Immobilizer question Topic is solved

[subzerocarfanatic]

So far I have not found any loose chassis ground. Still looking and praying I can figure this gremlin out. It has to be something simple because the car starts and runs fine as long as I pull the Ignition fuse each time before starting, but who wants to do that every time. (

If you leave the key in the ignition and open the door, does your key reminder chime 'chime'?

Yes it does, when I pull the 15 amp fuse that is labeled ignition switch contact system (that I have to remove and reinstall to get the car to start) the door chime stops when the fuse is removed. It seems to me these are tied together to my problem somehow I just have not figured it out yet, I have had this frustrating issue for over a year, having to pull the fuse every single time before I can start and drive the car.
I have a question, should the fuses and relays in the kidney shaped fuse box on shock tower, should they have same voltage as battery even when key is off ?

[abscate]

It should be either 0 Volts or within 0.1 V of the battery voltage across the terminals

[subzerocarfanatic]

This isn’t an antenna ring problem. Pulling that fuse is probably doing an ECU reset which helps the starting sequence.

If cranking is inhibited on a 1999 or 2000 car, your light control module , 2/76 is not grounding your starter relay. It does this under microprocessor control , not a simple thing to diagnose.

If it cranks, starts, stalls…that’s a bad key signal.

abscate, could a software related issue cause the car to only start if the 15 AMP ignition switch contact system fuse is removed then reinstalled as I mentioned? I found with the AUTEL MaxiPro MP808 scanner that it has a few DTC , one being DIM-000D communication, ECM; Internal fault. I looked it up and it mentions something about ECM software. I do not understand why the software would have issues!
You mentioned the ECM earlier, so maybe pulling that ignition fuse each time then re-installing it is resetting a signal to the ECM so it lets it start, I need to figure out what is causing it and why!! Could a software issue cause this, if so what would cause the software to have an issue and if so why would the car run at all even with me resetting it by pulling and reinstalling the fuse?

[subzerocarfanatic]

I checked the fuses in the kidney shaped fuse box, the only one that has battery voltage to it when key is off is the very first 15 AMP fuse, which is the ignition contact system fuse that I have to pull and reinstall each time before turning the key on so the car will start.

[abscate]

Cranking is enabled by the 2/76 light control module. If it isn’t cranking without the fuse pull, that’s where I would look. The immobilized will allow cranking but the engine won’t fire.

[subzerocarfanatic]

Here are a few of the DTC I pulled.

[subzerocarfanatic]

More codes

I know the CAB ones are all convertible top related but thought I would include them.

[wizechatmgr]

Do you have another key and antenna ring you can try?

[subzerocarfanatic]

Do you have another key and antenna ring you can try?

No, i wanted to make sure that was a problem before buying one, I have it in my cart on volvo swag's website. $51.50.
The images i posted were from the Autel MaxiPro MP808 scanner, I just got finished running my Volvo Vida Dice and here is what it pulled up. I will post images.

[subzerocarfanatic]

VIDA Dice scan results. 2nd image is the ETM test results, i just wanted to confirm that the electronic throttle module was functioning and the 2 potentiometers were in sync within acceptable range and it was, 4.3% difference at most.
Whatever is going on that I have to pull the ignition switch contact system fuse to start car each time also is what is keeping the ETS dash check light that has to come on for the ETM to work, from coming on. The car will not start without the ETM related ETS dash light coming on briefly . So when I pull the fuse and reinsert it it resets the ECM and the ETM somehow and then the ETS light comes on and it starts every time.
The ECM fault code I believe is a software related issue which I do not understand, I have never programmed it it any way, only the used XEMODEX ETM put in 2 years ago was updated I think when it was installed and it started right up. Could that some how have affected the ECM software???