95 mustang GT 5.0 no anti-theft module but THEFT light constantly on, WHY.

akaNYr · Jan 15, 2023

Hi guys! I don't understand why I have my theft light constantly on in my 95 mustang, when I don't even have the anti-theft module. I don't even have a chipped key to stop the car. I have a regular ignition. If anybody can answer this and tell me how to shut off this light I would very much appreciate it.

General karthief · Jan 15, 2023

Did you just get this car or did the light just come on one day?

akaNYr · Jan 15, 2023

Thanks for the reply. I've had the car 6 years, you've helped me in the past. The light was on when I got in it this morning to go to work. The stranger part is I also have an 02 V6 mustang. That one does have the anti-theft module and the chip key and that anti-theft light was on this morning too. It must be contagious, LOL.

General karthief · Jan 15, 2023

Disconnect the battery for like 30 min or more and then hook the battery back up, see if that don't reset it on the 95, I don't know about the 02, I think it may be different to deal with.
Anti theft, IIRC, was an option in 95, I believe it's in the trunk drivers side behind the panel.

akaNYr · Jan 15, 2023

Yes the bracket is there but not the anti theft module itself. I read how to reset the '02 anti theft unit. NOW HERES THE REALLY WEIRD PART! Coming home from work tonight, three blocks from my house, I looked down at the dashboard and the anti-theft light is off on the 95 mustang! I pull into the driveway and I went to go reset the O2 mustang the light.. and it was already off!!!!! I'm thinking Gremlins are doing it. LOL. Thank you again for your interest in me. helping me

akaNYr · Jan 18, 2023

Their baaaaack! I think their poltergeists living in my '95 mustang. I need a color schematic for the anti theft system in a 1995 mustang GT 5.0. There must be a short, the THEFT light goes on and off at random, although I don't know how since I don't have the anti-theft module. This has never happened before and I've had the car 6 years. I wish I did have anti theft when the car got stolen last year. For the 3 weeks it was gone I kept thinking I would probably get it back wrecked, it was totaled by my ins. company!

General karthief · Jan 18, 2023

What was damaged?

Noobz347 · Jan 18, 2023

akaNYr said:
Their baaaaack! I think their poltergeists living in my '95 mustang. I need a color schematic for the anti theft system in a 1995 mustang GT 5.0. There must be a short, the THEFT light goes on and off at random, although I don't know how since I don't have the anti-theft module. This has never happened before and I've had the car 6 years. I wish I did have anti theft when the car got stolen last year. For the 3 weeks it was gone I kept thinking I would probably get it back wrecked, it was totaled by my ins. company!

For grins, check all of your door/hatch/hood switches. Inspect the wires and contacts carefully.

I suspect that one or more is intermittent.

TwoRockTwo · Jan 21, 2023

akaNYr said:
Their baaaaack! I think their poltergeists living in my '95 mustang. I need a color schematic for the anti theft system in a 1995 mustang GT 5.0. There must be a short, the THEFT light goes on and off at random, although I don't know how since I don't have the anti-theft module. This has never happened before and I've had the car 6 years. I wish I did have anti theft when the car got stolen last year. For the 3 weeks it was gone I kept thinking I would probably get it back wrecked, it was totaled by my ins. company!

Do you have keyless entry?
The anti-theft module was rare for that model, it was not passive, meaning a chipped key. It was actually just an alarm system installed in production, not the CODE alarm systems installed at the dealership.
You would see the modules in the trunk area, and the car would definitely have to have remote keyless entry (RKE).

Cars without the alarm module did not even have a bulb in that slot. So, have you had the cluster out? LED bulb conversion? Aftermarket gauge faces?

TwoRockTwo · Jan 22, 2023

I have to admit when I get something wrong, so here goes.
I pulled 2 clusters out yesterday from 94 v6’s and both had the bulb in place for the Theft. (Neither had the low coolant or low oil bulbs)

I would look at the back of the cluster on the pcb for any evidence of shorting and the harness, maybe it’s being rubbed and grounding the signal wire.

Photo below should help you out.
The Theft “signal” is #3 on the right side connector looking at the back of the cluster.

It is supplied with constant batt voltage through the speedometer, which is #4

Since you don’t have the module to send the ground signal, I would bet it’s a bare section of wire.

akaNYr · Jan 28, 2023

General karthief said:
What was damaged?

He tore out the ignition and the ignition housing area. There's a broken key stuck in the trunk lock. Passenger side headliners torn out down to the metal of the roof. And other various cosmetic fixes. Hopefully I copied and pasted the link to the picture of the damaged ignition housing.

https://stangnet.com/mustang-forums/attachments/350c98c0-e9a2-47a4-8444-390f4ab3f198-jpeg.690279/

General karthief said:
What was damaged?

akaNYr · Jan 28, 2023

Noobz347 said:
For grins, check all of your door/hatch/hood switches. Inspect the wires and contacts carefully.

I suspect that one or more is intermittent.

Ok thanks I'll check them

akaNYr · Jan 28, 2023

akaNYr said:
Ok thanks I'll check them

Noobz347 · Jan 28, 2023

akaNYr said:
He tore out the ignition and the ignition housing area. There's a broken key stuck in the trunk lock. Passenger side headliners torn out down to the metal of the roof. And other various cosmetic fixes. Hopefully I copied and pasted the link to the picture of the damaged ignition housing.

https://stangnet.com/mustang-forums/attachments/350c98c0-e9a2-47a4-8444-390f4ab3f198-jpeg.690279/

You need to start looking at the junkyards for a steering column. That one looks to me like it is 100% hosed.

akaNYr · Feb 17, 2023

Believe it or not...I fixed the old ignition housing. Most of the pieces were on the floor. I wrapped the new ignition in Teflon tape and wired the housing pieces together. Then put JB Weld extra strength around the area that I had put back together informed a new ignition housing. It's been working fine for a year now.
I have no keyless entry, no anti theft module in trunk, no LED bulb conversion and no aftermarket gauges. I had the cluster out when I changed the bulbs to colored ones to match the car, that was 2 years ago.
Recently there's been another addition to the light problem. When I use the left blinker the headlights blink with the signal light. If the headlights are already on when I put on the blinker, the headlights get brighter and dimmer with the blinker. If I use the right signal it works fine, no blinking headlights.
The guy at AutoZone said that I should tighten my alternator belt. Battery reads 13.99 with blinker/headers going. Isn't the alt belt self-adjusting?
My brother and I are thinking the issue is in the turn signal arm. Since the the hi beam and signal are blinking together and both are located in the same arm lever.

TwoRockTwo · Feb 17, 2023

Yeah, that issue sounds like the multifunction switch, since all of those circuits meet there.
Usually you can see evidence of overheating/ melting on the plug / switch connector

95 mustang GT 5.0 no anti-theft module but THEFT light constantly on, WHY.

akaNYr

General karthief

wonder how much it would cost to ship you a pair

akaNYr

General karthief

wonder how much it would cost to ship you a pair

akaNYr

akaNYr

General karthief

wonder how much it would cost to ship you a pair

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95 mustang GT 5.0 no anti-theft module but THEFT light constantly on, WHY.

wonder how much it would cost to ship you a pair

wonder how much it would cost to ship you a pair

wonder how much it would cost to ship you a pair

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