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2002-2007 Trailblazer Remote Start Pictorial


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91stt 
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Joined: May 24, 2006
Location: New Jersey, United States
Posted: December 04, 2014 at 10:36 AM / IP Logged  
You will need to use relays to properly add extra ignition or accessory outputs.
I have uploaded a diagram in the downloads section of this site, Adding extra ignitions for remote starting
It shows how to add extra ignitions but the same can be used for accessory outputs by substituting the wire to terminal #86 with the accessory output of the remote start module.
Even though not shown, it is always recommended that the Constant +12V source for terminal #87 be fused. As a personally rule, I do not use any fuse greater than 25A to protect this circuit. Better yet, if you can determine the fuse rating for the ignition or accessory wire you are going to energize, use that as a maximum. Also ensure that the source you are getting the constant +12V can accommodate the additional current. When in doubt, go to the battery for this.
This information is provided only as a reference.
All circuits should be verified with a digital multi-meter prior to making any connections.
stevieb_wv 
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Member spacespace
Joined: December 04, 2014
Location: West Virginia, United States
Posted: December 04, 2014 at 10:49 AM / IP Logged  
From looking at your schematic and reading your post, basically, you are adding a relay to either the ACC1 or IGN1 to trigger off of that signal and then apply the 12V to either the Acc2 or IGN2 wire. Is my understanding correct?
91stt 
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Posted: December 05, 2014 at 10:21 AM / IP Logged  
That is correct.
This information is provided only as a reference.
All circuits should be verified with a digital multi-meter prior to making any connections.
7808 
Member - Posts: 41
Member spacespace
Joined: November 04, 2007
Posted: December 23, 2015 at 1:58 AM / IP Logged  
just fallowed this for my 04 trailblazer .   thank you
7808 
Member - Posts: 41
Member spacespace
Joined: November 04, 2007
Posted: December 28, 2015 at 12:08 AM / IP Logged  
might be worth noting on here, i did not power the brown acc 2 wire because the 1st couple of replies to this pictorial mentioned its (possibly) not nessesary. now my truck has transmission issues when its NOT started with the key. even threw a couple trans related trouble codes. it does not have any issues unless its remote started.
i have not had a chance to climb back under the dash and fix this so im not %100 its the cause.
EDIT i mean the white 2nd ign wire.
https://www.the12volt.com/installbay/forum_posts.asp?tid=90105
kreg357 
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Joined: January 30, 2009
Location: New York, United States
Posted: December 28, 2015 at 4:13 AM / IP Logged  

Always power the White IGN2 wire as an Ignition type wire.  It's mandatory, not optional.  Don't think that this wire was ever mentioned / discussed as being optional in this Pictorial.

The Brown ACC2 wire might be optional on some Trailblazers ( but for my money, the extra relay and time is worth it ).

Soldering is fun!
91stt 
Silver - Posts: 564
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Joined: May 24, 2006
Location: New Jersey, United States
Posted: December 28, 2015 at 10:05 AM / IP Logged  
Depending on the year and power train combination, the TCM is powered by the brown wire. You may be getting your DTC as a result of not powering this wire.
As a general rule, I connect all ignition switch wires for all vehicles. For the cost of the extra relays and a bit of labor, it is far better for my reputation and the time to add these when the customer has a check engine light after they have left.
This information is provided only as a reference.
All circuits should be verified with a digital multi-meter prior to making any connections.
kreg357 
Platinum - Posts: 7,470
Platinum spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: January 30, 2009
Location: New York, United States
Posted: December 28, 2015 at 6:07 PM / IP Logged  

A big +1, 91stt.  Well said!

Might even be worth it to put a meter on the IGN2 and ACC2 wires after the install to verify that they do indeed receive power correctly during a remote start.  ( I started doing this after a 30/40 Amp SPDT relay harness socket had a bad crimp on one if its' leads.  Fixed it before customer pick-up but it did have me scratching my head for a while...) 

Soldering is fun!
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