"Starting Disabled" 95 STS Aftermarket Remote Start

[lowmon]

I have a no start situation with an aftermarket remote start. This setup has the resistor bypass in place.

I am thinking I may have a Universal Theft Deterrent Module failure. But I want to eliminate some suspects.

Theft system only gives No Start signal, I saw in the posts a reference to a fusible link B feeding the battery input, any idea of this location.

Also found references to Theft Relays in trunk. Any info on these would be helpful.

I did remove the module to check for bad solder joints (Battery Disconnected of couse). Gave it a once over and re-installed.

Prior to this post (last week) I did go to the local dealer for help to locate the theft module and he pointed out what turned out to be a PassKey Module, which I did replace. I was looking through my manual and noticed that the trunk diagram for the Deville showed my same layout. That is when I realized that the Theft Module and PassKey Module were not one in the same and located opposite on seat wall in trunk. ---Unnecessary cost for non-returnable part.

As a help for some of the parts search: GMPartsDirect.com is a source for replacement parts. To save a little over the dealer just take a part number and do a search for a competitive price or maybe not. Not all parts show up in their online catalog. May be a good tip for some.

[jfreezn]

All,

I have been studying the anti theft features of the 93-94 STS/Eldorado, with the Northstar engine.

The 95 is probably the same.

It is my belief that the no start originates in the passkey module, rather than the anti-theft module. For expample: does your engine start using the key in the ignition? Or is your problem only with remote starting? The passkey module has the capability of sending a fuel cut off signal to the PCM, allowing the engine to crank, but it will not start.

The Passkey module is looking for the correct resistance pellet, which you have bypassed by inserting a correct external resistor in the sensor loop. the Passkey also issues a no crank signal too, but this is only to prevent grinding the starter with the engine already running.

The theft deterrent module merely watches the doors, trunk, and hood, and sounds an alarm and flashes the lights if violated. I don't see any way it can prevent the engine from starting.

Let's keep this discussion going.

Jim in Phoenix.

I have a no start situation with an aftermarket remote start. This setup has the resistor bypass in place.

am thinking I may have a Universal Theft Deterrent Module failure. But I want to eliminate some suspects.

Theft system only gives No Start signal, I saw in the posts a reference to a fusible link B feeding the battery input, any idea of this location.

Also found references to Theft Relays in trunk. Any info on these would be helpful.

I did remove the module to check for bad solder joints (Battery Disconnected of couse). Gave it a once over and re-installed.

Prior to this post (last week) I did go to the local dealer for help to locate the theft module and he pointed out what turned out to be a PassKey Module, which I did replace. I was looking through my manual and noticed that the trunk diagram for the Deville showed my same layout. That is when I realized that the Theft Module and PassKey Module were not one in the same and located opposite on seat wall in trunk. ---Unnecessary cost for non-returnable part.

As a help for some of the parts search: GMPartsDirect.com is a source for replacement parts. To save a little over the dealer just take a part number and do a search for a competitive price or maybe not. Not all parts show up in their online catalog. May be a good tip for some.

[lowmon]

No start with key in ignition. The aftermarket remote was in the vehicle when I bought it at 4yrs old.

I did try a remote start at one time when this problem surfaced several weeks ago. In the remote mode it did attempt a start, ran a few seconds and then died. Then by default one or two more start events occured with the same result. I haven't done a remote start attempt since that time. Overall I rarely do use the remote accept during the chill of winter.

I did replace the Passkey module but no change.

This part did not come with any documentation so I had the key in the ignition upon install thinking that the resistor and key in place as a combo would be necessary when the battery was re-attached.

Also replaced EPROM with replacement from dealer hoping this would contribute to a fix. The car has been problematic with other issues as in ISC motor needing to be unplugged, EGR issues, and the PCM has been replaced 6-7 months back.

I have seen reference to a faulty battery charge as an issue. So today I will try a known good battery. Even though I did have the out of service car on a charger, the crank in the No-Start mode seemed week.

[alwing17]

Usually with the addition of a remote start,the Pass-Key system is disabled by unplugging the 2 way connector under the steering column,usually has a orange insulation and 2 white wires,and adding a resistor to jumper the 2 wires going to the Pass-Key module.You might want to see if there is a resistor there,it might have gone bad. Remove it,and plug the connector in from the lock cylinder,and then try to start it.If it dosen't start,plug your old module in and try again. The reason for this is the new module "learns" the existing resistance of the old key and burns itself in to that resistance value.

All,

I have been studying the anti theft features of the 93-94 STS/Eldorado, with the Northstar engine.

The 95 is probably the same.

It is my belief that the no start originates in the passkey module, rather than the anti-theft module. For expample: does your engine start using the key in the ignition? Or is your problem only with remote starting? The passkey module has the capability of sending a fuel cut off signal to the PCM, allowing the engine to crank, but it will not start.

The Passkey module is looking for the correct resistance pellet, which you have bypassed by inserting a correct external resistor in the sensor loop. the Passkey also issues a no crank signal too, but this is only to prevent grinding the starter with the engine already running.

The theft deterrent module merely watches the doors, trunk, and hood, and sounds an alarm and flashes the lights if violated. I don't see any way it can prevent the engine from starting.

Let's keep this discussion going.

Jim in Phoenix.

I have a no start situation with an aftermarket remote start. This setup has the resistor bypass in place.

am thinking I may have a Universal Theft Deterrent Module failure. But I want to eliminate some suspects.

Theft system only gives No Start signal, I saw in the posts a reference to a fusible link B feeding the battery input, any idea of this location.

Also found references to Theft Relays in trunk. Any info on these would be helpful.

I did remove the module to check for bad solder joints (Battery Disconnected of couse). Gave it a once over and re-installed.

Prior to this post (last week) I did go to the local dealer for help to locate the theft module and he pointed out what turned out to be a PassKey Module, which I did replace. I was looking through my manual and noticed that the trunk diagram for the Deville showed my same layout. That is when I realized that the Theft Module and PassKey Module were not one in the same and located opposite on seat wall in trunk. ---Unnecessary cost for non-returnable part.

As a help for some of the parts search: GMPartsDirect.com is a source for replacement parts. To save a little over the dealer just take a part number and do a search for a competitive price or maybe not. Not all parts show up in their online catalog. May be a good tip for some.

Pass-Key disables the starter circuit,the newer Pass-Lock systems will allow the engine to crank,but shuts the injector drivers in the PCM down,hence the crank,no start condition. Also the theft deterrant or security light will flash.

[lowmon]

Yes there is a resistor in place. It does have the correct resistance to match my key pellet. I did re-attach the cylinder circuit but no change. I also installed a new resistor in line that matched my key pellet.

I have tried a known good battery, same result. The reason it could point to replacement of the theft module is based on information from the article linked below.

http://www.motorage.com/motorage/article/a...l.jsp?id=169809

[lowmon]

Finally took it in to the dealer where the service tech was able to get it to start. Found the problem to be with reman PCM . Put it in place but new Codes are up T077 as well as others. But after $700+ for new ignition and diagnostics to that point I will need to find time to get to the bottom of it. Probably the new PCM is faulty or a bad ground maybe.

Now with key in "ON" engine cold and not running the cooling fans kick on at full. Also speedometer does not work and stays at "0" so I am driving by tach. I think it may be defaulted to 2-3 gear so no highway driving for now as the idle won't always settle down. Exhaust will smoke at start sometimes leaving sooty exhaust tips. With the speedo not working I have not gained any mileage on my Odometer. The inside AC system will only blow at high speed too but no cool air, so I have the sytem OFF and use windows for cooling. At least I have a backup vehichle until I can get to it.