Cruise Control not working.
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Hi
I have provided the brake pedal switch information in forum thread (post# 8 - has a photo of the part and removal/install instructions):
https://www.jaguarforums.com/forum/x...n-light-76654/
This switch is used for brake lights coming on and off, it is also part of the cruise control system.
Jim Lombardi
I have provided the brake pedal switch information in forum thread (post# 8 - has a photo of the part and removal/install instructions):
https://www.jaguarforums.com/forum/x...n-light-76654/
This switch is used for brake lights coming on and off, it is also part of the cruise control system.
Jim Lombardi
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I just bought a '99 XJ8 and couldn't figure out why the cruise didn't work. The answer was that there is a crusie control master on/off switch mounted just to the rear of the gear shift lever. It's the one one the left that looks like it has a graphic for a tachometer on it, to the left of the one with an "S" on it.
I've seen Hondas with such a switch and always figured it was something the lawyers advised so they wouldn't get sued by someone who made a big booboo. There is no other need I can think of for that switch. I guess you could call it a "safety lock" so maybe it's not a bad idea in some situations.
I've seen Hondas with such a switch and always figured it was something the lawyers advised so they wouldn't get sued by someone who made a big booboo. There is no other need I can think of for that switch. I guess you could call it a "safety lock" so maybe it's not a bad idea in some situations.
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BTW WD40 isn't very good for cleaning electronic switches except in a pinch. It works at first and them turns into a sludge that isn't good. The best stuff (really the only stuff I like) is Deoxit D5. There is no other product that I know of that is as good. THE stuff for audio connections, the only stuff I've seen recommended over and over by high end music recording gear manufacturers.
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Hi
Here is a PDF on intake air distribution (see page 10 about Supercharger inlet air vacuum feed fuel rail pressure regulator and cruise control system).
98 XJ (X308) Intake Air Distribution.pdf
Also here is a JPEG file showing the SC By-Pass Valve fully installed with vacuum line attached (provided by forum member xjrguy):
![](https://www.jaguarforums.com/forum/attachments/xj-x308-xj8-xjr-27/16426d1327693091-xjr-vacuum-line-diagram-aj26-bypass-actuator-jpg)
Jim Lombardi
Here is a PDF on intake air distribution (see page 10 about Supercharger inlet air vacuum feed fuel rail pressure regulator and cruise control system).
98 XJ (X308) Intake Air Distribution.pdf
Also here is a JPEG file showing the SC By-Pass Valve fully installed with vacuum line attached (provided by forum member xjrguy):
Jim Lombardi
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I've got a 1998 XJ8 that is having the Cruise not working. It has the problem that looses power to the little on-off switch. Light won't light up at all when the cruise quits.The Limp home comes on as well. If I stop restart it works right for who knows how long? I can't find anyone who I've found who states the same problems.
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Vacuum hoses were good, drove the car 12 miles, after 4 the light on the on-off switch on console went off. The Indicator on dash said of engine problem and limp home. Pulled car over turned key off for 10 seconds restarted and drove the rest of the way ok. Returned home on Interstate and Cruise did well. I've removed battery cable to re-boot to no help....any Ideas?
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Trouble shooting the cruise control system is a bear if there are any codes. Since CEL and limp home were displayed there is a good chance you have a stored code or two. Have the codes read by one of your local auto parts stores.
If there aren't any codes you will have to use the circuit diagrams from JTIS21, which you can download from the sticky's.
You say the light on the cc button is out when the failure occurs. I checked the electrical guide and found that the switch is powered by the GW wire from fuse #14 in the left hand healboard fuse box. Check there first. If you have power there and the the light is out, you may have an intermittent fault in the switch.
That at least gives you a starting point.
If there aren't any codes you will have to use the circuit diagrams from JTIS21, which you can download from the sticky's.
You say the light on the cc button is out when the failure occurs. I checked the electrical guide and found that the switch is powered by the GW wire from fuse #14 in the left hand healboard fuse box. Check there first. If you have power there and the the light is out, you may have an intermittent fault in the switch.
That at least gives you a starting point.
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