Help with PQ25 Max BCM and bi-xenons

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Amarokdriver01
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Re: Help with PQ25 Max BCM and bi-xenons

Post by Amarokdriver01 » Mon Aug 14, 2017 10:53 am

Testing has stopped as I can not locate my scope. I think it has been lent to somebody.
All I can confirm with using a DMM on the headlight connector is that: (all this has been done without engine running)
With only DRL Led on - Pin 4 & Pin 10 have 12.2v
In any condition when the DRL should be Dimmed - Pin 4 has 12.2v & Pin 10 has 3.7v

Remember the pin 10 is now my new (B5 & B6 fed) wires.
The original (side light) Wires that were feeding pin 10 work in reverse
So, When DRL is on they have 1.1v, when DRL should be Dimmed they have 12.1v.
This is all just as I was expecting.

I think the low (3.7v and 1.1v) readings maybe because I have removed the connector to test. Maybe this would drop to 0v if I correctly back-probed the connectors and tested them under load.

My other thought is that the 3.7v is actually a PWM reduced level for the dimming.
I have read that the Led driver will not run below 50% setting, The 3.7v would equate to a setting of 31%. however it does not look like there is any code or adaption channel in my bcm to raise this level.

Adaption Channel 34 is currently set at 30. I would be expecting to see at least 2 channels set at that if it was the level?
Any ideas what 34 is responsible for?
If I can do any harm by trying to change it to 100 for testing?

@ Adam87
I am in Somerset, on the Wiltshire border, near Longlete.
Where abouts are you?

Thanks!!

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Re: Help with PQ25 Max BCM and bi-xenons

Post by Adam87 » Mon Aug 14, 2017 12:34 pm

I'm not sure with PQ25 BCM, but for others with lamp monitoring, when a bulb out error is detected, it would drop out the voltage to the lamp, so no reading normally. As I said I'm not sure with the 7H0 BCM.

I guess this may be possible to up the voltage with an eeprom edit?.

Ah I'm miles away, I'm up in Warrington.


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Re: Help with PQ25 Max BCM and bi-xenons

Post by ciclo » Mon Aug 14, 2017 8:40 pm

Adam, any BCM from T5.2 or T6 that it's setup from the factory for Bixenon or LED headlights will make work the Amarok's front Led modules.
Example: T6 ---> 7E0937090 for LED headlights (8IT).

It is necessary to do a road test and check that there are no faults in other units, for example Differential Lock and Transfer box control units, if they are installed.

---
Amarokdriver01
The original wires that were removed/isolated are still connected to the rear parking/side lights (taillights) on the same side and logically to the BCM, T73a / 40, T73a / 41.
... your factory BCM thinks you've removed the bulbs ... :lol:

The new wires (T73b/5, T73b/6 to headlamps) are exclusively dedicated to the front parking/side lights in case of Bixenon/LED headlamps with additional Led modules for parking/side lights and DRLs. In order for the BCM and LED control unit (in your case) to be able to manage them (all possible functions)*.

*There are several Bits in the BCM PQ25 (vcds longcode) for/dedicated to parking/side lights.

---

Channel 34 is dedicated to static cornering lights. Not related with...
viewtopic.php?f=56&t=58703&start=3000#p517482

Adam87 wrote:
Mon Aug 14, 2017 8:38 am
@Ciclo, is the BCM currently installed not capable because of HW or SW? maybe edit EEPROM?

This is the same problem that firegrafik, iichel and CNK had when they installed the original LED Headlamps (6C) with the additional control unit for the LED module on their 6R.
They had to install a T6 BCM with 8IT Pr-code. (like the first 7E0 that I installed for Light Assist)

Once installed everything started to work properly on their LED headlights without additional encodings for this, or changes in the adaptation channels.

Draw your own conclusions...

