[x300] No brake lights/reverse lights, car will come out of Park

X300
1

Yes, you read correctly. Just tonight everything worked
fine. I went to change out some bulbs that I had come in
for the 3rd brake light. I went to test them…when I hit
the brakes, the rear fogs went off and the brake lights
didn’t work. The tail lights themselves work, but I noticed
the reverse lights do not work. I checked all the fuses and
all were fine. I even switched a few around from known good
sources and same result. I can only assume it’s not the
brake switch since the car starts and comes out of Park with
no issues. that’s when I noticed the reverse lights not
coming on.

This is in a 96’ Vanden Plas with X308 tails. I have had
ZERO problems with them until now. What could trigger or
blow from the 3rd brake light to cause this? I keep
thinking it’s got to be related to that since before then
all was fine. I switched back to some old but working bulbs
(tested them on another car to be sure) and same result.

What am I not thinking of?? Anyone? Bueller???–
Vanden Plas VIP
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

2

In reply to a message from VIP Emporium sent Thu 17 Apr 2008:

OK, even though no one has replied I will update what I’ve
found myself…here goes:

  1. I do hear the relay by the shifter click when the brake
    pedal is pushed…in fact, it’s quite louder than I remember.
    Also, the car does come out of park like I already mentioned.

  2. I printed out the schematic for the tail lights/stop
    lights/reverse lights/ rear fogs. Which also includes the
    lamp control module.

  3. I checked the diode in line with the high mount brake
    light, but am not sure if it’s operational or not. I also
    switched out the fuel pump relay with the relay for the high
    mount since they are the same type and I know the fuel pump
    relay works.

  4. When I turn on the turn signals or hazards they work and
    clicking is heard from the lamp control module (aka: BULB
    FAIL MODULE). I took it apart to check the circuit board
    for burns or bad solders, but nothing. Although when i
    follow the schematic this seems to be the link between
    things working or not. But buying a $200 part and not being
    sure if it’s the problem or not is not cool in my book. I
    don’t know anyone local to me with the same model car to
    test out their working module.

So once again…what could I be checking that I’m not??–
The original message included these comments:

fine. I went to change out some bulbs that I had come in
for the 3rd brake light. I went to test them…when I hit
the brakes, the rear fogs went off and the brake lights
didn’t work. The tail lights themselves work, but I noticed
ZERO problems with them until now. What could trigger or
blow from the 3rd brake light to cause this? I keep
thinking it’s got to be related to that since before then
all was fine. I switched back to some old but working bulbs
(tested them on another car to be sure) and same result.
What am I not thinking of?? Anyone? Bueller???

–
Vanden Plas VIP
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php –

3

In reply to a message from VIP Emporium sent Mon 21 Apr 2008:

Haha…yet again replying to myself. After some random
searching I found this:

‘‘The stop, reversing and rear fog lamps are controlled by the
security and locking module (SLM), which receives inputs via the
SCP network from the BPM’’

Interesting…is this in the X300 and the X308? Or X308 only??–
Vanden Plas VIP
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php –

4

In reply to a message from VIP Emporium sent Mon 21 Apr 2008:

Well, call off the search…haha. Thanks to the forums, even
though no one came to my rescue…well not directly anyhow.

I’d like to thank member ‘‘JEGUAR’’ for this post he made back
in September of 2005:

''A few days ago, I noticed that the reverse lamps were not
working on my car. The tail lights, turn indicators and
licence plate lamps were working just fine, and the ‘‘bulb
failure’’ light did NOT go on.

Back home, I quickly found that the stop lights and the fog
lights were not working either. I must have been lucky to
not be rear-ended!

All bulbs were good. It took several hours of signal
tracking and testing to finally isolate the problem: there
was no power coming on pin 17 of the ‘‘rear lighting control
module’’.

The fuse #14 in the right hand heelboard fuse box was
burned. This fuse controls power distribution to a bunch of
things (ancillaries, etc.)

I can’t explain why some lights controled by the same module
were working and others not, nor why the ‘‘bulb failure’’
warning didn’t go on (the stop and reverse lights are in the
same circuit in the module, but not the fog lights…)

I hope that this post can save time to someone later.

