Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI2025A4 ALLROAD PREMIUM PLUSREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALCOMPONENT LOCATIONSCOMPONENT LOCATIONS: CONTROL MODULES IN REAR PART OF VEHICLECOMPONENT LOCATIONS: CONTROL MODULES IN REAR PART OF VEHICLEDIGITAL SOUND SYSTEM CONTROL MODULE -J525-, PREMIUM-SOUND COMPONENT LOCATION AND CONNECTOR END VIEWPIN ARRANGEMENTS DIGITAL SOUND SYSTEM CONTROL MODULE -J525-, FROM JULY 2019
2025 Audi A4 allroad Premium Plus
Pin Arrangements Digital Sound System Control Module -J525-, from July 2019
2025 Audi A4 allroad Premium PlusSECTION Pin Arrangements Digital Sound System Control Module -J525-, from July 2019
| -T38a- (A) | Designation | -T38a- (A) | Designation | -T38a- (A) | Designation | ||
|---|---|---|---|---|---|---|---|
| 1 | VS | 14 | 27 | ||||
| 2 | GND | 15 | SIG-, Right Front Treble Speaker 2 -R221- | 28 | |||
| 3 | SIG+, Right Front Treble Speaker 2 -R221- | 16 | SIG-, Left Front Treble Speaker 2 -R220- | 29 | DATA, Control module for emergency call module and communication unit -J949- | ||
| 4 | SIG+, Left Front Treble Speaker 2 -R220- | 17 | SIG-, Right Rear Treble Speaker -R16-, Right Rear Bass Speaker -R17- | 30 | DATA, Control module for emergency call module and communication unit -J949- | ||
| 5 | SIG+, Right Rear Treble Speaker -R16-, Right Rear Bass Speaker -R17- | 18 | SIG-, Left Rear Treble Speaker -R14-, Left Rear Bass Speaker -R15- | 31 | |||
| 6 | SIG+, Left Rear Treble Speaker -R14-, Left Rear Bass Speaker -R15- | 19 | Subwoofer -R211- | 32 | |||
| 7 | Subwoofer -R211- | 20 | Subwoofer -R211- | 33 | |||
| 8 | Subwoofer -R211- | 21 | SIG-, Right Front Bass Speaker -R23- | 34 | |||
| 9 | SIG+, Right Front Bass Speaker -R23- | 22 | SIG-, Left Front Bass Speaker -R21- | 35 | |||
| 10 | SIG+, Left Front Bass Speaker -R21- | 23 | 36 | ||||
| 11 | 24 | 37 | DATA, Control Module for Information Electronics 1 -J794- | ||||
| 12 | 25 | 38 | DATA, Control Module for Information Electronics 1 -J794- | ||||
| 13 | 26 |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.