2012 Audi A8 BaseFACTORY OEM SERVICE PROCEDURE

Instrument Cluster Multi-Pin Connector Contact Assignment

Gray 32-pin connector -A-

Fig 1: Identifying MOST Bus Connection
GWWA90-10145Courtesy of AUDI OF AMERICA, LLC
  1. Diagnostics for Data Bus On Board Diagnostic Interface -J533-
  2. CAN Bus Shield
  3. CAN Bus Instrument Cluster High
  4. CAN Bus instrument cluster Low
  5. Sensor Ground for All Fuel Level Sensors
  6. Fuel Level Sensor -G-
  7. Fuel Level Sensor -G-
  8. Instrument Cluster Operation Button -E493-
  9. Fuel Level Sensor 2 -G169-
  10. Fuel Level Sensor 2 -G169-
  11. Fuel Level Sensor 3 -G237-
  12. Fuel Level Sensor 3 -G237-
  13. Not Assigned
  14. Not Assigned
  15. Not Assigned
  16. Not Assigned
  17. Analog Clock -Y-
  18. Video Shield - Preparation Work
  19. Night Vision System Control Module -J853- "-"
  20. Night Vision System Control Module -J853- "+"
  21. Video Shield - Preparation Work
  22. Not Assigned
  23. Radio Frequency Controlled Clock 5 V - Preparation Work
  24. Radio Frequency Controlled Clock Signal - Preparation Work
  25. Not Assigned
  26. Not Assigned
  27. Not Assigned
  28. Not Assigned
  29. Terminal 31
  30. Terminal 31
  31. Terminal 30
  32. Terminal 30

Optical MOST-Bus connection (fiber optic) -B-

Fig 2: Identifying MOST Bus Connection
GWWA90-10145Courtesy of AUDI OF AMERICA, LLC
  1. MOST bus input
  2. MOST bus output
Factory Service Tools

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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.

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