Hello - I own a 2008 Jag XJ8(L) and often times my wiper blades gets stuck in the up position along with an amber colored light (cruise control) stating, “cruise control not available”. These defects operate like this intermittently. Any advice you can share would be appreciated and thanks.

Jerome

 

The wiper problem could well be corroded earths behind the headlights.

Cruise problem could be a wheel sensor on which it depends for a speed signal.

Which country are you in so that I can send you an invoice. lol

Do they salt the roads there?

 

I live in the USA (Louisiana). It’s very hot and humid here during the summer but no salt on the roads.

 

Do you have adaptive cruise control? My "radar" module has failed and I receive the yellow cruise unavailable warning

RyeJag

 

I don't think these two issues are related. Cruise control issues CAN be cause by a failed or failing TPS on the throttle body - happens more on early cars with the the Denso TPS - later cars had a better integration of the TPS with very few failures.

As for the wiper issue - if you do some research on this, you find out that the wiper motor isn't installed into these cars. They start with the wiper motor and build the car around it. Only partly kidding here When I discovered you have to remove the brake booster (large cylindrical vacuum cylinder in front of the brake master cylinder) AND Brake Master Cylinder, and saw picture of someone disassembling all of the parts along the top of the firewall, and fishing out the wiper motor and transmission trough holes that are smaller than the part, I realized that the problem isn't THAT bad after all, lol. You then have to put the brake master cylinder/booster back in and bleed the system.



You will likely gain nothing from experimenting with relays, fuses of ground contacts - though checking the ground is easy enough. Be VERY CAREFUL when re-tightening the nut on those ground studs. They take ONLY just 6.5 lb.-ft. / 9 Nm - that is just a tiny bit of force, really just snugging them down. Ask me how I know! There are DOZENS of comments of people snapping these aluminum studs off that were welded with some process that does not handle ham fisted, big wrench, cave-man brute force. Here is the primary one behind the left headlamp:



What appears to be the common failure, is a contact disk, and the brushes that run upon it losing conductivity, from grease, dirt, wear and moisture. I went looking for you and found the one thread where someone fixed it. You decide if it is worth it for you. In my case, I compared the resale price of my car, and purchase price of a car without this issue, and considered that the appropriate fix.


It took a lot of patience and determination but the gentleman in this tread got to the root issue.

https://www.jaguarforums.com/forum/x...solved-119272/

Mine only stick at the top of the swing are in intermittent and only when the wiper motor is cold and hasn't been used recently. If I run them in continuous for 10-15 seconds, they usually behave and work as designed from that point on. So - for me, this disassembly was not worth it. You will have to decide if you are up for it as a DIY project or paying Jaguar for a good bit of labor - perhaps 2+ hours, and part prices There is no way I would NOT replace the motor with new if going in there to do this.

Good luck, and let us know what direction you end up going.