I have no rear tail lights. Only seem to have the 3rd brake light. I have drl when i turn the car on but when i go to switch the left side control to turn the rear tail lights on and the front turn signals it doesnt work. I have recently replaced the hazard switch, the whole multifunction switch part, brake light switch near the brake pedal. Even cleaned the two rear grounds on the right side of the rear bumper and on the left rear side behind the tire. I even unplugged the plug on the passenger side to see if that would help and still nothing. Ive checked fuses they are all good, i have not replaced any bulbs but might try that next Any help would be great. It seems ive replaced everything and i still have the issue.

 

Is the turn signal on the instrument cluster flashing when you do the turn signal? If not, I would suspect the problem to be with your hazard switch, multifunction switch, the wiring between the two, or a fuse. The DRL function is completely independent of those two components, so just because the DRLs are working doesn't mean the problem isn't with hazard or MFS.

The brake light function for the outside lights pass through the hazard switch and through the MFS. Brakes and turns not working point to these components and anything related to them.

 

Yes it flashes when i go to change lanes. It didnt before but i changed out the hazard switch and now the turn signals function.

 

So the dash light flashes, but your front and rear turn signals don't flash? In that case, there is something wrong with the harness somewhere, as the dash turn signal is downstream from the MFS.

 

Turn signals work. Its my tail lights that are not working for some reason.

 

Make sure the white wire from brake to hazard switch hasn't been disconnected in any way.

 

Thankyou I will check it

 

Moved to C5 Tech.

 

Just to clarify: are you saying when you turn on the parking lights, none of the rear parking lights work?

Do the front parking lights work?

So when you brake, only the 3rd brake light work?

 

When I start the vehicle and i disengage the parking brake the front day time running lights turn on. but when i go to turn the left side switch to turn the front DRL and tail lights on there's nothing. and when i switch it to headlights they come up and turn on but still no turn running lights come on and the tail lights do not come on. and yes only 3rd brake light when i press the brake pedal.

 

I was actually messing with it last night and noticed when i used the turn signals the opposite turn flickered each time the turn signal would light up. idk how to explain it. I will have to take a video of the car. Is there a way to rig it up for now? run a power wire from the fuse box to the tail lights and just splice into it? I actually have been having this problem for a while and recently got stopped and cited for using my hazards on the way home from work. If its not fixed i gotta cough up $200 but if its fixed i only have to pay $10 and let the police department check over to make sure the tail lights work.

 

The C5 electrical lighting system is not straightforward. Don't tell us what you think is happening, tell us exactly what is happening.

So to try and clarify, because you are giving us mixed messages, you have no front or rear turn signals, but DRLs are working. The instrument cluster turn signals are working. You also have no parking lights at all. Do the instrument panels, radio, etc. light up when parking lights are switched on?

Am I correct with this summary? If so, there is something seriously messed up with your electrical system, as there is no one thing that can cause all of those symptoms.

 

well come to find out I do have stop lights when I press on the brake pedal. all 4 light up as well as the 3rd brake light. but still no tail lights that light up when I use the multifunction switch. I'm trying to upload a video now.

 

 

Interior lights turn on with parking light switch, but no exterior lights come on. That is definitely a wiring issue somewhere, most likely inside the car. Coming off of the MFS, it is the brown wire. You can try to check the voltages at various points on the brown wire to make sure there is no disconnect. I have attached a diagram of the exterior light circuit.

The exterior light circuit also shows how the turn signal and hazard switch are wired. If the front turn signal is working and brake lights are working, then it rules out a disconnect in the harness, unless someone modified the rear wiring such that the brake lights are all powered by 3rd brake light, as in the Euro mod. Other than a Euro-modded taillight harness, the only thing that can cause what you're seeing is a defective MFS.

 

It was definitely a good idea to post a video because you've been killing us with bad info

When you move the MFS from OFF to its intermediate position it doesn't turn ON the DRLs. It turns ON the Parking Lights.

Just to clarify: when the DRLs are ON, tail lights should be OFF.

The front OEM bulbs used for DRLs have two filaments:

• One for the DRL/Turn Signal
• One for the Parking Light

When the Parking Lights or the Headlights are switched on, the DRLs go off and the Parking Lights go on. So what happens is that the bulb remains lit, but using a different filament.

Similarly, the OEM bulbs used in the 4 tail lights have two filaments as well:

• One for the Brake/Turn Signal/Hazard
• One for the Parking Light

It's important to know what is what, otherwise troubleshooting becomes impossible

Again, when the headlights are turned ON they are being added to the Parking Lights and NOT to the "running lights" or DRLs.

It's important to double-check things when troubleshooting

The front AND rear Parking Lights are missing. It was a good idea to upload the video.

So to summarize, according to your previous posts:

• Turn Signals are fine
• Brake Lights are fine

It was not shown in the video and you have not explicitly mentioned it, but since you have not said otherwise:

• Hazard Lights are fine (please confirm)

Problem seems to be:

• No Parking Lights all around

You are going to need a multimeter to be able to troubleshoot this problem. Please, don't proceed with the idea you mentioned in your video of "rigging" the system to "force" the lights. It will just compound the problem.

It seems you have an open circuit affecting your Parking Lights. Since it is affecting both, front and rear, and they are split in the underhood fuse box, the problem should not be downstream the underhood fuse box.

As mentioned by Tsumi, the 1st step would be to establish, with the help of a multimeter, if the MFS is providing the single Parking Light output as it supposed to do and take it from there.

 

With the symptoms shown in the video, I would check the fuse for the parking lamps in the passenger foot well fuse block. Check fuse 6 PK/TLP and relay 43 ALC PRK LP. You may not have relay 43 depending on if the car has the option for twilight sentinel.

This is shown in the schematic posted by Tusmi.

Gary

 

OP claims to have checked out all the fuses. The relay doesn't have anything to do with the parking lights turning on with the MFS switch, it's for the approach light function. OP, do you have approach lights when you unlock the car?