Hi All
lights under hood won’t turn on. Bulbs are ok, no power to light.
When do they turn on? Tilt? I’m amazed at the knowledge some of you
have. Anyway, any suggestions?
Boxcar--
boxcar
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They only turn on if the headlights are on.----- Original Message -----
From: “boxcar” bobbydunn@comcast.net
To: xj40@jag-lovers.org
Sent: Monday, October 15, 2007 10:50 PM
Subject: [xj40] 93 XJ40 ONDER HOOD LIGHTS
Hi All
lights under hood won’t turn on. Bulbs are ok, no power to light.
When do they turn on? Tilt? I’m amazed at the knowledge some of you
have. Anyway, any suggestions?Boxcar–
boxcar
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In reply to a message from boxcar sent Tue 16 Oct 2007:
thanks,there isn’t a switch somewhere? Do lights burn all the time
the headlights are on?–
The original message included these comments:
have. Anyway, any suggestions?
–
boxcar
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In reply to a message from boxcar sent Tue 16 Oct 2007:
Mine don’t work, never have but I’m not bothered.
Consequently, I can only guess that no, they’re not on all
teh time that the headlights are on and I suspect that
they’re switched by the bonnet switch which should be
immediately in front of the r/h BFM.–
JagFab, 1988 JaguarSport XJR 3.6 (RHD)
London, United Kingdom
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In reply to a message from JagFab sent Tue 16 Oct 2007:
actually the switch for the underhood lights is in front of the
left side BFM, not right side…it is a simple plunger type switch
that is activated when the hood is raised and the plunger is
extended…my lights will work when the hood is raised and the
parking lights are on…there is no separate switch to manually
trun the lights on/off…–
Cliff - '93 XJ40 Sovereign (4.0L)
Lancaster/South Carolina, United States
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In reply to a message from JagFab sent Tue 16 Oct 2007:
actually the switch for the underhood lights is in front of the
left hand BFM, not right hand…it is a simple plunger type switch
that is activated when the hood is raised and the plunger
extends…the parking lights must be on before the underhood lights
will work…there is not a separate switch to manually turn the
lights on/off…–
The original message included these comments:
Consequently, I can only guess that no, they’re not on all
teh time that the headlights are on and I suspect that
immediately in front of the r/h BFM.
–
Cliff - '93 XJ40 Sovereign (4.0L)
Lancaster/South Carolina, United States
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In reply to a message from Cliff Archie sent Tue 16 Oct 2007:
actually the switch for the underhood lights is in front of
the left hand BFM, not right hand.
Crikey! I’d better move mine back to its proper position,
then… :)–
JagFab, 1988 JaguarSport XJR 3.6 (RHD)
London, United Kingdom
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In reply to a message from JagFab sent Tue 16 Oct 2007:
i guess it is a case of the RH and LH drive thing we run into for
various countries…–
The original message included these comments:
Crikey! I’d better move mine back to its proper position,
then…
–
Cliff - '93 XJ40 Sovereign (4.0L)
Lancaster/South Carolina, United States
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Cliff,
I think it may really be due to a design change between the years as my
"88MY also has the plunger on the right side (passenger side) right on the
radiator bracket housing.
Butch Schneider
Wisconsin, USA
88 xj40 (Mr Spock)
72 Triumph TR6R (Baby)
97 Dodge Ram 2500 (Arnold)
94 Jeep Cherokee (Jasmine)----- Original Message -----
From: “Cliff Archie” rcarchie@nationalgypsum.com
To: xj40@jag-lovers.org
Sent: Tuesday, October 16, 2007 2:00 PM
Subject: Re: [xj40] 93 XJ40 ONDER HOOD LIGHTS
In reply to a message from JagFab sent Tue 16 Oct 2007:
i guess it is a case of the RH and LH drive thing we run into for
various countries…The original message included these comments:
Crikey! I’d better move mine back to its proper position,
then…–
Cliff - '93 XJ40 Sovereign (4.0L)
Lancaster/South Carolina, United States
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services and resources including Photo Albums, Event Diary / Calendar, On
Line Books and more !
