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2007 chevy trailblazer_lt
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128 Posts
Discussion Starter · #1 ·
To all you newer members I just found out something new today by another TB owner while at the dealer.

When you lock your truck, check to see if you can open the tailgate window. To my surprise mine opened......my jaw near half dropped. I've had the truck 3 months now and didn't even know about this. I did some searching here and it has been discussed previously however I thought it would be good to mention it again.

Apparently there is a TSB on this and they adjusted the locking mechanism.
 

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2007 chevy trailblazer_ls
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166 Posts
Have the same problem on my 2007 Trailblazer. Trying to find the TSB. Anyone have pic's on how to fix ?? Thanks.
 

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2007 chevy
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4,644 Posts
I have a 07 TB LS and after seeing this thread, I went to go test it and about a 2 second delay, my alarm went off. I tested this twice than alarm went off twice. I think its dumb that it does stay locked and that it can be opened up :confused:
 

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2007 chevy trailblazer_ls
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166 Posts
I read here on the forum a member brought his car to the dealer and it was fixed in 15 minutes. Can someone tell me how to fix my tailgate lock. I opened the window and pressed my remote, pushed the button release for window and close the rear window and then it was locked. But as I unlocked and locked again it wouldn't lock again by the remote. Help ???????
 

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2008 chevy trailblazer_lt
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78 Posts
I went out and checked mine as soon as I read this because we just came back from an 8 day road trip to the Grand Canyon. With all the stuff we had in the Trailblazer, I would have freeked out if my rear window did no lock. When my tailgate locks, the rear window locks. I tried it 3 times and it always locked.
 

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2007 chevy trailblazer_ss_3ss
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340 Posts
Had the same issue on my 07 TBSS - drove it around for about 5 months and went on a road trip to Vegas, when I found out the rear windows would not lock. And if I pushed the button to the open the window when it was supposedly locked, it would open WITHOUT TRIPPING THE ALARM!!! :duh: :confused:

Soon as I got back from the trip, I went straight to the dealer and they replaced what they called a faulty sensor under warranty. Whether that was true or not, it fixed the problem.
 

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2007 chevy trailblazer_ls
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166 Posts
Getting even more confused; someone said it was a rod that needed adjustment. Now its a bad sensor. Is is both ????
 

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2004 gmc envoy_sle
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You need to pull the tailgate pannels and that way you can see what's going on. When you hit the lock the rod is supposed to rotate the latch assy so that when you push the button it doesn't pop the window open. What happens to most is the rod gets cought on a bracket of the tailgate and doesn't rotate the piece of the latch enough. Thus even though it's rotated some it is not enough to be out of the way of the button. Just pull the plastic and you can see what's going on, it's better to see it in person:cool:
 

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2007 chevy trailblazer_ls
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Here's the TSB:

| Document ID: 2011058
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#07-08-52-003: Rear Liftgate Glass May Not Lock When Using Remote Keyless Entry (RKE)/Key Fob Transmitter/Door Lock Switch, Lifgtate Hatch or Liftgate Glass May Lock/Unlock When Rear Liftgate Glass Button Depressed - (Sep 13, 2007)


Subject: Rear Liftgate Glass May Not Lock When Using Remote Keyless Entry (RKE), Key Fob Transmitter or Door Lock Switch, And/Or Liftgate Hatch Or Liftgate Glass May Lock Then Unlock When Rear Liftgate Glass Button is Depressed (Reposition Lock Cylinder Wave Washer and Adjust Lock Rod)


Models: 2005-2007 Buick Rainier

2005-2008 Chevrolet TrailBlazer, TrailBlazer EXT, TrailBlazer SS

2005-2008 GMC Envoy, Envoy XL, Envoy Denali

2005-2008 Saab 9-7X




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Do This
Don't Do This

Reposition liftgate lock cylinder wave washer and adjust lock rod.
DO NOT replace the liftgate latch or actuator.


Condition
Some customers may comment on one or more of the following conditions:

• The rear liftgate glass may not lock when using the remote keyless entry (RKE), key fob transmitter or door lock switch unless the lock is pressed a second time.

• The rear liftgate or glass locks, but may be unlocked when the rear liftgate lock cylinder button is depressed.

• The rear liftgate locks but the liftgate glass may not lock.

Cause
These conditions may be caused by one or all of the following:

• The rear liftgate cylinder lock rod may be out of adjustment.





• The wave washer on the liftgate lock cylinder may be out of position with the cup side down.

