Dipped Headlight; no HID

[lyleswk]

At a loss. I have an 03 with normal halogen lights. Both my headlights went out in quick succession, i.e. within 2 days. The symptoms are the dipped headlight fault on the dash and the obvious no lights. I have not done any maintenance in that area in 6 months, i.e. I have only pulled the the connectors and assemblies to get the front clip into the maintenance position to deal with my FCM last August. All the rest of my lights work; fogs, blinkers, etc. I have read about a "BCM" but little to no details on it. Any pointers?

[imnuts]

Do you just need to replace both bulbs? If you have halogens, and all other lights are working, I'd start by checking & replacing the bulbs.

Sent from my Pixel 2 XL

[lyleswk]

I tried replacing one before I posted with no results.

[shurur9]

I tried replacing one before I posted with no results.

Did you pull the fuse for the adjustable headlights?
That will at least make that fault not show on the dash.

I fouled mine up by messing with the lights while lights were on.

Test the pinouts for power on the connectors going to the headlights first...pins 5 and 10 for low beam..1 and 8 high beam

http://www.audizine.com/forum/showth...Wiring-Diagram

[imnuts]

Did you pull the fuse for the adjustable headlights?
That will at least make that fault not show on the dash.

Halogens don't have the range motors, controller, or fuse for the level function.

Have you checked the wiring? If it isn't the bulbs, them it's time to start tracing wires. You could scan with VCDS, but I'm not sure what fault(s) may be stored, if any.

Sent from my Pixel 2 XL

[shurur9]

Halogens don't have the range motors, controller, or fuse for the level function.

Have you checked the wiring? If it isn't the bulbs, them it's time to start tracing wires. You could scan with VCDS, but I'm not sure what fault(s) may be stored, if any.

Sent from my Pixel 2 XL

I thought a dipped headlight fault is part of the level function.
and that is what he said he is getting....anyway..yes check from the headlight plugs and follow back.

VCDS will report each light that is not working.

stuff like this:

Address 09: Cent. Elect. Labels: 8E0-907-279-8E2.lbl
Part No: 8E0 907 279 E
Component: int. Lastmodul USA 0305
Coding: 00013
Shop #: WSC 63351
VCID: 3431E266B726FFE78F2-4B1E

6 Faults Found:
01494 - Bulb for Parking Lamps; Left (M1)
57-00 - Electric Circuit Failure
01498 - Bulb for Parking Lamps; Right (M3)
57-00 - Electric Circuit Failure
01495 - Bulb for High-Beams; Left (M30)
57-00 - Electric Circuit Failure
01499 - Bulb for High-Beams; Right (M32)
57-00 - Electric Circuit Failure
01493 - Bulb for Blinkers; Front Left (M5)
57-00 - Electric Circuit Failure
01497 - Bulb for Blinkers; Front Right (M7)
57-00 - Electric Circuit Failure

I actually had all my lights fail and thought it must be the BCM.
It was my lights..and months in the FL rain.

[old guy]

Dipped headlight is just Germanspeak for low beam. It has nothing to do with levelers.

[shurur9]

Dipped headlight is just Germanspeak for low beam. It has nothing to do with levelers.

thanks.

[lyleswk]

Dipped headlight is just Germanspeak for low beam. It has nothing to do with levelers.

Ah, that makes sense. Guess I'll start running wires. Any where that there would be common wiring since both went out nearly at the same time?

[BARRY]

ya...your lowbeam light is having an issue.

[ErikG]

@ shurur Yikes, i would have assumed the BCM too. All in one go!?!?!
@old_guy yup, i have done extensive research on the dipped headlight and that was one of the first things i wish i would have learned. Just kept assuming that dipped meant movement on the autolevelers.

@OP, So lights went out and you replaced with new bulbs and they are still out correct? Maybe its a relay?

[lyleswk]

Yes, bulbs didn't work. Don't know on electrical; haven't had time to run any electrical yet. I was able to find a wiring diagram that I think is for the A4 and will start work this weekend. Oh, I and I am very electrically challenged, so wish me luck. Can't drive the car to work since it's dark when I go and dark when i come home. The S5 is fun to drive though

[shurur9]

Yes, bulbs didn't work. Don't know on electrical; haven't had time to run any electrical yet. I was able to find a wiring diagram that I think is for the A4 and will start work this weekend. Oh, I and I am very electrically challenged, so wish me luck. Can't drive the car to work since it's dark when I go and dark when i come home. The S5 is fun to drive though

http://www.audizine.com/forum/showth...Wiring-Diagram

Use the pinout to the headlights and start checking back from there.
The thread above has a connector diagram..Make sure to turn the light switch on...

[lyleswk]

Thanks for the diagram. Got the same thing on my FCM and was able to pinpoint fairly quickly. Will let you know how things go. My guess is no voltage a the connector since my hi beams don't work either.

