Zitat:
@Lightningman schrieb am 21. August 2023 um 09:20:12 Uhr:
I assume that something is triggering the J843, which in turn tells the contol unit #5 (immobilizer) to prevent terminal 15 (ignition on) from being turned on. If you disconnect & reconnect the J843, then you are basically resetting it. As long as it doesn't get triggered again, everything works as it should.
J843 is part of the immo circuitry. That is why you can't simply remove it or exchange it for another unit. What you could try, is to remove it (J843) and take it out of the gateway install list. Then have a dealership relearn all your keys to the immo. It might work. However, there maybe coding adjustments to make in other control units. My A6 doesn't have the J843, so I can't check. The J843 is just the interface "into" the car. It doesn't have any connections to the "outside" world (for remote vehicle shutdown). This is an additional control unit, that was only installed in A8 (4H) cars. It never saw an installation on the A6.
What I tried yesterday was coding the J843 module. I have turned off all bits so nothing is enabled and it seems to be working so far, I think. We have errors in J843 for insufficient voltage, but no more terminal 15 fault in the BCM or the J843 module.
Maybe you can try this?
I was unable to locate the module in the car for us to reset it, I assumed it is near the battery but no luck finding it.