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In reply to a message from Butch Schneider sent Tue 16 Oct 2007:
Butch,
Spot on.
Up to and including 1992 MY, the hood light switch was on
the right front of the engine bay but in '93 they switched
it to the left side above the headlight. It had no LHD / RHD
implications.–
The original message included these comments:
I think it may really be due to a design change between the years as my''88MY also has the plunger on the right side (passenger side) right on the
radiator bracket housing.
–
Bryan N, '91 Sovereign 4.0 L, RHD
Cambridge, United Kingdom
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In reply to a message from Bryan N sent Tue 16 Oct 2007:
It’s all clear now. There might be a switch up front on one side or
the other or the middle.Just kidding thanks all–
boxcar
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In reply to a message from Bryan N sent Tue 16 Oct 2007:
in '93 they switched it to the left side above the
headlight
…most likely because it saved them a few pence per car on
wiring. It must have made sense to an accountant. Never mind
that he/she overlooked the cost of re-designing the loom;
re-tooling to produce the loom; training the line operators
where to put it; updating parts catalogues; updating service
manuals…
I’m being simplistic, I know, but come on: with the beneift
of hindsight, does this kind of thing make sense to ANYONE?–
JagFab, 1988 JaguarSport XJR 3.6 (RHD)
London, United Kingdom
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In reply to a message from JagFab sent Wed 17 Oct 2007:
Ian,
Jaguar probably had very good reasons for what appears to be
a simple re-positioning of that hood light switch to the
left side on the '93 models. For example, they introduced a
twin electric fan ‘cooling pack’ which required a new
radiator top panel and a completely revised wiring harness
design. It therefore made sense to incorporate the hood
switch wiring in the LS (left side) harness along with all
the electrics from the cooling fans and their control relay
module control which is located in the left front wing void.
It was an engineering decision - not that of the bean
counters this time! :-)–
The original message included these comments:
…most likely because it saved them a few pence per car on
wiring. It must have made sense to an accountant. Never mind
that he/she overlooked the cost of re-designing the loom;
I’m being simplistic, I know, but come on: with the beneift
of hindsight, does this kind of thing make sense to ANYONE?
–
Bryan N, '91 Sovereign 4.0 L, RHD
Cambridge, United Kingdom
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I just fixed my under hood lights. The fix was very simple. Took the rubber boot off from the hood switch/alarm, it just pulls off. The boot was preventing the switch from contact when hood was open. Used an ohm meter and when hood was closed, hi ohms, when hood was open low ohms after removing the boot. Cut off the piece of the boot that contacts the plunger and still have some water ingress protection after reinstalling. VERY EASY FIX.
I noticed from the time I first got my jag home that the under hood lights didn’t come on when opening the hood. I vowed to one day look into it but it wasn’t high on my to-do list, and to be honest, I never really thought about it again. Seeing the recent post in here prompted me to read the whole thread. A couple folks noted the headlight switch needing to be in the parking lights position for the under hood lights to come on. I just went out and tried it and sure enough they both lit! And the plunger switch works to turn them off upon closure. One less thing to look into… Thanks!
In my 89 the bonnet light switch as I recall is on passenger side near bonnet hinge… only get power if headlights are on… check the connections at the switch with voltmeter with headlights ON and see if there is power at the SPST single pole single throw simple ON OFF switch… yes a nice feature at night that most cars do not have… if you find power on one side of the switch… great!! then press switch ON and see if power gets to other side of the switch… if not may indicate a corroded or dirty switch… could be cleaned and or replaced… if switch is working then the hood bulb sockets may be corroded or wire chafed or broke but at least you will know if there is any power there and where the problem may by… and if you have no power on the hood switch trace the wire back as it got broken somewhere
I checked why my hood lights did not come on… checked with park light switch off and on, .at both bulb sockets both sides of the socket was 12v when going to a ground, no volts between socket points. Found that the hood plunger was not making good contact when hood open because the rubber boot around the switch was preventing full movement. removed some of the rubber boot with exacto knife and hood switch worked, lights come on, but remember the park lights must be on.
