Alarm R/S in 97 Blazer
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=44882
Printed Date: May 16, 2025 at 9:09 AM
Topic: Alarm R/S in 97 Blazer
Posted By: vlepouce
Subject: Alarm R/S in 97 Blazer
Date Posted: December 10, 2004 at 11:20 AM
I am going to install a Viper 791XV in my 1997 Chevy Blazer this weekend. Is there anyone who has any advice? I want to keep as much of the wiring as possible in the cab, not under the hood. After the R/S and alarm are working I am going to pick up a battery backup and a mini siren for in the vehicle. I have a wiring diagram for the blazer and a pin out from the installation manual. My questions are mostly about door switches, rear hatch release, and tach wire. I am not sure of the type of locks on this vehicle. The Blazer does not have remote locks from the factory from what I know. Bought the truck used, and did not get the fob for it. I will know this weekend for sure. The wiring diagram shows that there is white wire running to the tach on the dash coming from the coil. Hoping to solder to it under the dash. Rear defroster seams easy with a relay. Run from alarm to 85, 86 to ground. From switched 12 volts to 30, and 87 to wire leading from switch to vehicle relay for rear defroster? Not sure if positive or negative door locks. Any advice as to what needs a relay and what needs diodes? Everything I have read on this site leads me to believe that this is one of the premiere places for help. Thanks
Replies:
Posted By: SoundFX411
Date Posted: December 10, 2004 at 1:20 PM
your lock wires can be found in either kick panel
LOCK= LT/BLUE
UNLOCK= WHITE
It is a positive door locking system
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SoundFX
Posted By: vlepouce
Date Posted: December 10, 2004 at 1:31 PM
Thanks for the information. Any thoughts or comments on the rear defroster or the tack wires? Thanks
Posted By: SoundFX411
Date Posted: December 10, 2004 at 8:10 PM
the rear defrost has a timer built in and there is no wire color for it.
the tach wire is white. located at the ECM in the passenger side inner fender.
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SoundFX
Posted By: vlepouce
Date Posted: December 11, 2004 at 7:10 AM
Any advice on where to get a good ground? Having problems finding a good ground under the dash. Any idea on the tach wire under the dash going to the tachometer? After starting this, I have newfound respect for professional installers. My wiring diagram shows the tach coming from a white wire on the coil. Unfortunately the only white wire has a black stripe, which runs to the ECM, not the dash. Thanks
Posted By: SoundFX411
Date Posted: December 11, 2004 at 12:10 PM
Unfortunately the tach wire is under the hood. As for the ground, there is a ground connection in the drivers kick panel up high.
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SoundFX
Posted By: Hymer
Date Posted: December 11, 2004 at 12:14 PM
For a 6 cyl. its the wht/ blk at the coil pack on pass side. nbehind the drivers kick panel there should be a factory ground there ground all to one point. Make sure your 2nd ign is kicked on at the correct time, or the check angine lite will come on (usually) and this keeps the tranny from shifting correctly (won't go out of second gear). It needs to fire up at reallitivly the same time as when you twist the key..
Good luck. I just did ine of these the other day... kind of a pain.. stupid lower dash panels have to hang in the way...
Posted By: vlepouce
Date Posted: December 12, 2004 at 1:12 PM
Thanks for the assistance. The only thing I am currently having problems with is locating the lock wires. Still working on it but no luck so far.
Anyone have an idea. The kick panels do not want to come loose. Still trying to find the problem. Thanks
Posted By: Hymer
Date Posted: December 12, 2004 at 9:58 PM
They should be in a harness going over to the center console or mabey the factory keylaess, the box on the topside of the lower dash panel, or snake wires into the door boots and do the connections at the switch harness...
Posted By: vlepouce
Date Posted: December 13, 2004 at 8:41 AM
I will look for that harness. I did find them coming out of the pasenger door finally, but would like avoid running them that far. May have to but will check again one night this week.
I have a couple of additional questions. Door open sensor and hooking up the locks.
Do I need relays to power the door locks?
Having trouble figuring out what wire to use for the door sensor. Read somewhere to use the white wire on the lamp under the dash. Not sure how to verify this.
Thanks
Posted By: Hymer
Date Posted: December 13, 2004 at 7:36 PM
If you have on board relays (viper should) then no. as far as your door open it is white (-) at the keyless module (This wire catches all doors, but reads the delay. To keep the alarm from reading the delay, place a diode in-line on the white door trigger wire with the anode towards the keyless module. Attach your door trigger wire to the cathode side of the diode. On non-keyless models there is a module with 5 wires located where the keyless normally resides. The white wire there catches only the front two doors. To catch the rear doors use the white wire at the drivers side rear pin switch.
Also found at the TRW keyless entry module mounted to the under dash panel on drivers side. With the module unplugged, the drivers door lock will no longer function.)
Hope that helps ya...
Hymer
Posted By: vlepouce
Date Posted: December 14, 2004 at 9:08 PM
Thanks Hymer I finally found a wiring diagram that showed the door lock switches and the factory relays for the solenoids. I will wire the door locks with the wires direct to the wires from the door. If I grab the white from the front door at the module under the kick panel on the drivers side, and from the door switch at the rear door on the drivers side, I think that I should diode isolate both connections and run them back to the door trigger on the alarm. Will this also catch the rear hatch switch? Thanks for the help.
Posted By: vlepouce
Date Posted: December 15, 2004 at 8:43 AM
Forgot to mention that the Blazer does not have factory keyless entry.
Thanks
Posted By: vlepouce
Date Posted: December 15, 2004 at 8:49 PM
Another question. How can I test to see that I have the right wire. Will I see continuity to ground with a door open? Just want to make sure that I am hooking up the correct wires. Thanks
Posted By: Hymer
Date Posted: December 15, 2004 at 9:09 PM
Yep, door open you should see ground, and as for the rear hatch, I can't tell you right now because my computer decided to through a fit and I can't get into my wireing info... very fustrating...
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