A/C Signal Circuit Troubleshooting
NOTE:
  • If the blower motor does not run at all speeds, the A/C compressor will be inoperative. Run the self-diagnostic function, and check the DTC B1241. Before performing any other troubleshooting, repair the cause of the inoperative blower motor.
  • Do not use this troubleshooting procedure if any of the following items are operative; condenser fan, radiator fan, A/C compressor, or if the heater is inoperative. Refer to the symptom troubleshooting index.
  • Before doing symptom troubleshooting, check for powertrain DTCs, R20A3 engine model, K24Z3 engine model. Also check for B-CAN codes.
  1. Turn the ignition switch to ON (II).
  1. Check if the blower motor operates at all speeds.
Does the blower motor operate at all speeds?
YES -
Go to Step 3 .
NO -
Repair the problem in the blower motor circuit.■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect climate control unit connector A (28P).
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between climate control unit connector A (28P) No. 21 terminal and body ground.
Is there battery voltage?
YES -
Go to Step 7 .
NO -
Go to Step 8 .