• Excessive movement or slack in the lock rods at the liftgate bell crank assembly.





• The liftgate lock cylinder pawl may contact the rear liftgate glass latch when the lock cylinder button is depressed.

Correction
Important: Do Not remove the rear liftgate lock cylinder from the vehicle to perform this repair.

Reposition the rear liftgate lock cylinder wave washer and adjust the lock rod using the steps below.

Verify the customer's condition.

Open the liftgate.

Remove the upper liftgate garnish molding.

Remove the rear liftgate trim panel.

Remove the cylinder lock rod from the threaded lock rod retaining clip.

Tip
Place the tip of a screwdriver blade into the opening of the C-clip and slowly rotate the screwdriver to pry out the C-clip from the shaft. Then use needle-nose pliers to remove the C-clip.

Remove the C-clip from the rear liftgate lock cylinder push button and remove the wave washer.

Install the wave washer with the cup side up.

Position the wave washer with the curved edges of the wave spring parallel to the tabs on the lock cylinder shaft.

Important: Use needle-nose pliers to slightly squeeze the C-clip back into shape. Make sure the clip seated, you should feel a snap and hear an audible click.

Install the C-clip onto the shaft and in the slot using needle nose pliers. Then rotate the pawl several times to make sure the C-clip does not rotate. If the clip rotates then the clip is not fully seated.

Position the lock cylinder pawl to the full clockwise position.

Pull up on the cylinder lock rod to remove any slack in the bell crank.

Install the cylinder lock rod into the threaded lock rod retaining clip while removing any slack from the lock rod linkage.

Close the lock rod retainer clip.

Close the liftgate assembly.

Open the liftgate glass while keeping the liftgate closed.

Use the key fob to cycle the liftgate to the lock and unlock position while inspecting the rear liftgate pawl. The lock cylinder pawl should have clearance between the latch as shown above. If the pawl is contacting the latch, readjust the cylinder lock rod.

Verify that the customer's condition has been corrected.

Install the rear liftgate trim panel.

Install the upper liftgate garnish molding.
 

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2007 chevy trailblazer_ls
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166 Posts
rear window lock

Was able to remove rear interior panel (found in seach under remove interior tailgate panel). See pic's. Adjusted little rod by unsnapping the yellow clip and moving rod more into the middle of the yellow clip. All fixed, thanks for all the help.
 

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2007 buick rainier
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328 Posts
Did the last pic get flipped? ON the other the module is on the left and on the last pic it's on the right.
 

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2007 chevy trailblazer_lt
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756 Posts
good to know now that i've had my TB for a year and just found out that the rear glass prob never has locked. and i have to park on some sketchy streets in Boston sometimes.. not to mention it doesn't even trip the alarm.

i'll have to fix it this weekend. thanks for the info.
 

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2007 chevy trailblazer_lt
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34 Posts
Sheesh. If you run across this thread, please check your hatch locks. I found out tonight that my hatch glass hasn't been locking. Who knows how long I've been putting expensive items at risk in the TB.

All it took was some lube on the lock mechanisms and repositioning the actuator rod on the yellow tab.
 

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2002 chevy trailblazer_ls
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19 Posts
i just found this out tonight as well though i have an older 2002 TB though i can t even get my glass to open any time the plunger is stuck in the depressed zone my whole gate will open when doors are locked though Nice Chevy well i know what i ll be doing tomorrow
 

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2007 chevy trailblazer_lt
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756 Posts
I found out that if I press 'Lock' on the key fob three times the rear window will lock, if I just press twice all other doors will lock but not the rear glass.
 

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2007 chevy trailblazer_lt
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241 Posts
I tried my lift glass and I can't even open it (locked or unlocked) but if the car is locked and I push the lift glass button it unlocks the lift gate. SOB. Gonna have to take a look see tonight.

Is there a write up on the forums on how to remove the liftgate trim? I searched and nada.
 

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2007 chevy trailblazer_lt
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241 Posts
I just performed this fix tonight. My rear glass would not open at all and I found that pushing the lock cylinder would unlock the gate.

Took about 20 minutes after removing the interior panels (I made sure it worked a number of times and readjusted the lock rod to ensure solid contact between the cylinder and latch release since it was off to begin with.

The attached image is from a previous post.

Make sure you are gentle removing the yellow lock clip and when removing the c-clip.

I put everything back together and all is working correctly. Easy fix for anyone with a small Flathead and pair of needle nose pliers.
 

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