B10A9
From Ross-Tech Wiki
B10A9 - Control Circuit for A/C Compressor
B10A911 - Control Circuit A/C Compressor: Short to Ground
Possible Symptoms
- Climate Control not working (Not cooling)
Possible Causes
- Fuse(s) faulty
- Wiring and/or Connector(s) from/to Compressor Regulating Valve (N280) faulty
- Compressor Regulating Valve (N280) faulty
- Heating/Climate Control Module (J301) faulty
Possible Solutions
- Check Fuse(s)
- Check Wiring and/or Connector(s) from/to Compressor Regulating Valve (N280)
- Check/Replace Compressor Regulating Valve (N280)
- Check Measuring Value Blocks (MVB)
- Perform Output Test
- Check/Replace Heating/Climate Control Module (J301)
B10A915 - Control Circuit A/C Compressor: Open or Short to Plus
Possible Symptoms
- Climate Control not working (Not cooling)
Possible Causes
- Fuse(s) faulty
- Wiring and/or Connector(s) from/to Compressor Regulating Valve (N280) faulty
- The wrong 2-wire electrical connector is plugged into the Regulating Valve (N280)
- Compressor Regulating Valve (N280) faulty
- Heating/Climate Control Module (J301) faulty
Possible Solutions
- Check Fuse(s)
- Check Wiring and/or Connector(s) from/to Compressor Regulating Valve (N280)
- Verify the color of the wires matches the ones shown in the wiring diagram for N280 as per this thread
- Check/Replace Compressor Regulating Valve (N280)
- Check Measuring Value Blocks (MVB)
- Perform Output Test
- Check/Replace Heating/Climate Control Module (J301)
Special Notes
- The Refrigerant Compressor may need to be replaced if the Compressor Regulating Valve (N280) is not available separately.
- When found in the (4H) Audi A8 chassis 08-Auto HVAC control module, check the N280 AC compressor wiring to/from J519 per the factory level Wiring Diagram.
