1998 Jaguar XJ8 Window Sunroof Reset

JAGUAR XJ8
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ROBERTAHRENDT
  • MEMBER
  • 1 POST
1998 Jagaur XJ8 with 101,000 miles

I just bought this car a week ago and the driver side window will not roll down and when i put the sunroof back and a few seconds later it closes. At first i thought it was because i hit the valet mode while test driving it, but i turned it off and both problems continue still. I think i can hear the motor running in the driver side window but i don't know how to take off the door panel to take a look at it from the inside. I don't have the money right now to pay to take it to a dealer so any help is appreciated. Thank you.
Mar 19, 2007 at 11:14 AM
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MJACK01
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  • 1 POST
I have a '98 xj8 that had the same two problems. I found on-line advice to disconnect the positive battery cable fo 30 minutes, and then reconnect. It fixed the driver's window and the sunroof both. Good-luck
Apr 19, 2007 at 10:08 AM
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FSTRANGER302
  • ✓Experienced Mechanic
  • 117 POSTS
[quote:2318b75a26="Mjack01"]I have a '98 xj8 that had the same two problems. I found on-line advice to disconnect the positive battery cable fo 30 minutes, and then reconnect. It fixed the driver's window and the sunroof both. Good-luck[/quote:2318b75a26]doing a resett on the battery is a good start. disconet the battery for 15 minutes put the modules in the car to sleep. what is happening is the module is getting confused. possibly cause the battery voltage is getting low. the modules need exact voltage. if the battery is getting weak and the voltage goes below the threshold, the modules dont act right.
Nov 16, 2007 at 11:00 AM

Suggested Repair

Disconnect the battery for 15 to 30 minutes so the modules can sleep and reset, then reconnect it. Also test battery condition and voltage, since low voltage can confuse the modules and cause the driver window and sunroof to act incorrectly.

Conversation Summary

The owner of a 1998 Jaguar XJ8 reported that the driver window would not roll down, although the motor seemed to run, and the sunroof closed itself shortly after opening. Turning off valet mode did not help. Another owner said disconnecting the positive battery cable for 30 minutes fixed both issues. The expert agreed that a battery reset is a good start, recommending about 15 minutes so the modules sleep, and noted that weak battery voltage can make the modules behave incorrectly.

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