vtraudt

The adaptive air suspension is showing erratic behavior I can't figure out. Some ok for quite some time, sometimes it drops all the way down on one corner.

Various, changing error codes (all of those listed in the TSB 430816 2018765/3).

I want to first change the relay in question J403.
Where is it located?
DIY how to get there (found indication it might be hidden behind the passenger side glove box)?

Preparing for the next step:
DIY how to get the compressor and valve block out?

hrc4u

Overview of relay carrier
1 - Relay carrier in electronics box, right in plenum chamber
q Position of relays, from model year 2005 → page 803/7
q Position of relays, from model year 2007 → page 803/8

Position of relays, from model year 2005
1 - Vacant
2 - Adaptive suspension compressor relay -J403-
2.1 - Vacant
2.2 - Vacant
3 - Glow plug relay -J52- (Diesel), automatic glow period control unit -J179- (Diesel), secondary air pump relay -J299- (petrol)
4 - Vacant

vtraudt

How do I get to position 1 relay carrier and the ominous 'right plenum chamber'?

vtraudt

What is the part number for the J403 relay so I can order and be ready to replace once I dug into the 'right plenum chamber'?

hrc4u

plenum chamber:

relay part nr:4F0 951 253 A

cheers!/H

vtraudt

Plenum chamber = box in engine bay, under windshield drain cover, in front of fire wall.

Right side box also houses ECU.

There are 2 relays both with 373 stamped on them.
Both are part number 8D0951253C.

Which one is the adaptive air suspension (compressor) relay?

I read that the 373 is interchangeable with 204 and 214. Can someone confirm?

vtraudt

which position is the J403 suspension compressor relay?
the one towards passenger side fender?

Alexander Den Engelsman

Sorry for bumping this old topic. But face the same problem. Which one is the relais for Air Suspension? Because I bought Audi Relais 645. Which is different than 373 relais.

bagpipingandy

it is a 40 Amp relay, but do you need to know its location also? if so Is your allroad a C5 or C6?

best regards

Andy

cosmobeauregard

I found that in my case the reason for the water migration into the Plenum was a improperly fitted ECU cover. The outboard aft corner left a gap right where the windshield wiper close out panel met this cover. I had never had this cover off so possibly a dealership issue. Its worth a look. The ECU Cover is a major pain to put back in and have it seal properly.