How to replace your ignition switch (pics) - Page 5 - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > The 02-09 "How-To" and DIY Section

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Old 04-14-2010, 03:47 PM
sanitcapt1 sanitcapt1 is offline
Junior Member
2003 GMC Envoy SLT XL
Pewter Metallic 4.2L I6 AWD
Join Date: Jul 2009
Location: pennsylvania
Posts: 24
HELP!!!!!!!!!!!!! i just replaced the starter switch and starter relay and i still have the same problem how do i jump the starter to see if that is the problem and where is it located
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Old 05-21-2010, 06:27 PM
richardr richardr is offline
Junior Member
2004 GMC Envoy SLE
Sand Beige Metallic 4.2L I6 2WD
Join Date: Dec 2009
Location: stuart ,florida
Posts: 47
Originally Posted by mellis View Post
Okay, I replaced my ignition switch yesterday. I was nervous, I had read numerous posts about this, but some of them conflicted, and I wasnít sure what I was getting myself into. I havenít done a whole lot of work on newer car systems, although I did replace the stepper motors on my Envoy a while ago. The switch replacement was unbelievably simple, and anyone can do it.

Anyway, I decided to make this post, hopefully itíll help someone who needs to do this in the future.

(FYI, I have a 2004 Envoy XUV, with foot pedal adjustment and tilt wheel controls on the steering column, and had no problem at all.)

First, youíll only need two thin regular screwdrivers and the replacement switch to do the job.

Disconnect your negative battery cable. Iíve heard that you should disable the airbag, but Iíve read that others did not do this, and neither did I. Just to be safe, I tried to stay away from the front of the wheel while working on the switch.

Take one of your screwdrivers and gently pry the covers of the steering column off. They should separate pretty easily, then you just need to remove the bottom cover to get access to the switch.

Once the cover is off, youíll see the bottom of the switch where the harness plugs in, the rest of the switch is slid up into a metal sleeve.

Take your two screwdrivers and insert them into the two holes in the metal sleeve. This pushes back the spring tabs on the ignition switch, allowing you to pull the switch assembly down and out of the metal sleeve. The pictures below have two red arrows showing where the two screwdrivers need to be inserted. The yellow circle shows where the harness connects to the switch. The last picture shows the switch removed from the sleeve, but not disconnected from the harness.

Disconnect the switch from the harness.

Look at the teeth of the old switch and compare them to the new switch. Align the new switch gear with the old switch gear. There is a gap in the gears you should see that greatly helps with the alignment.

Plug the harness into the new switch.

Insert the new switch into the metal sleeve until you hear the spring tabs engage the holes in the sleeve.

Reconnect your column cover.

Reconnect your negative battery terminal.

Start her up.

Hope this helps. Took me about 15-20 minutes to do, and most of that time was spent getting the stupid harness off the old switch.

(Moderators, feel free to relocate this post if necessary.)
Hi guy just used your instution to change mine on the 2004 envoy that I have
now did yours have a battery light showing on after you replaced it???

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Old 06-04-2010, 10:43 PM
fechnerj fechnerj is offline
Junior Member
2003 GMC Envoy SLT
Summit White 4.2L I6 4X4
Join Date: Jun 2008
Location: Spokane, WA
Posts: 21
Mellis--Great write up

. I appreciated the write up on replacing the ignition switch. I have been lurking here to try and get a handle on the problems I've experienced lately with the 03 Envoy. Throwing codes, stalling, and cruise control not working randomly.

Went to dealer first with codes. They replaced the crank shaft position sensor ($340), and wrote on the invoice "other issues may still exist". That's when I started looking myself at the possible "issues". By the way, the problem returned in about 200 miles.

I cleaned the TB, which seemed to help, but within 100 miles the cruise control would trip off at speed, and the rig was dying as well at slow speed.

I bought a new ignition switch and installed yesterday. Thanks to this write-up and pics, the install went well. Have driven so far about 50 miles and all seems OK so far.

I would add to the write up the following: Remove the two screws that hold the knee panel in place. It's not necessary to remove it, but removing the screws helps taking the lower steering column cover off (more clearance).

