This is where you need to come in and design something that turns off everything except the alarm /immobiliser system.;)
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I know there was definitely some mods done to my car early on when I didn't own it by the dealer.
It had something to do with shedding power.
I think it was some item right near the battery.
Mines a MY10 TDV8.
Since I've owned it I've also updated all the firmware in the different ECUs with my iid tool with their help.
I just had to pay them money but it wasn't much.
I don't seem to get many errors in my car anymore.
Only the occasional communication error to the park brake module.
And a communication error to the drivers seat heater.
But they don't seem to affect anything and can be easily cleared.
So double check there's no recalls or mods the dealer needs to do.
And check if any built in computers need updates.
This can be done by the dealer or the guys at iid tool.
Blade how much was the IID update?
I just sent you a PM. It wasn't too expensive but I may have been a test case. There was about 12 firmwares for ECUs in mine that were old. You have to be very careful and read all instructions and make sure your battery is fully charged. I'm sure the dealer could do it too but may charge more.
I'm not sure if the gap iid tool supports 2003 models? Where do you live Shirley?
Graeme Cooper automotive may be able to help.
Ok so yes it does support your car.
Range Rover L322 2002-12
Just not sure if they would do updates for it though???
Also Shirley log into topix and enter your cars Vin number.
Double check there's no outstanding recalls.
My later model had a recal Q159 for this same type of problem.