1989 XJS Brake Lights Not Working
#1
1989 XJS Brake Lights Not Working
I have a 1989 XJS here in the UK and none of the brake lights are working. I do not have a third top brake light on my car.
I have checked the 10amp fuse under the dash, which is fine, but have not been able to locate a relay for the brake lights. I am assuming it is a bad brake pedal switch, but I wanted to locate the relay first before purchasing a new switch. Any guidance on where I should look? I tried searching this forum, but did not find a definitive answer. Thanks in advance.
P.S. I don't know how this could be related, but lately, whenever I press the brake pedal for the first few times, it sounds like a pump starts working on the passenger side. It comes on for a few seconds, kinda groaning, and then stops. Is this normal, or a sign that I need a new abs pump?
I have checked the 10amp fuse under the dash, which is fine, but have not been able to locate a relay for the brake lights. I am assuming it is a bad brake pedal switch, but I wanted to locate the relay first before purchasing a new switch. Any guidance on where I should look? I tried searching this forum, but did not find a definitive answer. Thanks in advance.
P.S. I don't know how this could be related, but lately, whenever I press the brake pedal for the first few times, it sounds like a pump starts working on the passenger side. It comes on for a few seconds, kinda groaning, and then stops. Is this normal, or a sign that I need a new abs pump?
#2
Do you have voltage on both sides of the brake light switch when the pedal is depressed??
You'll have to wait on someone with more ABS knowledge but from some pictures I have seen, the accumulator and pump are on the opposite side of the master cylinder on some cars. It should not be making a noticeable noise so I would check the brake fluid level and condition and verify the accumulator is okay. Press the pedal after the car is shut off, you should have about 2 full power assisted braking operations and then it will get more difficult.
You'll have to wait on someone with more ABS knowledge but from some pictures I have seen, the accumulator and pump are on the opposite side of the master cylinder on some cars. It should not be making a noticeable noise so I would check the brake fluid level and condition and verify the accumulator is okay. Press the pedal after the car is shut off, you should have about 2 full power assisted braking operations and then it will get more difficult.
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hamiltonian (03-03-2014)
#3
#4
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hamiltonian (03-03-2014)
#5
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hamiltonian (03-03-2014)
#6
For the brake light circuit the ignition must be in the first position, at least, if not ignition on. For an example of a test light see:
HEAVY DUTY 6-12V AUTOMOTIVE ELECTRICAL CIRCUIT TESTER | eBay
or
There are also meters for this purpose, but they are a bit more complicated to use.
Basically, current comes out of the battery via the positive terminal though insulated wires to the device that needs power. After the device, the current is returned (ie the circuit completed back to the battery) merely by feeding it to a convenient earthing place near the device concerned. The current then makes its way through the metal of the body back to the battery via the large earthing bolt terminal in the boot that the large negative battery terminal it is connected to. In testing a circuit, you are trying to ascertain why this circuit is not functioning (ie where the break in the circuit is). So it could be the fuse, it could be the switch on the pedal, it could be a fractured wire somewhere, etc etc. The tester by helping you find out where the current in the circuit is reaching to, helps to find the break and thus the cause of the trouble.
Greg
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hamiltonian (03-03-2014)
#7
P.S. I don't know how this could be related, but lately, whenever I press the brake pedal for the first few times, it sounds like a pump starts working on the passenger side. It comes on for a few seconds, kinda groaning, and then stops. Is this normal, or a sign that I need a new abs pump?
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#8
#9
Just an update. The brake lights are now working. It turned out to be a faulty brakelight switch. Replaced, after much struggling in the confined space under the dash, with PART NO. DBC2960. (valid up to VIN 179736): Part no. DBC2960 | Brake pedal microswitch parts from Jaguar Classic Parts UK
One question: The part that I got had an extra connector for the speed control system (that black cylinder connector in the diagram). I don't have anything to connect that to, so I just left it dangling.
Did all 1989 3.6 models in the UK have speed control? I have a speed control button on the center console, but do not have a speed control switch on the turn signal stalk.
Thanks again for the help!
One question: The part that I got had an extra connector for the speed control system (that black cylinder connector in the diagram). I don't have anything to connect that to, so I just left it dangling.
Did all 1989 3.6 models in the UK have speed control? I have a speed control button on the center console, but do not have a speed control switch on the turn signal stalk.
Thanks again for the help!
#10
I am confused, and perhaps second guessing myself because you have a RHD 3.6...
What I want to say is that no XJS really had options. If by speed control you mean cruise control, they all have it and the controls are on the center console, there is no stalk control for it.
all the stalks do is control high beams, turn signals, wipers and washers
What I want to say is that no XJS really had options. If by speed control you mean cruise control, they all have it and the controls are on the center console, there is no stalk control for it.
all the stalks do is control high beams, turn signals, wipers and washers
#11
#12
It is possible that on Hamiltonian's car the blanking piece on the right hand side of the skislope that went in the hole where the CC switch would go if there was such fitted, was lost and a previous owner put a CC switch in there just to fill the hole. IF his car HAS got CC, then carefully prising out this switch and seeing if there are any wires attached should determine the matter.
As for getting it to work, that would be another matter!
Greg
Last edited by Greg in France; 03-06-2014 at 01:28 AM.
#13
Thanks for the information. I have a feeling some significant work had been done on the controls and dash area at some point, so the stalk control with "resume" could have been replaced at some point. I won't bother to check this out until I need to take the ski-jump area apart (a future project to fix a bad ground from the stereo, which is getting buzzing interference from the alternator).
There was not a lot of history with my car, other than the previous owner purchased it in 2007 for 500 pounds, and set to work restoring it to a decent level -- although, as I'm finding out, he left some major work undone (mostly with the suspension).
There was not a lot of history with my car, other than the previous owner purchased it in 2007 for 500 pounds, and set to work restoring it to a decent level -- although, as I'm finding out, he left some major work undone (mostly with the suspension).
Last edited by hamiltonian; 03-06-2014 at 02:15 AM.
#14
Thanks for the information. I have a feeling some significant work had been done on the controls and dash area at some point, so the stalk control with "resume" could have been replaced at some point. I won't bother to check this out until I need to take the ski-jump area apart (a future project to fix a bad ground from the stereo, which is getting buzzing interference from the alternator).
There was not a lot of history with my car, other than the previous owner purchased it in 2007 for 500 pounds, and set to work restoring it to a decent level -- although, as I'm finding out, he left some major work undone (mostly with the suspension).
There was not a lot of history with my car, other than the previous owner purchased it in 2007 for 500 pounds, and set to work restoring it to a decent level -- although, as I'm finding out, he left some major work undone (mostly with the suspension).
The switch on the center console changed around a little from year to year and I believe the column stalks are compatible across the XJ platoform as well, so it is very possible the turn indicator switch didn't work and he picked up the incorrect spare somewhere. Which obviously still fit just fine
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