While I was testing the fans after installing the third fan relay, I went for the key to turn the engine off.
I was sitting on the door frame and felt I didn’t turn the key off properly. I look at the cluster and noticed a couple of warning messages, some being the door and hood open and read one for the traction control.
I decided to turn the engine off, but it wouldn’t shut down!
I try a little white grease thinking the mechanism got stuck and also tried turning the key slowly.
Nothing!!
While turning the key to the off position, when I pass toward the 2 position, I could hear something clicking on the passenger side of the car, maybe a relay?
I could even remove the key, I didn’t try to lock the steering wheel, and the engine would not stop. I tried with the extra keys, nothing.
I disconnect the battery, ground first, and the engine keep on running.
I did a quick glance in the forum and found a suggestion to remove the pump relay, found the location in the manual, trunk box number 4 and I pull it out.
The engine stopped and everything went off.

Went inside for lunch, Cochinita tacos with habanero, lime and purple onion salsa and a blond cold beer.

This has never happened before. What did I do lately?
Yesterday I installed the Discount Car Stereo Bluetooth system (between the CD changer and the radio) and today I installed the 3rd fan relay.

Maybe the ECM got enough with the intruders and decided to Lucas on me?
I decided to replace the new relay with the old donor we installed last.
But I found a procedure to do a hard reset and went for it first.

After a few minutes I reconnected the battery, started the car and it run no problems, then turn off the ignition and the engine turn off!
Any ideas?
I’m a little worried installing the RealGauge, will this interfere with the ECM?

 

No. The gauges don't send information or data to the ECM, so the ECM has no idea what is happening upstream from it.

 

I have RealGauge and the Discount Car Stereo bluetooth installed for about a year now and have not had a problem.

I am thinking this may be triggered by the fan relay or a mistake on your part when installing any of these components.


Has it happened again?

 

I can't recall anyone detailing the lunch menu in the middle of a Jaguar crisis. Not a word I have ever needed to use before but that is definitely COOL.

Graham

 

Thanks for the info.

 

Thanks is good to know.

 

Thanks for writing, no, it has not. I will proceed with the Real Guage installation.

 

It was delicious, needed to be mentioned! Thanks for your lines.

 

AFAIK, The XK8s/XKRs use Nipondenso Electrics, Not Lucas.

 

I believe he referenced Lucas as a joke....

 

Exactly! Restore vintage British bikes, used to electric oddities.

 

After installing the Real Gauge I went to the trunk to properly connect the battery, placed the floor cover, close the trunk and went inside the cabin and..





All the instruments were lit, like when you open the switch before cranking the engine. Inserted the key, move it and nothing.

Went back to the trunk, reconnected the negative, went back to the car and everything was off, as it should.

Try to start the car and the engine does not turn, I drained the battery.

Over the weekend I installed the blue tooth and he Real Gauge. I only run the engine for maybe 20 minutes to check the temp gauge movement.

Will a low battery cause electrical problems?

I have the battery on the charger and will test it and replace it if necessary.
If is not the battery should I suspect a bad key switch?

 

YES - number one cause of weird electrical behaviour on these vehicles.

Graham

 

While replacing the battery I found this cables in the corner of trunk by the battery. Any idea what they are for and if they should be connected?




This one is intriguing it looks like it was connected before.





Any information would be appreciate it.

 

Those are the cables used to maintain power to the factory battery during the long sea voyage required to ship the vehicles here to the U.S. You can ignore them....

 

If you are buying lunch, I will come lend a hand????

 

I learned the hard way(Low battery, but still showing charge, many failures), this is an "Electric" car, not a 'gas' car.

 

The instrument cluster connects to both the CAN and SCP network and acts as an interface between the two. Hence why faults on the instrument cluster can cause chaos in the rest of the electronics. You need to be extremely careful when disturbing the connections.

 

You are welcome to visit and lend a hand, we have plenty of beer and projects..

 

We called Autozone ahead to make sure they have a new battery charged and available.
Since is only 5 miles away from home we managed to charge the old battery with a trickle charger. It barely turned the engine enough to start, barely.
In 20 minutes we were driving back home.

There are no current manifestations of electrical issues.

Thanks for your suggestions.