"Lights are off" message all the time
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When you have the Auto headlight feature fitted, this warning is normally displayed if the rotary collar is NOT in the auto position and the sensor detects the ambient light level has dropped to the point where the lights would have come on automatically.
Certainly sounds like an issue with the light sensor which is mounted in the back of the rearview mirror facing the windscreen.
Graham
Certainly sounds like an issue with the light sensor which is mounted in the back of the rearview mirror facing the windscreen.
Graham
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I don't understand this, have a look at page 87 here http://www.captainjaguarscathouse.co...ec%20Guide.pdf
May be different for your car, but you can see that the lights off signal comes from rear view mirror module, regardless of the position of the light stalk. So the only thing that could cause the problem is the mirror, I don't understand why the dealer would change the stalk.
After finding this I realise that I was looking at the rain sensor not the light sensor so will have another tweak tonight and test out the sctual signal from the mirror to the body module.
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RaceDiagnostics (09-05-2012)
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If you need to get at the stalk wiring (which does frequently break) download JTIS from the HOW-TO sticky at the top of this section (if you haven't already) and look at these sections
86.65.92 Steering Column Multifunction Switch in Chassis, where you'll also find Steering Wheel Removal
In Body and Paint, 501-20B you'll find the driver air bag removal details.
Be careful to follow the airbag instructions - they can seriously injure you.
86.65.92 Steering Column Multifunction Switch in Chassis, where you'll also find Steering Wheel Removal
In Body and Paint, 501-20B you'll find the driver air bag removal details.
Be careful to follow the airbag instructions - they can seriously injure you.
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RaceDiagnostics (09-05-2012)
#13
Got back on to this one today.
There are 5 connections to the rear view mirror, Power, Ground, Reverse input, Mirror tint output, Auto Light output.
I removed the mirror and tested it on the bench unfortunately the Auto light output is non functional, so it looks like I will need to find a new/old mirror.
I first unclipped the two plastic covers at the base of the mirror, and disconnected the harness. The mirror came off the window easily by sliding/wiggling it down/parallel to the screen.
Surprisingly there are three differenet light sensors on the mirror, one pointing forwards, and one back, these are both light dependant resistors LDRs. Then there is also a photodiode that points generally upwards in the mirror mounting housing. The system is implemented using a Motorola (now Freescale) MC68HC705JJ7 8 bit microcontroller.
Some pics...
There are 5 connections to the rear view mirror, Power, Ground, Reverse input, Mirror tint output, Auto Light output.
I removed the mirror and tested it on the bench unfortunately the Auto light output is non functional, so it looks like I will need to find a new/old mirror.
I first unclipped the two plastic covers at the base of the mirror, and disconnected the harness. The mirror came off the window easily by sliding/wiggling it down/parallel to the screen.
Surprisingly there are three differenet light sensors on the mirror, one pointing forwards, and one back, these are both light dependant resistors LDRs. Then there is also a photodiode that points generally upwards in the mirror mounting housing. The system is implemented using a Motorola (now Freescale) MC68HC705JJ7 8 bit microcontroller.
Some pics...
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