Technical Service Bulletin
97 Q8 Various warnings or functions inoperative, corroded splice points in driver sill. DTC: U150600,U028400,
U020800
97 22 86 2067785/2 August 29, 2022. Supersedes Technical Service Bulletin Group 97 number 22-85 dated August
26, 2022, for reasons listed below.

Model(s)

Year

Q8

2019 – 2023

SQ8, and RS Q8

2020 – 2023

VIN Range

Vehicle-Specific Equipment

All

Not Applicable

Condition
REVISION HISTORY
Revision

Date

Purpose

2

-

Revised Warranty (updated claim types)

1

08/26/2022

Initial publication

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.

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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
• 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.

Technical Background
Ambient lighting may have limited function.
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

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
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
• 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:

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© 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 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.

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 2: Driver side door sill area, open harness to expose
Figure 1: Seam ripper.

splice points.

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© 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
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.
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

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
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
Wire already in fuse bar

226212

6

SB 8

(red, 12-pin)

226206

4

SR2 S123

Fuse 1 for ABS control unit
Wire already in fuse bar

226209

6

SC 3

(black)
Wire already in fuse bar

226210

6

SC 10

(black)
Relay for power supply of

226211

6

J329 (contact 3)

terminal 15
Wire already in fuse bar

226208

6

SE 6

(red, 16-pin)

226213

6

J271 (contact 3)

Main relay

226207

4

SR2 S124

Fuse 2 for ABS control unit

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
Driver seat adjustment
thermal fuse (vehicles with
electric seat adjustment
56010

4

S44 (contact 1)

only)
Engine component power
supply relay (vehicles with

87321

4

J757 (contact 3)

petrol engine only)
Fuse S113 for automatic

771035

6

S113 (contact 1)

gearbox

Test fit the terminal 30 cable:
a.

Test fit the repair cable in
the vehicle.

b.

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

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.