02 trailblazer, keyless entry
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=70270
Printed Date: May 04, 2024 at 10:04 PM
Topic: 02 trailblazer, keyless entry
Posted By: tahawus84
Subject: 02 trailblazer, keyless entry
Date Posted: January 06, 2006 at 6:20 AM
I am trying to install keyless entry on a 02 trailblazer. I have a 457g data bus connector and a DEI 712t keyless entry system. I have a few questions I hope someone can help me with about connections. The following is how I have it wired maybe someone can tell me if this is correct. Data bus connector - keyless entry connector Light green (neg lock) - GREEN/ black (lock #30 common output) Blue (neg unlock) - blue/black (unlock #30 common output) Green (neg. door trigger) – Blue ((-) 200ma second unlock output) If I didn’t explain something good enough let me know and thanks for your help.
Replies:
Posted By: streetdream
Date Posted: January 06, 2006 at 11:41 AM
The purple wire from the 457G goes to the purple wire on the OBD-II port. The green wire from the 457G goes to the GREEN/ black of the 712t. The blue wire from the 457G goes to the blue/black of the 712t. Violet on the 712t gets grounded. Violet/black on the 712t gets grounded. Red on the 712t goes to constant +12v. Black on the 712t gets grounded. RED / white from the 457G goes to RED / white on the 712t. Gray/white from the 457G goes to switched +12V. Anything else? That's for basic keyless entry. -Christopher ------------- MECP First Class
Bay Manager
Posted By: tahawus84
Date Posted: January 07, 2006 at 1:28 PM
Thanks for the help. I put everything in the car today and I dont get any response. The light on the 457g stays lit and the alarm box will make a clicking noise when I press the buttons but the doors dont lock/unlock. Any suggestions?
Posted By: tahawus84
Date Posted: January 07, 2006 at 3:30 PM
I havea 02 trailblazer and just installed the keyless entry. I have a few questions. How can I get at rear hatch to lock and unlock with the other doors? Right now it wont lock or unlock but all the other doors will. Also how can I make the headlights and reverse lights come on when the doors are unlocked? I have a 457gw data bus connecter and a dei 712t keyless entry system. Thanks for the help guys.
Posted By: ducatidesmo
Date Posted: January 07, 2006 at 6:02 PM
It sounds like you haven't programmed the box yet. If I'm wrong sorry and please disreguard. anyway, all you have to do is unplug the unit, press and hold the button on the other side and plug it back in, turn the ignition on (not start) until it flashes then let it go and start the truck. that's it, it is programmed.
Posted By: uffdog
Date Posted: January 07, 2006 at 6:03 PM
Did the car come equipped with power locks? If it did the bypass should handle it all throught the data bus once you get it hooked up ------------- RFD
Posted By: tahawus84
Date Posted: January 07, 2006 at 6:05 PM
yes the car has power locks and they work with the bypass unit but nothing happens for the rear door. the other four doors lock and unlock like normal. I dont know if I amsuppost to hook up somthing else??
Posted By: uffdog
Date Posted: January 07, 2006 at 6:11 PM
I' m not familar with your bypass , I used a trilogic gmdl-bp and I can program it for priority unlock of drivers door on the first press of the remote button, second press opens all the rest,or I can program it to open all the doors on the first press ------------- RFD
Posted By: JWorm
Date Posted: January 08, 2006 at 8:51 AM
The rear door not locking is a known issue with the 457G and Trailblazer. I think DEI said they were working on updating the software to fix it. I would switch to a GMDL-BP
Posted By: Mike M2
Date Posted: January 08, 2006 at 10:42 AM
Yes, it is a known problem with the 457G. I've had some that will unlock but not lock the rear hatch. Make sure the 457G has a solid ground not shared by anything else. For a while they were shipping 457G's with a diode that was supposed to make things better. It was supposed to go on the ground wire, band away from the 457G. Another alternative would be a 455G and 555L. Together they will do the job with no problems....
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Mike M2
Tech Manager
CS Dealer Services
Posted By: Mike M2
Date Posted: January 08, 2006 at 10:47 AM
Oh yea, headlights are easy, white wire at the switch is a negative. directly connect the BLACK/ white off the 712t to this for headlights on after unlock. The reverse lights need a relay, they are a light green positive found at the BCM under the rear seat...
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Mike M2
Tech Manager
CS Dealer Services
Posted By: sparkie
Date Posted: January 08, 2006 at 11:17 AM
Use a GMDLBP and it will do everything including perimeter lighting.
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sparky
Posted By: chriswallace187
Date Posted: January 08, 2006 at 11:44 AM
You can also go into the rear hatch and try to wire the motor leads as reverse polarity...this is what DEI says to do when the data interface isn't available. Their diagram for it is here.
I forgot to say...I'd also diode isolate the databus lock and unlock inputs from the wires going to the rear hatch if you do that. ------------- C Renner's Auto Electronix
My service is cheap, quick, and good - pick any two
Posted By: bigdaddy96
Date Posted: January 08, 2006 at 11:47 AM
The data wire HAS to be SOLDERED 6-8 inches away from the OBD connector. Ducatidesmo is correct. It was not programmed correctly. Unplug the harness and short the pins to drain the caps. Press and hold the momentary button while plugging the connector back in. Ignition on until the LED flashes, then crank the starter and the LED should turn off.
Posted By: tahawus84
Date Posted: January 08, 2006 at 5:07 PM
Ok I programmed the 457 and I do have the purple soldered in about 6 inches from the obd connector. The rear latch will unlock but will not lock. If I use the button on the driver door it will lock. Also does the 457 interface with the headlamps and horn though the purple wire or do i need to wire that in seperatly?
Posted By: tahawus84
Date Posted: January 08, 2006 at 5:10 PM
Thanks for the help guys. Where can I find the GMDL-BP ?
Posted By: JWorm
Date Posted: January 09, 2006 at 9:19 AM
tahawus84 wrote:
Thanks for the help guys. Where can I find the GMDL-BP ?
You try searching google for a GMDL-BP?
A result on the first page.
Posted By: tom badger
Date Posted: January 10, 2006 at 12:59 AM
If the rear hatch locks & unlocks with the factory power lock/unlock switch in the front doors and/or with the factory remote, then the 457G should operate the hatch lock also. Try installing a diode (with band side away from the 457G) in the black (ground) wire and reprogram the 457G by unplugging the harness for 1 minute, then press the black button and hold, plug in the harness (the LED will light up), start the car (the LED will flash) shut off the car. Try the locks from your new keyless. All doors should lock and unlock.
If that doesn't do it, check to see if you have voltage on each of the rear hatch actuator wires when you hit the lock and unlock button. One wire should show positive voltage on lock, the other on unlock. If you have voltage only one way (either lock or unlock), or if the same wire shows a positive voltage reading regardless of whether you hit the lock or unlock button, then check for a broken wire going to the actuator. Also, it could be the actuator itself - unplug it and check across the actuator terminals to make sure you have continuity with an ohm meter.
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The Badger
Posted By: tahawus84
Date Posted: February 10, 2006 at 7:37 PM
i bought a GMDL-BP and got it hooked up and everything works except the exterior lighting. horn honks and all locks lock and unlock fine. What did i do wrong?
Posted By: chriswallace187
Date Posted: February 11, 2006 at 5:44 PM
Bypasskit's own website doesn't mention the perimeter lighting at all...it does do dome supervision. ------------- C Renner's Auto Electronix
My service is cheap, quick, and good - pick any two
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