ucsherriff

Well I bought my 2004 Porsche Cayenne S recently and I noticed after I started playing with the light **** that the fog lights, my right headlight, and right side marker does not work. The entire headlight does not work at all. Does anybody have any suggestions as to what it might be? I'm a novice to my Cayenne and if anybody could help it would be most appreciated!

XR4Tim

Check the fuse. It's in the right end of the dashboard. The owner's manual has a typo, where it lists the fuses for both fuse boxes, and labels them both as "left side of dash". The second list of fuses is actually for the right side of the dashboard.

ucsherriff

I did see that some of the fuses are different voltages to what they should really be in the manual. Maybe I should just rearrange what I can since they are all tested to be correctly working and buy the certain voltages that I need. Thanks for the tip. Are there any precautions to take as to how to work on these fuses?

XR4Tim

Just don't do it with the car on.

Andy E.

I'd put money on a loose or bad ground point at the right-side engine compartment; more so if the car was accidented at that corner and body work was performed.

Autobody techs have a bad habit of not putting electrical components back in the way they were found....

ucsherriff

Andy E. you sure know your stuff. There was work done on that side because it was damaged there. I bought it at an auction from Iowa. Had to replace suspension parts (control arm, tie rod, etc..) and other body parts. It was a hassle. So you say it's a bad ground or loose ground? Could you give me some DIY tips or directions on how to do it? I have some minimal car experience but that's about it, especially with this princess. I'm going to check the fuses first just in case.

Andy E.

In all electrical issues, the fuse is always first on the "To Check" list.

Here are the ground points for the 2004 Cayenne. If you're unsure of your technical limits in approaching this type of work, have a technician look it over for you.

ucsherriff

Okay so I checked engine compartment and the left side fuses. The right I couldn't check because a wall was blocking the door from opening all the way. I don't feel like moving the car since it's late now. Most of them are there some are missing where there's supposed to be some and few are not in the same way as all the others. But my Cayenne seems to run fine except for just the lights... should I get the others anyway?

gracey

My Porsche Cayenne S 04 , has had a leak resulting in a lot of water inside ( Door seal was crimped on rear tail gate door ) , spare tyre area full of water , electrics wet , all the sponge bits wet , dried everything out but now have electrical problem , warning lights for suspension , PSM unit etc , car will start on ignition but wo'nt allow me to put it into gear ( auto box ) , have to buypass gear change , by removing centre console unit and then it starts using emergency start sytem . Will then resart intermittantly on key & allows gear change , but then go back in an hour & its back to no gear change allowed & flashing lights etc .
Are the electrics all damaged or does something need to be reset ???? Any suggestions please ?
Rang Porsche but were useless !

bshirer

Can anyone shed some insight on the actual locations of the MB2 and MB6 grounding points, specifically how to access them? The 2D pic doesn't show if the points are high in the engine bay, or lower on the frame. I've pulled out the front passenger headlamp, and I am wondering if the MB2 grounding point is below the plastic bracket, because I can't get a visual on it.

I'm having a similar problem with my right side blinker not working sporadically. I switched bulbs with the left side, and the problem remained only on the right side - so its not a bulb issue. I also just started with similar 'check high beams' warning, and they appear fine, so t looks like the grounding points might be responsible for these random warning.

XR4Tim

Bulb holders are a frequent cause of turn signal failure. Try switching the bulb holder from the left to the right side.

bshirer

I did try that for the turn signals, which are my only failure point. It is still only the right hand side that is failing, and only at certain times.

The pattern is that I start the car and drive it, and they work fine for a time or two (and I can see them working in the reflection of the car in front of me) - then the next time I get the warning, the blinker rhythm increases on my dashboard indicator (the rears still work, just faster), and then it will not work again until I restart the car.

I am having problems locating the ground points in the diagram, so I am going to now try to tap into the blinker ground wire and ground it manually to the ground post in the engine bay - just to help debug the issue.

Travis

Check the bulb contacts on the headlight housing. I dislodged one of the contact points on the orange bulb(turn signal) and caused the bulb to not get power. Carefully look for the contact spring to be fully seated in the slot.

Hope that helps.

bshirer

My test worked. On my lights, pin 2 is for Turn Signal lead (+) and pin 10 is Corner/parking/Turn Signal Ground (-). I tapped into the wire on pin 10 and grounded it manually/temporarily and the problem ceased. It is definitely a grounding issue with the existing wires/harnesses - where the wire is not securely grounded. I need to find the grounding point and clean it all up and tighten it down for a more permanent solution. I just wanted to verify that it was a grounding issue before I moved on.

Schmides

Stupid question but what do you mean by pin 2 and pin 10? I'm having similar issues where my driver side turn signal keeps going out in conjunction with my side marker. And my cornering lights on both sides don't work.

Thanks