Air Conditioning System (for Manual Air Conditioning System)

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

1. CHECK AIR CONDITIONING AMPLIFIER





(a) Measure the voltage and waveform according to the value(s) in the table below.

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









(b) Using an oscilloscope, check waveform 1.





Blower motor control signal





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

(c) Using an oscilloscope, check waveform 2.





CAN communication signal





HINT
The waveform varies depending on the CAN communication signal.

(d) Using an oscilloscope, check waveform 3.





CAN communication signal





HINT
The waveform varies depending on the CAN communication signal.

2. CHECK AIR CONDITIONING CONTROL ASSEMBLY





(a) Measure the voltage according to the value(s) in the table below.





3. CHECK REAR AIR CONDITIONING CONTROL ASSEMBLY





(a) Measure the voltage according to the value(s) in the table below.





4. CHECK HYBRID VEHICLE CONTROL ECU





(a) Measure the voltage and waveform according to the value(s) in the table below.

HINT
Check from the rear of the connector while it is connected to the hybrid vehicle control ECU.





(b) Using an oscilloscope, check waveform.





A/C communication signal





HINT
Waveform cycle varies with the communication contents.