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From what I recall, and perhaps this is just North American specific, it's OK if both bulbs are working or non working, the issue is when one of the two are not working - then it's a fail.
I have this issue. The right fog light will not turn on. Checked the bulb. Is fine. I swapped the two and still, the right side will not light up when connected to the right side. It will turn on when connected to the left side. Checked for power at the right fog light plug, there is none but all the other lights work. I am puzzled. Ideas?
I have moved your post to start your own thread since the old thread to which you had posted was titled "need help please," which is about as vague as possible, so members with knowledge about your specific issue wouldn't know to click on the thread.
The right and left front fog lamps both receive power from the same Front Fog Lamp Relay, so it is likely that your right fog lamp has a problem with either its power supply wiring or its ground side wiring. The fog lamp is grounded at the same point as the right side marker lamp, so if the latter works, the ground may be all right, but should be checked.
The ground point is the Right Hand Bulkhead Ground Stud:
Each fog light has it's own fuse, fuse 18 in each underbonnet/engine bay fuse box. Check the RH one, it's probably blown or dirty.
Pretty much all the lights in these cars have their own LH/RH fuses.
Hi Jeff,
I don't know if the Australian or RHD cars are different, but according to the 1996 Electrical Guide in my library, there is only one relay for both front fog lamps and only one fuse. That fuse is #18 (15A) in the Left Hand Engine Bay Fuse Box. Since someguy's left fog lamp works, we would think the fuse should be good.
Fuse #18 in the Right Hand Engine Bay Fuse Box appears to power the right tail lamp.
If you have a different Electrical Guide in pdf format, I would love to have a copy!
On the 1996 wiring diagram, there are no fuses shown between the single front fog lamp relay and each fog lamp - the only fuse is upstream of the relay. Your Tech Guide suggests your U.K. X305 is wired differently.
Now I'm curious - going to check the 1995 guide.
Well, sure enough, the 1995 Electrical Guide shows a different setup, with the fog lamps receiving power separately from the left and right Lighting Control Modules (what were called the Bulb Failure Modules on the XJ40). Both the Federal and Rest of World diagrams are similar:
With Jaguars, there's always something new to learn!
I have moved your post to start your own thread since the old thread to which you had posted was titled "need help please," which is about as vague as possible, so members with knowledge about your specific issue wouldn't know to click on the thread.
The right and left front fog lamps both receive power from the same Front Fog Lamp Relay, so it is likely that your right fog lamp has a problem with either its power supply wiring or its ground side wiring. The fog lamp is grounded at the same point as the right side marker lamp, so if the latter works, the ground may be all right, but should be checked.
The ground point is the Right Hand Bulkhead Ground Stud:
Cheers,
Don
Thank you for doing that
I checked the ground. It is intact. However, there is no power on the other side. Between the relay and the connector for the right fog light, something happens to the power supply and I can not track down what it is...
Each fog light has it's own fuse, fuse 18 in each underbonnet/engine bay fuse box. Check the RH one, it's probably blown or dirty.
Pretty much all the lights in these cars have their own LH/RH fuses.
Cheers,
Jeff
I was hoping it was something this simple! But nope, my car was manufactured sometime after August 1995 so that wiring diagram no longer applies...man I was so excited too :/
Trace that Red w/Orange stripe power wire back to the connector plug behind the bumper cover (BR1). It is subject to much dirt and weather. The wire also comes through PI1 in the RH engine bay and PI59 (don't know where that one is).
I didn't know (never noticed) the independent fog lamp controls from the 2 separate front lighting modules on my car. Didn't know the modules carried over from the XJ40 either, but that makes sense until they had a chance to update to a single lighting module in 1996. Interesting!
Trace that Red w/Orange stripe power wire back to the connector plug behind the bumper cover (BR1). It is subject to much dirt and weather. The wire also comes through PI1 in the RH engine bay and PI59 (don't know where that one is).
I didn't know (never noticed) the independent fog lamp controls from the 2 separate front lighting modules on my car. Didn't know the modules carried over from the XJ40 either, but that makes sense until they had a chance to update to a single lighting module in 1996. Interesting!
I got as far as the bumper cover connector. I didn't have power to that red/orange wire either. Beyond that, I could not trace bc I could not find the next connector...
What's even more interesting is that you should look at the fuses and relays in your owner's manual rather than in the wiring diagrams. I have noticed minor differences in that regard too. For example, fuse #2 in my owner's manual is a 5 amp fuse for "luggage compartment lights" as per the owner's manual but from the technical guides and wiring diagrams, depending on the year, it could be for tail lights or power fold mirrors and with different fuse ratings as well (It actually is for the luggage compartment lights, I verified it).
I went down a rabbit hole after seeing watto700's post about his car having different wiring...
These connectors are known to develop bad connections too. Lots of engine functions pass through these.
PI59 is the equivalent connector on the left side. The power supply to the right fog lamp apparently connects through it in order to reach the relay behind the left headlamps. Who knew?
These connectors are known to develop bad connections too. Lots of engine functions pass through these.
PI59 is the equivalent connector on the left side. The power supply to the right fog lamp apparently connects through it in order to reach the relay behind the left headlamps. Who knew?
Rabbit holes tend to teach us a lot....
Thank you sir!
This was the vital clue. I checked the PI59 connector on the LH side, just forward of the fuse box. It seemed like it was plugged it but in reality it was actually loose…and it was very hard to plug it back in (Which I suspect is why some ghost before me hadn’t plugged it back in). I cleaned the contacts and pushed it in with pliers and bam! There was light!
Now I know for my own sake too if I have a problem, the US 95 being different than the 96.
It is interesting (to me) to decipher the wiring diagrams and then hunt down the corresponding wires and plugs on the vehicle. Most of the time you find out they really do match.
On the 1996 wiring diagram, there are no fuses shown between the single front fog lamp relay and each fog lamp - the only fuse is upstream of the relay. Your Tech Guide suggests your U.K. X305 is wired differently.
Now I'm curious - going to check the 1995 guide.
Well, sure enough, the 1995 Electrical Guide shows a different setup, with the fog lamps receiving power separately from the left and right Lighting Control Modules (what were called the Bulb Failure Modules on the XJ40). Both the Federal and Rest of World diagrams are similar:
With Jaguars, there's always something new to learn!
Cheers,
Don
I could only assume this is due to the difference between combined light module in later cars and seperate ones in early cars.
i will check my fuses as my car is a feb '95 build but does have the combined light control module.
so far i have just used the '96 wiring diagrams as reference and not seen any thing different yet in my car compared to those diagrams.
Now I know for my own sake too if I have a problem, the US 95 being different than the 96.
It is interesting (to me) to decipher the wiring diagrams and then hunt down the corresponding wires and plugs on the vehicle. Most of the time you find out they really do match.
i keep meaning to reference the wiring diagrams and compare it to my car to find out what all the various connectors under the bonnet and in the boot that are not connected to anything are intended for.
i really love wiring diagrams. something bout the logic flow of them,.
kinda why i like coding on computers too.
you could say i am a NERD
We get to be the coolest NERDS of all with our Jaguar cars. We are the "bad boys" of the nerds category.
I've spent countless hours searching wiring diagrams, learning things and looking into the car for corresponding parts. Not always out of necessity either! To me it is astonishing that they can translate such tidy schematics into the colorful but bewildering spaghetti wiring inside the car.
Finding out about unused connectors is a neat game too!
Last edited by SleekJag12; Aug 31, 2022 at 02:52 AM.
Reason: Added comment
Right Front Fog Lamp Inoperative
