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)QUICK LOOKUPSELECTRICAL COMPONENT LOCATIONSCOMPONENT LOCATIONS: CONTROL MODULES IN MIDDLE PART OF VEHICLECOMPONENT LOCATIONS: CONTROL MODULES IN MIDDLE PART OF VEHICLEDATA BUS ON BOARD DIAGNOSTIC INTERFACE -J533- COMPONENT LOCATION AND CONNECTOR END VIEWDATA BUS ON BOARD DIAGNOSTIC INTERFACE -J533-, WITHOUT EMERGENCY CALL FUNCTION (IW0), THROUGH JUNE 2019PIN ARRANGEMENTS DATA BUS ON BOARD DIAGNOSTIC INTERFACE -J533
2025 Audi A4 allroad Premium Plus
Pin Arrangements Data Bus On Board Diagnostic Interface -J533
2025 Audi A4 allroad Premium PlusSECTION Pin Arrangements Data Bus On Board Diagnostic Interface -J533
| -T54- (A) | Designation | -T54- (A) | Designation | -T54- (A) | Designation | ||
|---|---|---|---|---|---|---|---|
| 1 | 19 | 37 | |||||
| 2 | 20 | 38 | |||||
| 3 | Diagnostic connection -U31- / FlexRay-Bus | 21 | Diagnostic connection -U31- / FlexRay-Bus | 39 | |||
| 4 | Diagnostic connection -U31- | 22 | Diagnostic connection -U31- | 40 | |||
| 5 | All-Wheel Drive Control Module -J492- / FlexRay-Bus | 23 | All-Wheel Drive Control Module -J492- / FlexRay-Bus | 41 | All-Wheel Drive Control Module -J492- | ||
| 6 | 24 | 42 | All-Wheel Drive Control Module -J492- | ||||
| 7 | Distance Regulation Control Module 2 -J850- / FlexRay-Bus | 25 | Distance Regulation Control Module 2 -J850- / FlexRay-Bus | 43 | |||
| 8 | Airbag Control Module -J234- / FlexRay-Bus | 26 | Airbag Control Module -J234- / FlexRay-Bus | 44 | |||
| 9 | FlexRay-Bus/automatic transmission | 27 | FlexRay-Bus/automatic transmission | 45 | FlexRay-Bus for driver assistance systems, level control system | ||
| 10 | Engine Control Module (ECM) -J623- / FlexRay-Bus | 28 | Engine Control Module (ECM) -J623- / FlexRay-Bus | 46 | FlexRay-Bus for driver assistance systems, level control system | ||
| 11 | B229 |
29 | B230 |
47 | |||
| 12 | Extended System CAN-Bus High | 30 | Extended System CAN-Bus Low | 48 | CAN-Bus diagnostic Low | ||
| 13 | CAN-Bus Infotainment, High | 31 | CAN-Bus Infotainment, Low | 49 | CAN-Bus diagnostic High | ||
| 14 | 32 | 50 | Front A/C display control head -E87- / CAN-Bus Low | ||||
| 15 | Comfort System CAN-Bus High | 33 | Comfort System CAN-Bus Low | 51 | Front A/C display control head -E87- / CAN-Bus High | ||
| 16 | LIN-Bus | 34 | LIN-Bus | 52 | |||
| 17 | Terminal 15 | 35 | 53 | ||||
| 18 | Terminal 30 | 36 | Diagnostic connection -U31- | 54 | Terminal 31 |
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.