TIS Service Bulletin

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SI B72 04 17
Safety Belts and Accessories (Body)

January 2019
Technical Service

FALSE WARNINGS THAT THE FRONT PASSENGER SEAT IS
OCCUPIED WITHOUT THE SEAT BELT BUCKLED
New information provided by this revision is preceded by this symbol

.

This Service Information bulletin supersedes SI B72 04 17 dated January 2019
What’s new:
• New Diagnosis Chart / Flowchart for F90/G05 attached

MODEL
G12 (7 Series)
Vehicles produced to
July 2018

G30 (5 Series)
Vehicles produced to
July 2018

G32 (6 Series Gran
Turismo) Vehicles
produced to July 2018

G02 (X4) Vehicles
produced to July 2018

F90 (M5) Vehicles
produced to August
2018

G05 (X5) produced
from July 2018 to
September 2018

G01 (X3) Vehicles
produced to July 2018

SITUATION
Acoustic and visual warnings indicate that the front passenger seat is occupied and the seat belt is not
fastened, when the seat is actually unoccupied.
If the situation is currently present, sit in the seat and move the seat to a different position then the POL
(Passenger Occupancy Light) light will function correctly.
In some cases the Air bag Warning Light was illuminated. Advanced Crash Safety Module (ACSM) fault
“930A1C - Front passenger seat occupancy detection transmitting fault (moisture)” is stored.

CAUSE
1. Electronics (for example smart phones or laptops) are connected to the USB charging port or cigarette
lighter and placed on the seat.
2. The seat was wet (e.g. very high humidity, spilled liquids or rain).
3. Faulty plug connection to Evaluation Electronics CIS (Capacitive Interior Sensing).
4. Excessive spacing between seat mat sensor signal wires and their grounding shield sleeve.

CORRECTION


Drying the seat mat due to moisture.



If there is no moisture, secure loose cables and install 2 cable ties

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

If the 2 cables ties are already installed properly, replace the seat mat



Statement added to SI – do not replace the CIS electronics or the ACSM module for this situation

PROCEDURE
For conditions that are similar to the situation described above:
1. Verify with customer that no objects were lying on the seat that could have caused the warnings.
Note: Electronic devices that are placed on the front passenger seat, e.g. laptop computers, mobile
phones, etc., could cause the front passenger airbag warning lamp to activate.
This behavior occurs primarily with devices that are connected to the vehicle electrical system via a USB cable
or other charger adapter.
In vehicles with an acoustic seat belt warning, this could cause the warning signal to sound.
2. Moisture on the seat surface can also cause a faulty seat occupancy detection. In this case ACSM fault
930A1C will be stored. Check for signs of moisture. If moisture is found, then dry the mat and clear the
fault. If no moisture is found proceed to the next step.
3. If step 1 and 2 do not identify the cause of the warnings, access the label on the seat mat harness and
follow the attached diagnosis flow chart. If the flow chart recommends installation of 2 cable ties, proceed
to step 4.

The example to the left shows an AI index of 01

4. Install 2 cable ties on the seat wiring harness as shown in the attached repair instructions and in this
video https://tinyurl.com/V520218
a. Set the cable tie tightening tool adjustment to 3.75 when securing the cable ties.
b. The cable ties ONLY GO AROUND THE WIRING HARNESS. Do not attach the cable ties to the seat
frame.
c. The purpose of these two cable ties is to tighten the ground shield sleeve around the two signal wires.
5. Check the validity of the repair by ensuring no faults or check control messages are displayed.

PARTS INFORMATION
Part Number

Description

Quantity

61 13 8 377 065

Cable tie

2

Refer to ETK

CIS seat mat

1 if needed

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Note: Replacing the CIS electronics or the ACSM module will
not correct this issue.

WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty for Passenger Cars and Light Trucks.

Defect Code:

6577081400

Labor Operation:

Labor Allowance:

Description:

65 99 000

4 FRU

Work time to secure the CIS cable under the
seat (Main work)

2 FRU

Work time to secure the CIS cable under the
seat (Plus work – Vehicle is already in the
workshop)

Refer to KSD/AIR

Replacing seat cover for front passenger seat

Refer to KSD/AIR

Additional work: Heating element, seat

Or:
65 99 000
Or:
52 14 903
And, as applicable:
52 14 982

Posted: Tuesday, January 15, 2019

ATTACHMENTS
View PDF attachment B720417_Diagnosis_Chart.
View PDF attachment B720417_Repair_Procedure.
[ Copyright ©2019 BMW of North America, Inc. ]

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Start G12

Check if Seat Mat Label Index (AI)
>= 10 (Basic) / 11 (Comfort Seat
with memory)?

yes

Create Puma Case
including picture of
Seat Mat Label

no

Check if cable ties are attached to
cable as described in
SI B72 04 17?

yes

Replace Seat Mat

no

no

Attach cable ties as described in
SI B72 04 17

Check if New Seat Mat Label
Index (AI)
>= 10 (Basis) / 11 (Comfort Seat
with memory)?

yes

End.

Start G30 / G32

Check if Seat Mat Label Index (AI)
>= 11 (Comfort Seat with
memory) / 05 (Sport)?

yes

Create Puma Case
including picture of
Seat Mat Label

no

Check if cable ties are attached to
cable as described in
SI B72 04 17?

yes

Replace Seat Mat

no

no

Attach cable ties as described in
SI B72 04 17

Check if New Seat Mat Label
Index (AI)
>= 11 (Comfort Seat with
memory) / 05 (Sport)?

yes

End.

Start G05 / F90

Check if Seat Mat Label Index (AI)
>= 05

yes

Create Puma Case
including picture of
Seat Mat Label

no

Check if cable ties are attached to
cable as described in
SI B72 04 17?

yes

Replace Seat Mat

no

no

Attach cable ties as described in
SI B72 04 17

Check if New Seat Mat Label
Index (AI)
>= 05

yes

End.

Start G01 / G02

Check if Seat Mat Label
Index (AI) >= AI06 ?

yes

Create Puma Case
including picture of
Seat Mat Label

no

Check if cable ties are attached to
cable as described in
SI B72 04 17?

yes

Replace Seat Mat

no

no

Attach cable ties as described in
SI B72 04 17

Check if New Seat Mat Label
Index (AI) >= AI06?

yes

End.

SI B72 04 17Attachment

July 2018

The SI B72 04 17_Attachment supersedes dated February 2018
New information provided by this revision is preceded by this symbol

PASSENGER OCCUPANCY DETECTION ERROR CORRECTION

1. Move the front seat to its highest position.
2. Detach the lower front seat trim.
3. Disconnect the Evaluation Electronics
(CIS) plug connection.

4. Check the plug for conditions resulting in
possible poor electrical connection –
corrosion, bent pins, etc. – removing
control unit if needed, as shown.
5. Repair any connection problems.
6. Securely re-install control unit, if removed.
7. Reconnect plug into CIS.

1

SI B72 04 17Attachment

July 2018

8. Secure the loose clip attached to cables,
as shown.

For cable tie postion review the: https://tinyurl.com/V520218

First cable tie position as shown in abov photo

2

SI B72 04 17Attachment

July 2018

Secound cable tie position as shown in abov photo
9. With the tool showing in the picture tie the
cabel only around the harness.

10. Re-attach seat trim panel.
11. Verify free motion of seat belt and seat adjustment.
12. Verify correct operation of occupant detection system. There should be no fault memory
entries for airbag warnings.
13. Check the POL function

3