Technical Service Bulletin
97 Q7 Various warnings or functions inoperative, corroded splice points in driver sill. DTC:
U150600,U028400, U020800
47 22 17 2067722/1 August 26, 2022.
Model(s)

Year

Q7

2017 – 2024

SQ7

2020 – 2024

VIN Range

Vehicle-Specific Equipment

All

Not Applicable

Condition
Customer states:
• Various functional issues, instrument cluster messages, failure of displays, lighting, and operational
issues. These issues may include problems with the ambient lighting or the MMI, or it may not be possible
to start the engine.
Workshop findings:
• Various DTC entries may be present in multiple control units.
• Fuse block at the driver side footrest (SB) may have low or no voltage to one or more circuits.
• Junction points under carpet (driver side) are oxidized.
• Driver seat may be inoperative.
• Check engine lamp may be illuminated.
• Ambient lighting may have limited function.

Technical Background
Page 1 of 15
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All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other
intellectual property rights of Audi of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of
this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise,
nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the publisher.

Technical Service Bulletin
In climates where road salts are used to melt snow, it is possible that the heavy salt concentrations enter the
vehicle between the driver-side sill and carpet. When this mixture enters the body harness it is possible that
the splice points at the driver’s sill location become oxidized.

Production Solution
Splice points will be sealed in production.

Service
Due to the various circuits that may be affected, the customer concerns and DTCs vary greatly. As such, the
normal diagnosis should always be carried out first to find a root cause. If the root cause is found to be
related to the oxidized splice points in the driver’s sill area, use the steps below as a repair guide.
Note:
The following chart is a guide for splice points, symptoms, and related DTCs:
Splice

Symptom

DTC

B304

Driver seat inoperative

• No DTC
• U020800 1 Lost Communication with Seat Control Module A

B468

Secondary air

• P041800: Sec. Air Injection System Relay A Circuit
• P225700: Secondary Air Injection System Control “A” Circuit low.

Motor mount

• P157200: Left Electro-Hydraulic Engine Mount Solen.val. Short
circuit to ground
• P157300: Left Electro-Hydraulic Engine Mount Solen.val. Open
circuit

Page 2 of 15
© 2022 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other
intellectual property rights of Audi of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of
this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise,
nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the publisher.

Technical Service Bulletin
• P157600: Right Electro-Hydraulic Engine Mount Solen.val. Short
circuit to ground
• P157700: Right Electro-Hydraulic Engine Mount Solen.val. Open
circuit
Radiator shutter

• U028400: Lost Communication With Active Grille Air Shutter
Module “A”

B698

AC system failure

• U150600: Local data bus no communication
• U150C00: Local data bus 11 no communication

B711

Ambient lighting inoperative

• U150600: Local data bus 5 no communication

Tip: When replacing the terminal 30 power cable, you may freely choose to install the cable using
repair version 1 or 2.
Version 1: Cut the wire ends from the repair cable at the driver fuse block side and splice them into the
vehicle.
Version 2: De-pin the fuse blocks on the driver’s side, and install the repair cable (no cutting).
Below is a brief summary of steps to install the repair cable:
1. Inspect splice points in the driver sill area.
2. Repair all splice points.
3. Test fit terminal 30 cable, mark, and tape service cable.
4. Reinstall cable permanently.
5. Tape the main harness.

Page 3 of 15
© 2022 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other
intellectual property rights of Audi of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of
this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise,
nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the publisher.

Technical Service Bulletin
1. Inspect the splice points for damage.
a.

De-energize the vehicle before beginning repair.

b.

Carefully open the harness tape of the
main vehicle harness located in the area
between the A-Pillar and the B-Pillar on
the driver’s side (Figure 2).

Tip: A locally sourced seam ripper is
useful for this task. Avoid using a razor
blade as this will likely cause unintended
cuts in the wires.

Figure 1: Seam ripper.

Figure 2: Driver side door sill area, open harness to

expose splice points.

2. Repair the splice points.
a.

All splice points in this area must be serviced with VAS 1978 B, ensuring that they are watertight.
Non-oxidized splice points: Seal the splice points using shrinking end caps.
• Part Numbers: 021 972 913 C / 021 972 913 D
Oxidized splice points: Service with VAS 1978 B. Ensure that repaired splice points are watertight.

3. Test fit terminal 30 cable, mark, and tape service cable.

Page 4 of 15
© 2022 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other
intellectual property rights of Audi of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of
this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise,
nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the publisher.

Technical Service Bulletin
There are two ways of connecting the repair cable to the vehicle:
Version 1: Cut the wire ends from the repair cable at the driver fuse block side and splice them into the
vehicle.
Note:
It is important to check beforehand whether there is sufficient space in the area of the driver’s
sill. Depending on vehicle equipment, it may not be possible to use this version due to reasons of
space. Splice points must be staggered.
a.

Connect the repair cable with VAS 1978 B and VAS 631 003.

b.

It is possible to connect the repair wire using crimp connectors so that the individual wires do not
have to be pinned directly into the fuse holder in the footrest. Use VAS 1978 B and VAS 631 003 to do
this.
Use the following crimp connectors:
• 4 mm2: 000 979 943
• 6 mm2: 000 979 943
• 10 mm2: 000 979 944 + 000 979 992 A

OR
Version 2: De-pin the fuse block on the driver’s side, and install the repair cable (no cutting).
a.

Route individual wires of repair cable into fuse block at the driver’s side. Use the chart below to
ensure the repair cable wires are pinned correctly into the corresponding fuse block location.

The stickers on the repair wiring harness are described in more detail in the table below:
Wire number (sticker)

Cross section [mm2]

Fuse position

Description

Page 5 of 15
© 2022 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other
intellectual property rights of Audi of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of
this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise,
nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the publisher.

Technical Service Bulletin
25

6

SB ST 2

Wire already in fuse bar
(red, 12-pin)

206

4

SR2 S123

Fuse 1 for ABS control
unit

210

6

SB ST3

Wire already in fuse bar
(black)

211

6

SB ST3

Wire already in fuse bar
(black)

214

6

J329 (contact 3)

Relay for power supply of
terminal 15

208

6

SB ST5

Wire already in fuse bar
(red, 16-pin)

231

6

J271 (contact 3)

Main relay

207

4

SR2 S124

Fuse 2 for ABS control
unit

56105

4

S44 (contact 1)

Fuse for driver seat
adjustment (vehicles with
electric seat adjustment
only)

87595

4

J757 (contact 3)

Engine component power
supply relay (vehicles
with petrol engine only)

771112

6

S51 (contact 1)

Fuse S51 for automatic
gearbox.

Page 6 of 15
© 2022 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other
intellectual property rights of Audi of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of
this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise,
nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the publisher.

Technical Service Bulletin
Test fit the terminal 30 cable:
a.

Test fit the repair cable in
the vehicle.

b.

Disconnect the existing
cable at E1A, and bolt the
repair cable to the power
supply terminal at the
battery so that the cable
end makes flat contact
with the E1A terminal
(Figure 3).

Figure 3: Power supply location at the battery.
c.

Route the repair cable
along the factory routing
path from the battery to
the LF fuse block as
indicated by the yellow
line (Figure 4).

d.

Ensure sufficient slack
and positioning is
obtained along the entire
routing path.

Page 7 of 15
© 2022 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other
intellectual property rights of Audi of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of
this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise,
nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the publisher.

Technical Service Bulletin
Figure 4: Terminal 30 cable repair routing.