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 DIAGNOSISELECTRICALCOMPONENT LOCATIONSCOMPONENT LOCATIONS: CONTROL MODULES IN MIDDLE PART OF VEHICLECOMPONENT LOCATIONS: CONTROL MODULES IN MIDDLE PART OF VEHICLEMEMORY SEAT/STEERING COLUMN ADJUSTMENT CONTROL MODULE -J136- / PASSENGER MEMORY SEAT CONTROL MODULE -J521- COMPONENT LOCATION AND CONNECTOR END VIEWPIN ARRANGEMENTS PASSENGER MEMORY SEAT CONTROL MODULE -J521
2025 Audi A4 allroad Premium Plus
Pin Arrangements Passenger Memory Seat Control Module -J521
2025 Audi A4 allroad Premium PlusSECTION Pin Arrangements Passenger Memory Seat Control Module -J521
| -T20b- (A) | Designation | -T20b- (A) | Designation | |
|---|---|---|---|---|
| 1 | Comfort System CAN-Bus High | 11 | Comfort System CAN-Bus Low | |
| 2 | 12 | |||
| 3 | Coding line | 13 | ||
| 4 | 14 | Front Passenger's Seat Adjustment Control Head -E471- | ||
| 5 | 15 | Front Passenger's Seat Adjustment Control Head -E471- | ||
| 6 | 16 | Front Passenger's Seat Adjustment Control Head -E471- | ||
| 7 | 17 | Front Passenger's Seat Adjustment Control Head -E471- | ||
| 8 | Front Passenger's Seat Adjustment Control Head -E471- | 18 | ||
| 9 | 19 | Front Passenger's Seat Adjustment Control Head -E471- | ||
| 10 | 20 | Coding line |
| -T4ab- (C) | Designation | -T26c- (D) | Designation | -T26a- (E) | Designation | ||
|---|---|---|---|---|---|---|---|
| 1 | Terminal 30 | 1 | Front Passenger's Backrest Adjustment Motor -V46- | 1 | |||
| 2 | 2 | 2 | |||||
| 3 | Terminal 31 | 3 | 3 | Front Passenger's Seat Fore/Aft Adjustment Motor -V31- | |||
| 4 | 4 | 4 | |||||
| 5 | 5 | Front Passenger's Seat Fore/Aft Adjustment Motor -V31- | |||||
| 6 | 6 | ||||||
| 7 | 7 | Front Passenger's Seat Inclination Adjustment Motor -V244- | |||||
| 8 | 8 | Front Passenger's Seat Fore/Aft Adjustment Motor -V31- | |||||
| 9 | 9 | ||||||
| 10 | 10 | Front Passenger's Seat Height Adjustment Motor -V246- | |||||
| 11 | 11 | ||||||
| 12 | 12 | ||||||
| 13 | 13 | ||||||
| 14 | 14 | ||||||
| 15 | 15 | ||||||
| 16 | 16 | ||||||
| 17 | 17 | ||||||
| 18 | 18 | ||||||
| 19 | Front Passenger's Backrest Adjustment Motor -V46- | 19 | |||||
| 20 | 20 | ||||||
| 21 | 21 | ||||||
| 22 | 22 | ||||||
| 23 | 23 | Front Passenger's Seat Inclination Adjustment Motor -V244- | |||||
| 24 | 24 | Front Passenger's Seat Fore/Aft Adjustment Motor -V31- | |||||
| 25 | 25 | Front Passenger's Seat Height Adjustment Motor -V246- | |||||
| 26 | 26 |
RENDER: 1.0x
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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.