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I have a 2016 cayenne base with the led headlights. Recently the passenger headlight stopped working and I’m at a loss as to where to start. All leds in the lights aren’t working unsure if the main led burnt out and caused the rest to stop working of if I’m sol and searching for a new headlight. All fuses are good unless there’s a hidden one.
Have you had a fault code reader on the car at all? that may give you an idea. I know you said all the fuses are good but it might also be worthwhile pointing out which ones you have checked as someone on here may be able to confirm if there are any others etc.
Have you had a fault code reader on the car at all? that may give you an idea. I know you said all the fuses are good but it might also be worthwhile pointing out which ones you have checked as someone on here may be able to confirm if there are any others etc.
I have not. Any recommendations on which one to get? As for fuses I’ve checked the headlight beam adjustment (xenon) dynamic front lighting control.
also to note there is power to it as the lights do move when you turn the car on just no actual lights working.
Have you seen that other lights work on that side or quarter of the vehicle? Obviously the DRLs aren't working, and presumably the low-beam, but what about high-beam? What about fog lights front and rear? Looking at this thread for the wiring diagram, you can see there are multiple paths involved with the operation of the light unit. The fact that you see it attempting to level indicates some degree of signal to the unit, but possibly not all. You may need to re-seat your harness to the unit, or clean the terminals, replace the harness, etc. if the fog lamps work, otherwise there may be a wiring or module issue to lights for that side or quarter.
Have you seen that other lights work on that side or quarter of the vehicle? Obviously the DRLs aren't working, and presumably the low-beam, but what about high-beam? What about fog lights front and rear? Looking at this thread for the wiring diagram, you can see there are multiple paths involved with the operation of the light unit. The fact that you see it attempting to level indicates some degree of signal to the unit, but possibly not all. You may need to re-seat your harness to the unit, or clean the terminals, replace the harness, etc. if the fog lamps work, otherwise there may be a wiring or module issue to lights for that side or quarter.
All other light in the vehicle are working it’s just that head light. Just had a good rain here and noticed that there’s a fair amount of condensation on the inside of the lens. When I had the light out I didn’t notice any corrosion on any of the terminals or plugs but didn’t want to take the whole headlight apart. Not to sure where the next step is.
Since it seems you have isolated the problem to just that assembly, the next steps are possibly a code read as carlos85 suggested, and probably disconnecting the unit and trying to clean the connectors for both ends of the harness. I don't see that any recommendations have been made for a code reader, but picked up a Launch x431 for myself based off of the Cayenne Coding Ultimate Guide thread. The iCarScan unit is mentioned tons of times throughout the forum as well, and may be a good way forward to simply get diagnostic information if coding isn't a concern. I only have experience with the Launch unit so far, so I can't really give a more-informed recommendation.
The easiest way to take a run at cleaning the connectors would be with some spray cleaner like CRC electronic cleaner or WD-40 specialist electrical contact cleaner and the straw attachment to force the fluid in and any particulates out. You can spray the cleaner on, allow it to dry, then go for a second or third time with the straw to force out any contaminants that were released from the metal surface of the connectors. If you want to be particularly thorough, you can go as far as taking the assembly out entirely and cleaning each pin with acid and neutralizing with a base (salt-impregnated vinegar to clean, brush off contaminants, baking soda-impregnated water to neutralize). Be sure to use the spray on both male and female connector ends from the main harness to the connector to the headlight itself for the best run at clearing the electrical path.
The condensation inside the lens indicates it is not sealed properly, so some oxidation has likely occurred and the cleaning is to attempt to repair that. You may need to make sure the unit is fully dried as well, which could just be taking it inside or keeping the vehicle in a garage for an extended period, or setting up a fan to blow on the removed unit for a while, to even going as far as baking the headlight (not entirely recommended as you 1) wouldn't want that smell in your oven 2) would have to use wood that is NOT pressure treated to sit the lights on so you don't melt them via metal contact with the grates and don't aerosolize the chemical infusion that permeates PT wood, and 3) have to thread the line in temperature and time where you aren't melting the adhesives to the point the unit falls apart. There are videos out there recommending temperatures until 180* for Porsche lights, but those are usually geared towards removal of the lens for various purposes.
If you don't find any codes, and the spray cleaning method doesn't improve the situation, you may be down to disassembly and cleaning/troubleshooting the main harness connectors to the unit, or the unit itself. If a multi-meter shows the expected signal on all posts from the main harness, the focus would be on the headlight unit itself and how involved you want to get with component-level troubleshooting/cleaning or considering replacement.
It's most likely the module located on the bottom of the headlight assembly. When water gets into the headlight housing, gravity sends it straight to that module. Your part number is 7PP941572B.The left and right headlight modules are interchangeable, so you can swap them and if the problem follows the module, you have your confirmation. I'm going through the same issue right now and am looking into getting a PIWIS in order to commission new modules.
It's most likely the module located on the bottom of the headlight assembly. When water gets into the headlight housing, gravity sends it straight to that module. Your part number is 7PP941572B.The left and right headlight modules are interchangeable, so you can swap them and if the problem follows the module, you have your confirmation. I'm going through the same issue right now and am looking into getting a PIWIS in order to commission new modules.
It's most likely the module located on the bottom of the headlight assembly. When water gets into the headlight housing, gravity sends it straight to that module. Your part number is 7PP941572B.The left and right headlight modules are interchangeable, so you can swap them and if the problem follows the module, you have your confirmation. I'm going through the same issue right now and am looking into getting a PIWIS in order to commission new modules.
This is exactly what happened to my 958 S two days ago… oddly enough, both sides!
Took the ballasts off earlier today and both were full of water.
Thinking it’s related to the new headlight seals I bought a few months ago from eBay (so not Porsche brand) and the fact that we’ve recently had a couple of tropical storms recently.
Cleaning and drying everything out now, ordering some new headlight seals from Porsche, and hoping I won’t have to get new ballasts when I get everything back together.
thank bro , but im not shure if it's BCM or the headlight , bceau i had water in the rear of the car from the sun roof , now the headlight same time it works same time not
im sure now because when a use the left headlight balast on the right headlight, thebheadlight works fine
the problem now i bought a new balast from porsche
but it needs reprogramation
please guys any one know how to do that a video or any information cause i can't have any appointment at porsche before 22decembre
please help guys with any information howa to do that
im based in Paris france
06-01-2023, 01:00 AM
958.2 headlight issue
same problem