Amarokdriver01
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Re: Help with PQ25 Max BCM and bi-xenons

Post by Amarokdriver01 » Tue Aug 15, 2017 8:57 am

ok, I will try to find the correct ecu.
I think Differential Lock and Transfer box are only mechanical. I will look at this in more detail.
Ideally I will replce with a current Amarok bcm as it would be the best oem way.

I will see the dealer and find a price for a new one and look for used units.

Adam - Let me know if you have anything that should work!

Thanks guys!!

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Re: Help with PQ25 Max BCM and bi-xenons

Post by Adam87 » Tue Aug 15, 2017 11:13 pm

Just had a quick look through BCM programmer, maybe not this channel, but it shows PWM can be adjusted, I may increase brightness to dimmed LED's but, I can't see this being set wrong from factory?
Image


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Re: Help with PQ25 Max BCM and bi-xenons

Post by ciclo » Wed Aug 16, 2017 7:14 am

TEST MODE

Once it is clear that the problem would be solved with a BCM Max 7H0937090D or higher (PR codes 8IH, 7L6... in case of 7H0), the following Bytes/Bits in the BCM influence the operation of the parking lights, ... if you want to do tests.

Apart from the already known:
(note: orientative definitions)

; LC, 11.1, Diagnostic. Additional parking/side lights. ???
; LC, 11.2, PWM. Additional parking/side lights. ???
; LC, 11,3, Additional parking/side lights. Installed. ???

; LC, 21.6, Parking lights on both sides. ???

; LC, 22.0, ???
; LC, 22.3, Drls installed. ???

; LC, 23.5 Parking lights. Full brightness.

; LC, 24.0 ???
; LC, 24,1 Slight delay in lights to go ON (when the switch is turned).


Because these Bytes/Bis are enabled or disabled (1 or 0) depending on the equipments installed (H4, H7, Bixenon, BCM type, etc) and also because of the large number of VW models that use the BCM PQ25 it is highly likely that they will not have a noticeable effect on many BCM PQ25 models.

Byte18 is required to remain at 65 HEX during testing (Amarok Bixenon).

BCM coding from Amarok Bixenon with 7H0937090D (2015)
350002384C63140093380E316CCB96DD0F80654E60803041300000030003

BCM coding from Amarok Bixenon with 7E0937090A (2017)
240002380C61140093380F316CCB86D4B280654F60CC7160310000030803

Without FAULTS.

If you want, compare from Byte11 onwards:
The configuration of Byte23 and Byte28 depends on how the wiring is installed for High beam.
Any BCM 7E0 can operate in BCM 7H0 mode.

I hope this information can be understood due to the way I express it. :oops: (I know what you see written, nothing more)

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Re: Help with PQ25 Max BCM and bi-xenons

Post by Amarokdriver01 » Wed Aug 16, 2017 9:38 am

Looking at my adaptions map, I don't have any values set from the factory to 100.
The highest value I have (unidentified) is ch37 with a value of 80.
(ch60 & ch61 have values of 200 but these seem to be releated to the alarm sensors (tilt & ultrasonic sensitivity)

II have read some information on cars that use the same controller and it does seem like the led drivers will only run as low as 50%. Any less they switch off. Like you say, I would expect it to be pre set from the factory.
I have tested some of the channels but there are about 20 left. I will keep trying to identify them!



ciclo wrote:
Wed Aug 16, 2017 7:14 am
TEST MODE

Once it is clear that the problem would be solved with a BCM Max 7H0937090D or higher (PR codes 8IH, 7L6... in case of 7H0), the following Bytes/Bits in the BCM influence the operation of the parking lights, ... if you want to do tests.

Apart from the already known:
(note: orientative definitions)

; LC, 11.1, Diagnostic. Additional parking/side lights. ???
; LC, 11.2, PWM. Additional parking/side lights. ???
; LC, 11,3, Additional parking/side lights. Installed. ???
On Amarok-
11.0 = 0 + 11.1 = 0 then - halogen 65w bulb max
11.0 = 0 + 11.1 = 1 then - xenon shutter 12w max
11.0 = 1 + 11.1 = 0 then - I do not know :)

; LC, 21.6, Parking lights on both sides. ???

; LC, 22.0, ??? Dipped AND parking lights ON in DRL position of light switch (not tested as I have auto' light switch)
; LC, 22.3, Drls installed. ???

; LC, 23.5 Parking lights. Full brightness. This is what I would expect to make my led come on. I know the power from the bcm 5&6 will run the led as it is full power when parking lights turned off to drive drl. It does not work changing this when I would expect it to simply drive the wires the same as it does in drl mode???

; LC, 24.0 ??? Parking Lights turned OFF with low beam active, (did not notice if it turned of rear parking lights as well, will check)
; LC, 24,1 Slight delay in lights to go ON (when the switch is turned).
24.1 Display for Limit Light (I think this is dash icon for low beam ON)
24.2 Delay for light switch
(possible I have noted it wrong and 24.1-24.2 are reversed


Because these Bytes/Bis are enabled or disabled (1 or 0) depending on the equipments installed (H4, H7, Bixenon, BCM type, etc) and also because of the large number of VW models that use the BCM PQ25 it is highly likely that they will not have a noticeable effect on many BCM PQ25 models.

Byte18 is required to remain at 65 HEX during testing (Amarok Bixenon).

BCM coding from Amarok Bixenon with 7H0937090D (2015)
350002384C63140093380E316CCB96DD0F80654E60803041300000030003

BCM coding from Amarok Bixenon with 7E0937090A (2017)
240002380C61140093380F316CCB86D4B280654F60CC7160310000030803

Without FAULTS.

If you want, compare from Byte11 onwards:
The configuration of Byte23 and Byte28 depends on how the wiring is installed for High beam.
I have only got as far as byte 24.2. I do not know the function of any of the bytes above this yet...
Any BCM 7E0 can operate in BCM 7H0 mode.

I hope this information can be understood due to the way I express it. :oops: (I know what you see written, nothing more)

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Re: Help with PQ25 Max BCM and bi-xenons

Post by Adam87 » Wed Aug 16, 2017 4:38 pm

Unfortunately VCDS won't be able to edit all parameters in this list as this is editing the eeprom directly


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Re: Help with PQ25 Max BCM and bi-xenons

Post by Adam87 » Wed Aug 16, 2017 10:45 pm

@Amarokdriver01, I have a BCM for you to borrow to test, 7H0 090, came from a T5 with factory xenons


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Re: Help with PQ25 Max BCM and bi-xenons

Post by Adam87 » Fri Aug 18, 2017 8:00 am

I wonder if it's possible to add component to the board to add features, fog lights, cruise etc, here is the inside of a 7E0 937 090, you can see some solder pads where components could go
Image


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Re: Help with PQ25 Max BCM and bi-xenons

Post by Amarokdriver01 » Thu Aug 31, 2017 11:52 am

Just a quick update,
I have ordered a vag can pro which I am still waiting for.
If I can't get any further with that I will look into swapping the bcm.

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Re: Help with PQ25 Max BCM and bi-xenons

Post by ciclo » Thu Aug 31, 2017 7:25 pm

That's fine. We look forward to your results. :wink:

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Re: Help with PQ25 Max BCM and bi-xenons

Post by Amarokdriver01 » Sun Sep 17, 2017 7:40 pm

I have got my vag can pro.
I can connect to bcm and see the coding etc. There do not appear to be any label files for the amarok though.
I can enter adaption and see the same as vcds (again, no label file in vcp)

If I try to use the PQ25 programmer I get an error and It will not connect to the bcm?

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Re: Help with PQ25 Max BCM and bi-xenons

Post by Amarokdriver01 » Sun Sep 17, 2017 7:48 pm

When I close the pq25 programmer I get the following log..

Opening communication with ecu...
Reading identification...
ECU: 7H0937090 J519 BCM PQ25 MAX4
Opening communication with ecu...
Reading identification...
Reading data...
Sending seed request...
SEED received.
Error entering security mode

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