Would like to know where Comfort CAN bus connector strip is located

Aaron Owner/Technician Madison, Wisconsin Posted   Latest  
Resolved
Electrical
2004 Volkswagen Touareg V8 4.2L (AXQ) 6-spd (09D)
Power Windows
Power Locks
Alarm
Turn Signals
Comfort Can Bus

Hey all

I have a 2004 VW Touareg here where the customer while driving suddenly noticed the TPMS light come on. Shortly after he noticed the turn signals didn't work and then when he parked it, the power locks didn't work. I noticed after it was here that the central display screen was still on and that the power windows also don't work. Engine starts up, runs and drives. Scan the Gateway control unit and found fault codes for no communication with steering column J527, display & input J524, tire pressure J502, parking aid J446, driver door J386, LR door J388, comfort bus no signal, comfort bus single wire open circuit. I erased the faults and immediately I always get 01336 "company data bus for comfort system". This was at the end of day Friday. I disconnected the battery ground wire so the battery didn't drain overnight.

This morning I reconnect and just keep getting the alarm now too. LF window does work now too. I accessed the comfort module in the RR luggage compartment panel (not fun when you can't get the trunk to open). Checked the bus wires org/brn and org/grn at the comfort control unit connector with the control unit disconnected: flat 12v on one wire, and 10v intermittent pulsing down to maybe 6v-ish (this changes about +/- 2v). If I plug in the comfort unit and check with the alarm going off, there is no change to the bus voltage. I believe the bus is shorted high. Not sure the exact numbers I should be seeing, but I don't' think its normal.

Here is my #1 question: Is there a Comfort CAN bus strip hidden somewhere in the vehicle? I can't find any service information about it. I feel like that would be the smartest place to go so I can narrow down a leg of the circuit. Please help, thank you!!

Aaron

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Interesting
Jason Technician
Arlington Heights, Illinois
Jason Default
 

You need to check the splice packs on both sides of the Foot wells. They had major issues of corroding From water. You will get all kinds of wonky issues

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Aaron Owner/Technician
Madison, Wisconsin
Aaron Default
 

Yes that's what I'm wondering about! So they are in the sides of the foot wells? Front foot wells? Do you know which side contains the comfort CAN?

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Aaron Owner/Technician
Madison, Wisconsin
Aaron Default
 

Are they just wires spliced together with no connector then?

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Jason Technician
Arlington Heights, Illinois
Jason Default
 

They are just wires spliced together. like taking 6 wires and crimping it in a butt connector. They are on both sides, on the door still right before it hits the kick panel. It will be taped onto the main looms. You can’t miss them. Look up TSBs. Vw has one and shows pictures on the splice packs. The one common one was shifter stuck in park or no start.

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Jason Technician
Arlington Heights, Illinois
Jason Default
 

Here’s a pic of the driver side

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Aaron Owner/Technician
Madison, Wisconsin
Aaron Update
 

Update: checked both front kick panel splice connections: all that I could see look very good/clean. Thanks for the info, Jason! Unfortunately, I can't seem to find specifically the splice connection for the Comfort CAN bus system: Org/Brn + Org/Grn. Will keep searching.

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Aaron Owner/Technician
Madison, Wisconsin
Aaron Update
 

UPDATE: I disconnected the following control units: comfort, tire pressure, all doors, trailer, steering column, access/start, both front seats, vehicle electronics; all with now change: CAN low (org/grn) is shorted to 12v. Since the instrument cluster is the master/gateway, I decided to remove it and check there. ***If I remove the org/grn wire from the green cluster connector and hook…

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Ronald Owner/Technician
Keyport, New Jersey
Ronald Default
 

Not just the kick panel under the floor under the carpet on drivers side

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Aaron Owner/Technician
Madison, Wisconsin
Aaron Resolution
 

Well I ended up removing every single control unit. It wasn't until the very last control unit that I found the short to B+. That seems to be my luck this week haha. Anyway, buried in the LR luggage compartment panel, the Parking Aid control module had a corrosion-filled connector. Multiple pins shorting together through corrosion. Disconnecting the connector wasn't enough; I had to dismantle…

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Thanks