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Post by sofro1988 on Dec 19, 2022 10:26:01 GMT
Hi, I got a problem with the passenger heated mirror. if I unplug the heating element, I got 12v power from the cable, but when I plug the glass to both of the cables, the power goes to 0v. as I disconnect one of the two cables, the power back to 12v. any suggestion? thanks
ps: I have already tried another glass, same result. I even tried to swap the two mirror, and the result was the same. driver side works and passenger side doesn't work.
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Post by vwjap on Dec 19, 2022 18:07:51 GMT
Try popping the minus to earth via a different lead, could be dodgy earth,
Or make sure the v+ supply doesn’t have any corrosion on it (and the fuse)
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Post by dv52 (Australia) on Dec 19, 2022 21:45:27 GMT
Hmm......simple diagnostic logic = if you have tried another heater element and the same fault remains - then clearly the problem lies in the equipment that has NOT altered!!!
Here's how the various pieces of equipment are wired together on the passenger-side mirror:
As you can see - it's a very simple arrangement. The only complication for the heater is the coupling point labelled "Z2" - this is an earth potential join that forms the negative voltage return path for the 2 x LED circuits. Do these LEDs operate correctly?
If this was my car - I would disconnect the wire on pin #2 on the repeater bulb fitting. This should entirely isolate the heater circuit. Try the voltage readings again in this mode.
If the same measurements result, then it suggests (to me) that the power supply inside the passenger door module isn't capable of providing the required electrical current to the heater element (which will be relatively high Amps). This power supply should be self protecting - meaning that it should automatically shut-down when it senses too high a load. Of course the threshold current for shut-down should be higher than the load of heater element for a healthy power supply!!!
Maybe also measure the resistance of the heater elements on both passenger and driver sides - are they the same?
The other possibility (less likely) is the integrity of the Blue/Back wire and the "Z2" Black wire. If the repeater LED is working OK - then this possibility can be discounted
What is the precise error message on your SCAN report?
Don
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Post by sofro1988 on Dec 20, 2022 11:19:21 GMT
I have tried to use the door lock as a ground, always the same result. indicator and puddle led light function correctly. I don't have the entry light on the door. I also tried to swap the passenger module with another one, I have programmed it, but still the same result. in obdeleven I don't have any error on the passenger module. The only error I have got is related to the gateway, code U112400, data bus, additional installations detected. I don't know what is that error. everything works right, except the passenger heated mirror. it can't be the fuse since the driver one is working, can it be? I don't remember the resistance value. I'm gonna try Saturday (I don't have with me the multimeter).
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Post by dv52 (Australia) on Dec 20, 2022 19:52:40 GMT
hmm........ OK, if there are no error messages on the passenger side door module- it means that the module is perfectly happy with the status of the heater element. How did you measure the voltages? Re-look at my wiring diagram - notice that the negative voltage return path for heater element (and for the LEDs) does NOT use the car body as ground (the heater has its own earth wire which floats above the car's metal "ground"). So, if you applied the the negative multi-meter lead to a metal earth point on the car - it's an incorrect voltage reading!! Also, the error message on the Gateway module suggests that the coding on this car has been altered. Is it possible that someone has tinkered with the long-code string on the passenger door module?
The software switches for the passenger mirror heater are on Byte 4, Bit 0 and also Byte 4, Bit 5 if the heater has a PTC (Positive Temperature coefficient). Maybe also check the status of these software switches
Don
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Post by sofro1988 on Dec 20, 2022 23:47:31 GMT
The first reading was with the cable plugged to the mirror. The second read was using the ground from the car. I have checked in the Obdeleven history and there is not byte 4 bit 0 ticketed. Maybe tomorrow morning I’ll try to mark that bit. About ptc I don’t have it (even the driver side has been set as normal heater and not ptc). Do you know the bit in long coding for heating in driver module as well?
---------------------------------------------------------------
19 Gateway
System description: GW MQB High
Software number: 3Q0907530AA
Software version: 4366
Hardware number: 3Q0907530C
Hardware version: 442
Faults:
U112400 - Data bus
Additional installations detected
static
Priority - 2
Malfunction frequency counter - 34
Unlearning counter - 40
km-Mileage - 169845 km
Supply voltage, terminal 30 - 12.0 V
Terminal 15 - On
Unknown ambient data -
date - 2022-12-10 16:26:38
I tried one hour ago to mark the bit 0. it didn't work and I have also noticed that marking that bit, change mirror heating from "installed" to "not installed" in the tab with the car icon.
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Post by dv52 (Australia) on Dec 21, 2022 21:12:59 GMT
Yes, Byte 4, Bit 0 on the passenger door module is a "negative" software switch - meaning that when this switch is set (i.e. when the Bit is ticked in the OBD11 long-code screen), it signifies that there is NO heater installed. The normal factory value is not-ticked Also, Byte 4, Bit 0 has the same function on the driver-door module (it should likewise be not-ticked)
Finally, the error message on the Gateway module suggests that there is one, or more modules on this car that has NOT been registered in the Gateway Installation List. I'm not sure if this fault is related to your heater problem, but it could be that the missing module is the passenger door module?
Go to the Control Units screen (see below) and navigate to the passenger door module. This module will have the number 52 enclosed in a colored tab - similar to the modules shown in my screenshot.
If the passenger door module is correctly registered in the Gateway Installation List, the colored tab will be either green, or red (green=no faults in module, red= module contains errors). If the colored tab is either black, or yellow, it means that there is a problem with the registration of this module.
If the colored tab is the correct color for the passenger door module, scroll-down the screen. Are any of the colored tabs either black, or yellow?
Don
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Post by sofro1988 on Dec 21, 2022 21:34:48 GMT
On the iPhone Is a little bit different. Shall i try to use the function “autocode” ? I have a spare android phone. Is safe to use it?
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Post by dv52 (Australia) on Dec 21, 2022 21:37:29 GMT
Yes, perfectly safe to use Autocode function
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Post by sofro1988 on Dec 21, 2022 21:43:30 GMT
I’m gonna try tomorrow. This afternoon I checked the modules obd scans at the beginning and they match the ones marked in the gateway list, but maybe autocode may help me. What do you think if I try to measure the voltage on the heater cable with the turn indicator blinking? Can be a good testing for the ground cable?
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Post by dv52 (Australia) on Dec 22, 2022 1:37:15 GMT
hmm..... you have already said that the 2 x LEDs work correctly - but try (it won't do any harm)! Again, here's the circuit:
Maybe try this:
- Disconnect the wires on pin#3, pin#1 and pin#11 on the module
- Disconnect the 2 x heater wires
- Measure the resistance between the Black/Blue wire and the metal body of the car.
- You should get an infinite resistance because the negative voltage return path for the heater/LEDs is totally isolated from the car earth
Don
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Post by sofro1988 on Dec 22, 2022 13:09:51 GMT
I have tried to use an Android device but I didn't get any Autocode list message. How can I force the pop-up to come out? How does it work? thanks
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Post by dv52 (Australia) on Dec 22, 2022 20:33:50 GMT
Read THIS . Autocode works in the background - but as I have already said, unless the "colored tab" around the number 52 in the Control Unit screen is NOT either red, or green (it will be colored yellow if the module isn't included in the Gateway Installation List), the passenger door module's registration is OK
Don
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Post by sofro1988 on Dec 24, 2022 7:50:21 GMT
I have fixed the error on the gateway. Today I’m going to try to fix the heating mirror if I have time to do it. Now I also have one more issue with the car heating, but I read that is very common in vag cars.
I got some news about the mirrors. It’s very strange.
Working mirror:
Engine off , key on and heating switch off: 0v
Engine off , key on and heating switch on: 4v
Engine on , key on and heating switch on: 12v
Then if I plug the glass it keeps 12v
Not working mirror
Engine off , key on and heating switch off: 12v
Engine off , key on and heating switch on: 12v
Engine on , key on and heating switch on: 12v
Then if I plug the glass it goes to 0v
Any suggestion?
Thanks a lot
Both of the glasses have 6ohm
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Post by dv52 (Australia) on Dec 24, 2022 20:42:56 GMT
hmm..... stuffed module - maybe (I assume that the measured volts are between pin #3 and pin#15 on the module (not at the heater terminals)?
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Post by sofro1988 on Dec 25, 2022 6:37:50 GMT
I didn’t have any time to take off the panel door yesterday, so I measured the voltage form the mirrors
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