Best,–
Jean-Eric G. ‘89 XJ40 3.6 l VDP (US), ‘95 X300 3.2 l (Fr)’’

And yes…it has saved me time…and money! Although I have
a Vanden Plas LWB car so that particular fuse box is under
the back passenger (LHD) seat, but the fuse number was the
same. I hadn’t had though of checking it since it listed to
have nothing to do with the lighting. How odd. I am SO
relieved!! Thanks JagLovers!!! So happy I could
donate…it’s now bitter sweet!

The original message included these comments:

In reply to a message from VIP Emporium sent Mon 21 Apr 2008:
Haha…yet again replying to myself. After some random
searching I found this:
‘‘The stop, reversing and rear fog lamps are controlled by the
security and locking module (SLM), which receives inputs via the
SCP network from the BPM’’
Interesting…is this in the X300 and the X308? Or X308 only??

Vanden Plas VIP
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

–
Vanden Plas VIP
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php –

5

In reply to a message from VIP Emporium sent Mon 21 Apr 2008:

Just so there’s no confusion…LHD means Left Hand drive not
left hand side. The rear passenger side seat would be on
the right side if you were sitting in the car. Just didn’t
want that to screw anyone up…and the fuse is a 10amp.–
The original message included these comments:

And yes…it has saved me time…and money! Although I have
a Vanden Plas LWB car so that particular fuse box is under
the back passenger (LHD) seat, but the fuse number was the
same. I hadn’t had though of checking it since it listed to
have nothing to do with the lighting. How odd. I am SO
relieved!! Thanks JagLovers!!! So happy I could
donate…it’s now bitter sweet!

–
Vanden Plas VIP
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php –

6

Thanks for the updates, VIP.

“Mark 1” Mark Stephenson Phoenix, AZ, USA
'52 XK120 S673129, '59 Mk1, '84,'85,'86 &'95 XJ6-----Original Message-----
From: owner-x300@jag-lovers.org [mailto:owner-x300@jag-lovers.org] On Behalf
Of VIP Emporium
Sent: Sunday, April 20, 2008 11:55 PM
To: x300@jag-lovers.org
Subject: Re: [x300] No brake lights/reverse lights, car will come out of
Park…

In reply to a message from VIP Emporium sent Mon 21 Apr 2008:

Just so there’s no confusion…LHD means Left Hand drive not
left hand side. The rear passenger side seat would be on
the right side if you were sitting in the car. Just didn’t
want that to screw anyone up…and the fuse is a 10amp.

7

In reply to a message from Mark Stephenson sent Mon 21 Apr 2008:

So the problem was a blown fuse?

Isn’t there a fuse fail indicator on the dash of these
‘modern’ Jaguars?–
The original message included these comments:

Thanks for the updates, VIP.
-----Original Message-----
want that to screw anyone up…and the fuse is a 10amp.

–
Bryan N, '91 Sovereign 4.0 L, RHD
Cambridgeshire, United Kingdom
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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8

In reply to a message from Bryan N sent Mon 21 Apr 2008:

I wish it was that simple. But yes, it all was just that
one fuse. The most difficult part was that it was labeled
as nothing to do with the lighting system. As I looked over
the schematics I realized that there was much more systems
involved or intertwined with the lights. That’s what led me
to find the other post from years ago.

Upgraded my brakes yesterday to cross drilled/slotted rotors
and performance pads…painted the calipers as well. I
hadn’t know that my car and the XJR shared the same
brakes…just on mine it’s called the heavy-duty brake
system. Interesting…haha.–
The original message included these comments:

In reply to a message from Mark Stephenson sent Mon 21 Apr 2008:
So the problem was a blown fuse?
Isn’t there a fuse fail indicator on the dash of these
‘modern’ Jaguars?

Thanks for the updates, VIP.
want that to screw anyone up…and the fuse is a 10amp.
–
Bryan N, '91 Sovereign 4.0 L, RHD
Cambridgeshire, United Kingdom

–
Vanden Plas VIP
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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9

I’ve joined Jag-Lovers just so I can say how pleased I am to have found this old thread. It has saved me countless hours of testing. I too changed my 3rd brake light to T10 LED’s on my 95 X300 4L and promptly lost all brake lights/ reverse lights etc. Again it was the 10w fuse at 14 in the right interior fuse box. Thank you one and all. Reggie

10

Haha, damn…it’s still helping people! It’s not always easy being one of the first,but if you are, do it right and leave some bread crumbs :call_me_hand:t5:

I’m @elpres_ on Insta in case you wanted to see what I was up to now! Cheers Reg!! :beers: