Connector Assignments

Digital Sound System Control Module J525 

Fig 1: Digital Sound System Control Module -J525-

Courtesy of AUDI OF AMERICA, LLC

1. 38-Pin Connector -T38-
2. MOST Bus

1 - 38-Pin Connector T38 

Courtesy of AUDI OF AMERICA, LLC

1. Terminal 30
2. Terminal 31
3. Not Assigned
4. Left Rear Bass Speaker -R15- (+)
5. Left Rear Bass Speaker -R15- (-)
6. Center Speaker -R208- (-)
7. Left Front Bass Speaker -R21- (-)
8. Left Front Bass Speaker -R21- (+)
9. Right Front Bass Speaker -R23- (+)
10. Right Front Bass Speaker -R23- (-)
11. Left Front Midrange Speaker -R103- (-)
12. Left Front Midrange Speaker -R103- (+)
13. Right Front Midrange Speaker -R104- (-)
14. Right Front Midrange Speaker -R104- (+)
15. Not Assigned
16. Right Rear Bass Speaker -R17- (-)
17. Right Rear Bass Speaker -R17- (+)
18. Center Speaker -R208- (+)
19. Subwoofer -R211- (-)
20. Subwoofer -R211- (+)
21. Subwoofer -R211- (+)
22. Subwoofer -R211- (-)
23. Right Front Treble Speaker -R22- (-)
24. Left Front Treble Speaker -R20- (-)
25. Left Rear Treble Speaker -R14- (+)
26. Right Rear Treble Speaker -R16- (-)
27. Right Effects Speaker -R210- (-)
28. Left Effects Speaker -R209- (-)
29. Microphone input (-) from Microphone Unit In Front Roof Module -R164-, Interior Microphone -R74-
30. Not Assigned
31. Right Front Treble Speaker -R22- (+)
32. Left Front Treble Speaker -R20- (+)
33. Left Rear Treble Speaker -R14- (-)
34. Right Rear Treble Speaker -R16- (-)
35. Right Effects Speaker -R210- (+)
36. Left Effects Speaker -R209- (+)
37. Microphone input (+) from Microphone Unit In Front Roof Module -R164-, Interior Microphone -R74-
38. Ring break diagnostic line

2 - MOST bus 

Fig 2: 2 - MOST Bus

Courtesy of AUDI OF AMERICA, LLC

1. Input
2. Output