Fuse number for rear running lights ?
#1
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Fuse number for rear running lights ?
Is there a fuse for the rear (side) running lights on a 2002 XKR ?
Front running lights & everything else works fine including stop lights , taillight’s and tag light.
Tried new bulbs, a no go.
I have the fuse chart in the vehicle care booklet, but don’t see a fuse labeled for the rear running lights. A relay ?
Blindness is a possibility I know.
Z
Ideas ? Neither rear running light will illuminate.
PS if the fuse is #21 in the luggage fuse box, I tried replacing that one without success.
Front running lights & everything else works fine including stop lights , taillight’s and tag light.
Tried new bulbs, a no go.
I have the fuse chart in the vehicle care booklet, but don’t see a fuse labeled for the rear running lights. A relay ?
Blindness is a possibility I know.
Z
Ideas ? Neither rear running light will illuminate.
PS if the fuse is #21 in the luggage fuse box, I tried replacing that one without success.
Last edited by zray; 10-11-2022 at 05:01 PM.
#2
Ref: Fig.09.2 of the 2002/2001 Electrical Handbook. It is indeed Fuse #21 in the trunk fusebox. This fuse is ahead of the Bulb Fail Sensing feature of the Security and Locking Module which, in turn is ahead of both rear side marker bulbs which each side finally goes to Ground.
Just curious, are you getting a "failed bulb" notification of sorts? Here is a link that may help:
https://www.jaguarforums.com/forum/x...06/#post399002
Just curious, are you getting a "failed bulb" notification of sorts? Here is a link that may help:
https://www.jaguarforums.com/forum/x...06/#post399002
#3
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Thank you for the reply.
no notifications on dash. Just no voltage to side lamps in the rear.
great timing, as I have no time to trace wiring for a fault, tomorrow I have to drive about 500 miles for medical evaluation. And the same mileage the following day to get back to my own bed.
I just dislike starting a trip without all bulbs working as they should. After I’m back on home ground I’ll take out the trunk (boot) linings and try to get a handle on the fault. The wires to each bulb do see some heavy duty vibration and exposure to the elements. So once I find where the voltage vanishes, I’m hoping a test jumper wire will get the bulbs to illuminate and
expose where the problem originates.
Z
no notifications on dash. Just no voltage to side lamps in the rear.
great timing, as I have no time to trace wiring for a fault, tomorrow I have to drive about 500 miles for medical evaluation. And the same mileage the following day to get back to my own bed.
I just dislike starting a trip without all bulbs working as they should. After I’m back on home ground I’ll take out the trunk (boot) linings and try to get a handle on the fault. The wires to each bulb do see some heavy duty vibration and exposure to the elements. So once I find where the voltage vanishes, I’m hoping a test jumper wire will get the bulbs to illuminate and
expose where the problem originates.
Z
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zray (10-12-2022)
#5
Z:
I should have picked up in my first post that Splice BTS7 in addition to the rear side markers, also feeds to the license plate lights thru the security and locking module.
(PDF attached)
So even if you are away for home, you may want to see if your plate lights are burning, indicating that the fuse and such ahead of that splice are good to go.
I should have picked up in my first post that Splice BTS7 in addition to the rear side markers, also feeds to the license plate lights thru the security and locking module.
(PDF attached)
So even if you are away for home, you may want to see if your plate lights are burning, indicating that the fuse and such ahead of that splice are good to go.
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michaelh (10-12-2022)
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#8
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Likely a little late for you journey, but if your LHS tail lamps are lit, then it's somewhere downstream of BTS7. BTS40 or SLM connector? Could also be SLM internal resistor, although I'd expect a dash warning in that case. Check if there's any voltage on the side markers with both bulbs removed.
Last edited by michaelh; 10-12-2022 at 07:12 PM.
#9
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Likely a little late for you journey, but if your LHS tail lamps are lit, then it's somewhere downstream of BTS7. BTS40 or SLM connector? Could also be SLM internal resistor, although I'd expect a dash warning in that case. Check if there's any voltage on the side markers with both bulbs removed.
all other lights are good to go. From reading on the forum it seems I might have some intermittent issue with the brake light switch. But so far no codes are thrown and no faults are shown on the dash display.
Z
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#11
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I took a longer way on the outbound portion and ended up with 1,120 miles total on the car (and myself) over a two day period. The car did very well; most of the time I drove at 75-90 mph. The usual no drama from the drivetrain.
yes , with one rear side marker bulb installed the voltage drops to zero when checking the other side.
Z
PS I have to point out that modern automotive electrics are way above my comfort zone of understanding. That’s probably why I’ve been driving classic cars since 1966. I can fix them without getting a splitting headache.
Last edited by zray; 10-14-2022 at 04:03 PM.
#12
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Good to hear.
So there's a high resistance somewhere downstream of BTS7. The side markers have separate ground connections so less likely to be a grounding issue.
I'd measure voltage upstream from BTS40 back through the SLM to BTS7. Unfortunately that means pulling the SLM out of the trunk box to get to its connectors.
So there's a high resistance somewhere downstream of BTS7. The side markers have separate ground connections so less likely to be a grounding issue.
I'd measure voltage upstream from BTS40 back through the SLM to BTS7. Unfortunately that means pulling the SLM out of the trunk box to get to its connectors.
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#15
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#16
I was a little surprised that you have 4 volts with the bulbs removed. (front probing in effect) I was expecting that to be 12 volts. I agree with Mike that you have a high resistance at or downstream of BTS7. Since the reading is 4 volts, I suspect a poor connection whereas there are both series (8 volts inline) and parallel (4volts produced by current leakage to ground) voltage division. Hopefully, getting rid of such a poor connection/connections would result in a full 12 volts across those marker bulbs.
#17
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Z:
I should have picked up in my first post that Splice BTS7 in addition to the rear side markers, also feeds to the license plate lights thru the security and locking module.
(PDF attached)
So even if you are away for home, you may want to see if your plate lights are burning, indicating that the fuse and such ahead of that splice are good to go.
I should have picked up in my first post that Splice BTS7 in addition to the rear side markers, also feeds to the license plate lights thru the security and locking module.
(PDF attached)
So even if you are away for home, you may want to see if your plate lights are burning, indicating that the fuse and such ahead of that splice are good to go.
So I should be looking for a short or break in wiring between the BTS7 and where the power for the side markers diverge to each side ?
Z
#18
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Dr. D, I just printed out the rear light schematic you kindly posted. I’ll pull out the plastic rear trunk liner as soon as I can and start tracing .
I do know that both sides of fuse #21 have power, so I’ll start with module and see if the R/W wire going into it still is active.
Thanks again to all who have posted. Very valuable pointers, that are sure to save me troubleshooting time.
Z
I do know that both sides of fuse #21 have power, so I’ll start with module and see if the R/W wire going into it still is active.
Thanks again to all who have posted. Very valuable pointers, that are sure to save me troubleshooting time.
Z
#19
Since splice BTS7 does feed both the side markers and the license plate lights, it seems odd that the license plate lights are functioning normally.
So I should be looking for a short or break in wiring between the BTS7 and where the power for the side markers diverge to each side ?
Z
So I should be looking for a short or break in wiring between the BTS7 and where the power for the side markers diverge to each side ?
Z
I do think that you are on the right track and I hope that it turns out to be an easy fix. I had a somewhat similar problem that to my embarrassment, took me a couple of weeks to solve.
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