A/C Signal Circuit Troubleshooting
NOTE:
  • Use this troubleshooting procedure if the A/C compressor, the A/C condenser fan, and the radiator fan are inoperative.
  • Before doing any symptom troubleshooting, check for powertrain DTCs.
  1. Connect the HDS to the DLC.
  1. Start the engine.
  1. Turn on the A/C on the climate control unit.
  1. Check the A/C SWITCH in the PGM-FI Data List with the HDS.
Is the A/C SWITCH on?
YES -
The A/C signal is OK at this time.■
NO -
Go to Step 5 .
  1. Turn the ignition switch OFF.
  1. Disconnect the climate control unit 32P connector.
  1. Measure the evaporator temperature sensor resistance between the climate control unit 32P connector terminals No. 23 and No. 24.
Is the resistance less than 24 kΩ?
YES -
Go to Step 8 .
NO -
Test the evaporator temperature sensor. ■
  1. Reconnect the climate control unit 32P connector.
  1. Turn the ignition switch ON (II).
  1. Check the blower motor operates at all speeds.
Does the blower motor operate at all speeds?
YES -
Go to Step 11 .
NO -
Repair the problem in the blower motor circuit.■
  1. Turn the ignition switch OFF.
  1. Disconnect the climate control unit 32P connector.
  1. Turn the ignition switch ON (II).