Diagnosis System

AIR CONDITIONING SYSTEM:

DIAGNOSIS SYSTEM

1. LIST OF OPERATION METHODS
By operating each of the A/C control switches as shown in the diagram below, it is possible to enter the diagnostic check mode.





2. DESCRIPTION
(a) When troubleshooting a vehicle with the diagnosis system, the only difference from the usual troubleshooting procedure is connecting the Techstream to the vehicle and reading various date output from the vehicle's air conditioning amplifier. The air conditioning amplifier records DTCs when the computer detects a malfunction in the computer itself or in its circuits. To check the DTCs, connect the Techstream to the DLC3 on the vehicle. The Techstream enables you to erase the DTCs, activate the various actuators, and check the freeze frame date and Data List.
3. CHECK THE DLC3






(a) The air conditioning amplifier uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.





NOTE: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.

(b) Connect the cable of the Techstream to the DLC3, turn the ignition switch to the ON position and attempt to use the Techstream. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the Techstream.
- If communication is normal when the Techstream is connected to another vehicle, inspect the DLC3 on the original vehicle.
- If communication is still not possible when the Techstream is connected to another vehicle, the problem may be in the Techstream itself. Consult the Service Department listed in the Techstream's instruction manual.

4. INDICATOR CHECK






(a) Turn the ignition switch to the ON position while pressing the A/C control "AUTO" switch and "R/F" switch simultaneously.





(b) Check that the indicators come on and go off 4 times in succession at 1 second intervals.
- If a navigation system is installed, the indicator will blink and buzzer will sound.
- After the indicator check is completed, the system enters the DTC mode automatically.
- Press the "OFF" switch to cancel the check mode.