Air Conditioning System (for Automatic Air Conditioning System)

AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): TERMINALS OF ECU

1. CHECK AIR CONDITIONING AMPLIFIER





(a) Measure the voltage of the connectors.

HINT
Check from the rear of the connector while it is connected to the air conditioning amplifier.













HINT
*1: w/ PTC Heater

*2: for Rear Air Conditioning

*3: for Rear Automatic Air Conditioning

*4: for TMC Made

*5: for TMMI Made

(b) Using an oscilloscope, check waveform 1.









(c) Using an oscilloscope, check waveform 2.









HINT
When the blower level is increased, the duty ratio changes accordingly.

(d) Using an oscilloscope, check waveform 3.









HINT
The waveform varies depending on the CAN communication signal.

(e) Using an oscilloscope, check waveform 4.









HINT
The waveform varies depending on the CAN communication signal.

(f) Using an oscilloscope, check waveform 5.









HINT
The waveform varies depending on the engine speed.

2. CHECK FRONT AIR CONDITIONING CONTROL





(a) Measure the voltage of the connectors.





3. CHECK REAR AIR CONDITIONING CONTROL (for Rear Air Conditioning)





(a) Measure the voltage of the connectors.