Secondly, and very important, don't disturb the position of the gear as you remove the switch. It's a challenge because the wire connector comes off kinda hard and the chance to move the gear occurs here. When its out, mark a couple of the teeth on the tops with a black sharpie and at the cooresponding place on the housing so if it does move you can put it back where it belongs. The new switch comes with the gear in the wrong position, at least mine did, so it's necessary to move it and without a reference on the old one its a guess. Mine went in the the right position the first time and started up without issues.
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Old 06-05-2010, 01:33 PM
richardr richardr is offline
Junior Member
2004 GMC Envoy SLE
Sand Beige Metallic 4.2L I6 2WD
Join Date: Dec 2009
Location: stuart ,florida
Posts: 47
Yes donot mass withe old teeth match them up and they will go rite in dont turn a 15 min job into a 60 min
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Old 06-07-2010, 01:01 AM
stemocro stemocro is offline
Junior Member
2002 GMC Envoy
Burgandy 4.2L I6 2WD
Join Date: Jun 2010
Location: Nashville, TN
Posts: 4
Ignition Switch Problem

My problem started off as a motor noise running while the key was removed from my 2002 GMC Envoy. It turned into a no start issue while I tried to remove the ignition switch.

After speaking to a guy at autozone he suggested that I try out an ignition switch since I was getting an ABS light along with the ABS motor running with the car off. We figured it was a cheap try before I drove it to the shop.

So I pulled the ABS fuse to stop the ABS motor and went about removing the ignition switch. I also disconnected the battery.

I pulled the ignition switch out of the cylinder but I could not get the wire connector off the ignition switch easily so I decided to call it a day and try tomorrow. I did screw up and moved the teeth on the ignition switch, but I didn't think this mattered since I was going to put the new one in tomorrow.

Since I gave up for the day, I decided to push the old ignition switch back in place. I did connect the battery.

I tried readjusting the ignition teeth on my old ignition switch (4 settings) and I get door chimes, interior lights, but the key gets stuck, no dash lights, no radio power, and I can't shift out of gear and of course the Envoy won't start.

I'll put up another post after I put in the new ignition switch, any thoughts in the meantime?
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Old 06-08-2010, 01:01 PM
cposowner cposowner is offline
Junior Member
2005 Chevy TrailBlazer LS
Silverstone Metallic 4.2L I6 2WD
Join Date: Jun 2010
Location: chesapeake, VA
Posts: 1
Ignition switch teeth alignment

I recently replaced the ignition switch on my 05 TB to correct the ABS/brake light / blower fan issue. After initially misaligning the teeth on the switch leaving me in the ACC position when I pulled the key out, I think I now have the alignment correct since all 4 key positions are available.

Now I have a new problem, however. The engine is surging when operating at low speeds.

Could this be caused by the teeth being slightly misaligned still?

If so, can anyone describe the proper way to align the teeth (other than line up with the old switch)?
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Old 06-08-2010, 09:49 PM
stemocro stemocro is offline
Junior Member
2002 GMC Envoy
Burgandy 4.2L I6 2WD
Join Date: Jun 2010
Location: Nashville, TN
Posts: 4
New Ignition Switch

I was able to put the new ignition swithc on, had to fiddle with the adjustment, but the vehicle fires up, but still the ABS motor runs with the key out. I'll look on another thread on that issue.
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Old 06-16-2010, 10:41 PM
jmcggnj jmcggnj is offline
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2003 GMC Envoy SLE XL
Monterey Maroon Metallic 5.3L V8 4X4
Join Date: Jun 2010
Location: chanute ks
Posts: 1
i really need help! lock cylinder is stuck in the on position. installed a new switch and lock cylinder and its still stuck in the on position. dont know what to do now.
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Old 06-19-2010, 11:20 PM
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Ohu812 Ohu812 is offline
2006 Chevy TrailBlazer LT G80
Red Jewel Tintcoat 5.3L V8 4X4
Join Date: Apr 2010
Location: Rockford, MN
Posts: 298
Thanks for the great write up. I had the P1682 code show up, so I reset it, and went to the store. Got out of the store and my vehicle started, ran rough, dash lit up like an xmas tree, and dash went dim. I tried to start and nothing, the radio stayed on constantly. After checking the site and running to the local dealership, I replaced the switch and all is good
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Old 06-28-2010, 06:45 PM
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awer25 awer25 is offline
TrailVoy Alumni
2005 Buick Rainier
Platinum Metallic 4.2L I6 2WD
Join Date: Sep 2009
Location: Houston, TX
Posts: 1,012
Pics of initial gear position

I just changed my ignition switch (just preventative) and took some pics of the initial gear position which should help some people. The pics show the position of the gear with the ignition off and the key out (i.e. as you would be installing it). For reference, there is a gap in the gears about the width of a missing tooth. The gap has been circled in red in the pics (it's technically just below flush with the top of the switch).

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