2008
XKR 4.2
Convertible

After battery change and several drives and Re-Learns intermittently it will not crank. Only fix I have figured out is battery disconnect and wait, do the relearn sequence and then its fine for a few drives/starts. So I dove into Service Manual and Starter circuit shows its activating Relay10 directly to the starter. I checked all 3 Fuse Boxes and none have a Relay 10 spot. Ive seen many 1,2,3, 4 and even an 8 but no R10. I really want to wire in a momentary switch for this for the next time so I dont have to strip the trunk and relearn all over again.

 

That’s an interesting situation. May we see what codes you’re throwing before the reset?

 

I cleared them all, inst cluster comm failure code seems to be very regular, but inst cluster has NEVER not functioned. It shows everything its supposed to (lites, gauges, warnings, low key batt, clock etc), . But I've had that same code for years because the steering colum does not lock so that code is there regularly also and neither can be cleared with my D7 scan tool.

Only strange think is my scanner shows brake switch being depressed/actuated on or off. So I know bcm is seeing brake depression, but when its acting up and I depress and press to start it does not show bcm requesting start/crank.

I'd really rather just put in a momentary switch to jump the start solenoid rather than chasing down the rabbit hole on why it needs a battery reset so often.
3rd time in as many uses.

Dan
08 XKR
Convertible

 

I'll write them down next time it happens. I just so PO'd the last time I just wanted to start and leave that location.

 

Thanks for the reply, just very frustrating to an old wrench.

 

I'm sure you're aware that the very first pinpoint test is confirm the battery health. Simplest wat is a voltage reading 6 hours after any charging event (ie car running or maintainer attached)

 

is probably located on the underside of the engine compartment fuse box.

https://www.jaguarforums.com/forum/x...-relay-292856/