A L L Diagnostic Trouble Codes ( DTC ): Manufacturer Code Charts
A and Auto
DTC Troubleshooting: B1225 (A and AUTO)
DTC B1225 or DTC indicator A and AUTO:
An Open in the In-Car Temperature Sensor Circuit
1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Do the self-diagnostic function with the HDS or the climate control unit.
4. Check for DTCs.
Is DTC B1225 or A and AUTO indicated?
YES -
Go to step 5.
NO -
Intermittent failure, check for loose wires or poor connections in the in-car temperature sensor circuit.?
5. Turn the ignition switch to LOCK (0).
6. Remove the humidity/in-car temperature sensor See: Heating and Air Conditioning/Cabin Temperature Sensor / Switch/Service and Repair,
and test it.
Is the in-car temperature sensor OK?
YES -
With the humidity/in-car temperature sensor disconnected, go to step 7.
NO -
Replace the humidity/in-car temperature sensor See: Heating and Air Conditioning/Cabin Temperature Sensor / Switch/Service and Repair.?
7. Disconnect climate control unit connector A (40P).
8. Check for continuity between climate control unit connector A (40P) terminal No. 5 and humidity/in-car temperature sensor 4P connector
