84 security wont let engine start

Reply Subscribe

Thread Tools

Search this Thread

Jun 18, 2017 | 05:38 PM

Adam2980

Thread Starter

Heel & Toe

Joined: Dec 2016

Posts: 20

Likes: 0

From: Canton New York

84 security wont let engine start

Hi,
I just recently took out and rebuilt my engine for my 84 C4. It is back in and hooked up and ready to go, or so I thought. I get in the car and put the key in. "Security" flashes on the DIC. I turn the key to run and the "Security" light goes off. When I turn the key to start the engine, the "Security" light comes on and the engine will not start. I did some searching on here and saw people talking about the door locks controlling the security system. So I put the key in, but did not turn it at all. If the doors are un-locked, the "Security" will flash, if the doors are locked, the "Security" will be light solid. I also saw some people saying that the stock radio could be part of the security system, but I don't believe that because when I bought the car, it already had an aftermarket radio and it ran just fine. I am at a total loss. I hope there is a simple solution, but if not I am willing to bypass the security system as a last resort, but I don't quite know how to do that. Any information would be gratefully appreciated.

Adam

Jun 18, 2017 | 05:57 PM

MikeP84

Racer

Joined: Jun 2017

Posts: 311

Likes: 24

From: Ohio

The locks do contribute to the system. Mine in my 84 have to be turned in one direction to trurn off the alarm and then turned the other way to unlock the door. I would try to get them moving.

Jun 18, 2017 | 06:01 PM

JoBy

Melting Slicks

Joined: Mar 2001

Posts: 2,150

Likes: 304

From: Timra, Sweden

Unlock door with key to disarm.

Does the engine crank over? The theft deterrent system will disable the starter.

Jun 18, 2017 | 06:05 PM

Adam2980

Thread Starter

Heel & Toe

Joined: Dec 2016

Posts: 20

Likes: 0

From: Canton New York

Quote:

Originally Posted by MikeP84

The locks do contribute to the system. Mine in my 84 have to be turned in one direction to trurn off the alarm and then turned the other way to unlock the door. I would try to get them moving.

The door locks work fine. I tried that. Locked it un locked it, by key and by power locks, No change.

Jun 18, 2017 | 06:06 PM

Adam2980

Thread Starter

Heel & Toe

Joined: Dec 2016

Posts: 20

Likes: 0

From: Canton New York

Quote:

Originally Posted by JoBy

Unlock door with key to disarm.

Does the engine crank over? The theft deterrent system will disable the starter.

Thanks for the diagrams. That should be helpfull if I have to bypass the security system. To your question, no the engine does not crank.

Jun 19, 2017 | 02:19 AM

JoBy

Melting Slicks

Joined: Mar 2001

Posts: 2,150

Likes: 304

From: Timra, Sweden

Quote:

Originally Posted by Adam2980

The door locks work fine. I tried that. Locked it un locked it, by key and by power locks, No change.

There is an extra switch up in the door lock for theft deterrent. If the actual key locks work does not matter. Unlocking with power locks will not disarm.

Try with the key on both left and right doors.

If you open door, lock with power locks, the security should change from flashing to on. Close door and it is armed.

Jun 23, 2017 | 07:18 AM

Gibbles

Drifting

Joined: Mar 2015

Posts: 1,275

Likes: 165

From: Utah

If you don't have one yet, get the factory service manual.
you can find them all day long on ebay.
also pick up the electrical supplement manual.

It goes into much better detail, and covers locations better.

Jun 24, 2017 | 11:20 AM

knikula

Instructor

Joined: Jun 2015

Posts: 128

Likes: 13

check to make sure that green wire with the white stripe running to the theft deterrent starter interrupt relay has power to it on pins c and d when the key is in the start position. If it does not, you have a different problem, like a neutral safety switch. my manual seems to show the relay on the passenger footwell, but I have not gone looking for it yet.