72 Monte Carlo door lock problem

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=49151
Printed Date: May 14, 2025 at 5:02 PM

Topic: 72 Monte Carlo door lock problem

Posted By: turbonaolds
Subject: 72 Monte Carlo door lock problem
Date Posted: February 01, 2005 at 10:12 PM

I am trying to replace an old alram with a slightly newer one in my 72 Monte Carlo.

The car originally came with power locks. The old alarm was wired to some relays (Bosch 20/30) behind the door. The door locks functioned fine with it. I hooked up a Viper C60 today and the doors won't lock or unlock nor will the alarm set when the doors are shut. Everything works fine if the door is open. I did connect the wiring the same as the old alarm (bith had the connections marked the same.

I have been messing with this most of the day and tried different thing but same result or nothing.

I will go out and try to get more info now as far as how it was connected and add but if anyone has any ideas let me know.

Thanks,

Jason

Replies:

Posted By: turbonaolds
Date Posted: February 01, 2005 at 10:42 PM

here is the schematic on the bottom of the brain;

Harness 1

orange: (-)ground when armed

white (+) light flash output

Blue/white: (-)low voltage output

gray: (-) valet switch

Green: (-) door switch input ------ NOT CONNECTED! Tried to connect to relay or in place of other wires but nothing works

Blue: (-) sensor switch input zone 3

violet: (+) Door switch input (zone 3)

Black: chassis grnd

Yellow: (+) switched 12 volt

Brown: (+) siren output

Red: (+) 12 v

RED / White: (-) channel 2 output -------NOT CONNECTED

Harness 2 Bottom Row;

(A) Brown; unlock #87A, normally closed

(B) Violet; unlock #87 norm open input ---------Used (also connected to (E) - connected to door pin switch

(D) White: lock, #87A, normally closed

(E)Violet; lock #87, normally open input

(F) Green; lock #30, common output------------Used- connected to Relay

TOP ROW;

G/H; green, starter kill #1

J/K; green, starter kill #2

L; White (-) Courtesy output (30 sec)

M; WHITE/ Blue; Channel 3 output

Relays are Bosch part # 0 332 204 150

Locks work fine by door switch.

I know I am missing somehing simple please don't be afraid to point it out guys.

Posted By: turbonaolds
Date Posted: February 02, 2005 at 12:43 AM

posted_image

I was looking at this and these appear to be the relays I have. On my relays they were already wired as both #86 going to the alarm output wires could this be the problem?

Posted By: KarTuneMan
Date Posted: February 02, 2005 at 10:39 AM

85 and 86 can be flip flopped. Its done like that in the picture to make it easier to hook wires too.....Imagin what a mess it would look like if on both relays as they sit here, you tried to sneak 12 volts to 87 and 85 on both, also the trigger wir being on both 86...it would be a mess

85 and 86 control the power coil inside the relay,and poarity is NOT an issue. See the can be flip flopped

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Posted By: turbonaolds
Date Posted: February 03, 2005 at 1:47 AM

I found it! I switched the wires to resemble the diagram and then found I had the violet wire connected to the pin lock instead of the green (-) trigger lead. Connected violet to ground and all works fine. This was my first alarm install ever.

Thanks for the help. Nice site you have here I learned alot last night searching for my problem.