[lyleswk]

Finally had time to do some troubleshooting and am looking for any pointers. Again, my low beams do not work and I have the dipped headlight fault on both, but all the rest of the my lights work including high beams (not this is a bit different than what I have said above).

1) I started with the connector at the headlight unit and confirmed I do not have voltage at the connector on either side. Since the harness disappears into the firewall, I opted to go to 2)
2) Using the wiring diagram I found here: http://www.vaglinks.com/Docs/Audi/B5...ingDiagram.pdf, I removed the headlight switch and measured the voltage for each position on the appropriate wire. The next stop was the CECM. When I disconnected the harness that goes to the lights, I measured the voltage from the pins on the CECM and measured 8 volts. Not sure if that is expected, but I get voltage. That along with 3) makes me think that I don't have a CECM issue. The harness then disappears into a 2 inch bundle of wires.
3) I have run VAGCOM on the CECM and found no faults. Will also note that the green light symbol on my dash comes on, but it is unclear whether that light is in line with the actual headlight or a separate signal from the CECM.

So i think it's obvious I am shorting out somewhere in the harness. Any hints on troubleshooting other than start digging? Does the harness just run through the firewall with no connectors?

[shurur9]

Finally had time to do some troubleshooting and am looking for any pointers. Again, my low beams do not work and I have the dipped headlight fault on both, but all the rest of the my lights work including high beams (not this is a bit different than what I have said above).

1) I started with the connector at the headlight unit and confirmed I do not have voltage at the connector on either side. Since the harness disappears into the firewall, I opted to go to 2)
2) Using the wiring diagram I found here: http://www.vaglinks.com/Docs/Audi/B5...ingDiagram.pdf, I removed the headlight switch and measured the voltage for each position on the appropriate wire. The next stop was the CECM. When I disconnected the harness that goes to the lights, I measured the voltage from the pins on the CECM and measured 8 volts. Not sure if that is expected, but I get voltage. That along with 3) makes me think that I don't have a CECM issue. The harness then disappears into a 2 inch bundle of wires.
3) I have run VAGCOM on the CECM and found no faults. Will also note that the green light symbol on my dash comes on, but it is unclear whether that light is in line with the actual headlight or a separate signal from the CECM.

So i think it's obvious I am shorting out somewhere in the harness. Any hints on troubleshooting other than start digging? Does the harness just run through the firewall with no connectors?

OK..First I would make doubly sure that the BCM module is coded for the low beam lights that you have.
Halogen or HID.

Then I might consider swapping in a used BCM ($)...maybe borrow a friends for troubleshooting..
rev E... rev F works with the newer auto lights option and would probably need to be adapted.

That 8v reading is a bit troubling...what signal or pin?

[shurur9]

Also..maybe put up a pic for us of that green light on the dash please...

[shurur9]

Green light may just be the hi beam...the turn signal and beam switch are also involved.

[lyleswk]

At work, so don't have access to the car, but the green light is the one between "EPC" and the blue high beam. Manual says it just indicates the headlights and side marker lights are on, so that is normal.

Actually, 4 pins: numbers 16 (right low beam), 18 (left low beam), 22 (right high beam), and 23 (left high beam). All had 8 volts with it disconnected. So you are saying the module may be bad even though all the other lights work fine?

[EuroxS4]

Check for water in the comfort module.Also make sure the ebox isnt cracked.thats whwere they always leak water into the car.

[lyleswk]

Check for water in the comfort module.Also make sure the ebox isnt cracked.thats whwere they always leak water into the car.

If you mean the electronics module, there is none there. I have no evidence of water intrusion anywhere in the pillar area that might get to the Electronics Module.

[EuroxS4]

There is no water or no module??


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[ak0913]

Can it be the headlight switch?

[shurur9]

At work, so don't have access to the car, but the green light is the one between "EPC" and the blue high beam. Manual says it just indicates the headlights and side marker lights are on, so that is normal.

Actually, 4 pins: numbers 16 (right low beam), 18 (left low beam), 22 (right high beam), and 23 (left high beam). All had 8 volts with it disconnected. So you are saying the module may be bad even though all the other lights work fine?

I don't recall my light connector voltages being that low.
All were 11V+

[lyleswk]

I checked the switch and got 12 volts when in the on position.

shurur9, you are talking at the Electronics module?

[shurur9]

I checked the switch and got 12 volts when in the on position.

shurur9, you are talking at the Electronics module?

Yup.

I don't know the pin out of the BCM or what the 8V pin was.
There are two connectors on that module.
It seems like maybe your BCM is bad or the stalk switch.

I don't have system schmatics in front of me.

[lyleswk]

Guess I will go check to see if I get 8 volts on the working circuits.