[tw2005]

Just another question, are you using a multimeter for these checks?

[Shrek73]

The car is Auto. The Auto locksmith had a machine that detected a mag field when the ignition was turned on. This car does not produce one and even with the antenna coil unplugged I have no voltage at the plug everything that is in this circuit has been replaced including the coil. I have no immobiliser light at all it hasn’t come on once since the car stopped starting. I don’t know about any codes when the auto locksmith plugged in his diagnosis tool he said there were no codes. Is there a way I can check without a OBD tool

[Shrek73]

Multimeter and a test light for checking voltage at the plugs and fuses. I would assume it won’t be a full 12v maybe 5 volts but I have the range set low as well as high so I should get something to register I also have a max hold function that will detect a voltage spike

[tw2005]

The car is Auto. The Auto locksmith had a machine that detected a mag field when the ignition was turned on. This car does not produce one and even with the antenna coil unplugged I have no voltage at the plug everything that is in this circuit has been replaced including the coil. I have no immobiliser light at all it hasn’t come on once since the car stopped starting. I don’t know about any codes when the auto locksmith plugged in his diagnosis tool he said there were no codes. Is there a way I can check without a OBD tool

Information not  previous obvious, how I'm reading this saga.

" Once ECU was replaced all checked out ok apart from this issue with no power to the antenna coil"

I was working with IMMO light, no antenna power, not that I fully understand what's going on here

I would follow the fault finding steps I listed and report the results on each

[tw2005]

I presume the Room LP 15a fuse has been checked? Even swap it if you have a spare

[nzenigma]

The car is Auto. The Auto locksmith had a machine that detected a mag field when the ignition was turned on. This car does not produce one and even with the antenna coil unplugged I have no voltage at the plug everything that is in this circuit has been replaced including the coil. I have no immobiliser light at all it hasn’t come on once since the car stopped starting. I don’t know about any codes when the auto locksmith plugged in his diagnosis tool he said there were no codes. Is there a way I can check without a OBD tool

Information not  previous obvious, how I'm reading this saga.

" Once ECU was replaced all checked out ok apart from this issue with no power to the antenna coil"

I was working with IMMO light, no antenna power, not that I fully understand what's going on here

I would follow the fault finding steps I listed and report the results on each