Connector Assignments

WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2020 Audi S3, 2020 Audi RS 3, 2020 Audi A3 Quattro, 2020 Audi A3, and 2019 Audi S3. However, it is still accessible from the selected car via links, so may be relevant.

Digital Sound System Control Module J525

Fig 1: Digital Sound System Control Module -J525-

Courtesy of AUDI OF AMERICA, LLC

38-Pin Connector -T38-
MOST Bus

1 - 38-Pin Connector T38

Courtesy of AUDI OF AMERICA, LLC

Terminal 30
Terminal 31
Not Assigned
Left Rear Bass Speaker -R15- (+)
Left Rear Bass Speaker -R15- (-)
Center Speaker -R208- (-)
Left Front Bass Speaker -R21- (-)
Left Front Bass Speaker -R21- (+)
Right Front Bass Speaker -R23- (+)
Right Front Bass Speaker -R23- (-)
Left Front Midrange Speaker -R103- (-)
Left Front Midrange Speaker -R103- (+)
Right Front Midrange Speaker -R104- (-)
Right Front Midrange Speaker -R104- (+)
Not Assigned
Right Rear Bass Speaker -R17- (-)
Right Rear Bass Speaker -R17- (+)
Center Speaker -R208- (+)
Subwoofer -R211- (-)
Subwoofer -R211- (+)
Subwoofer -R211- (+)
Subwoofer -R211- (-)
Right Front Treble Speaker -R22- (-)
Left Front Treble Speaker -R20- (-)
Left Rear Treble Speaker -R14- (+)
Right Rear Treble Speaker -R16- (-)
Right Effects Speaker -R210- (-)
Left Effects Speaker -R209- (-)
Microphone input (-) from Microphone Unit In Front Roof Module -R164-, Interior Microphone -R74-
Not Assigned
Right Front Treble Speaker -R22- (+)
Left Front Treble Speaker -R20- (+)
Left Rear Treble Speaker -R14- (-)
Right Rear Treble Speaker -R16- (-)
Right Effects Speaker -R210- (+)
Left Effects Speaker -R209- (+)
Microphone input (+) from Microphone Unit In Front Roof Module -R164-, Interior Microphone -R74-
Ring break diagnostic line

2 - MOST bus

Fig 2: 2 - MOST Bus

Courtesy of AUDI OF AMERICA, LLC

Input
Output