get the relay ordered and replaced than to have this happen to you. 

Apr 09, 2009 | 2005 Chevrolet Tahoe

2 Answers

My 2005 trailblazer rear hatch won't unlock and my rear wipers don't work


powere or ground problem. Start tracing wires/checking fuses

Mar 06, 2009 | 2004 Chevrolet TrailBlazer

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