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: 2GR-FE

*4: 1AR-FE

(b) Using an oscilloscope, check waveform 1.

Compressor operation signal

Blower motor control signal

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

(d) Using an oscilloscope, check waveform 3.

CAN communication signal

HINT
The waveform varies depending on the CAN communication signal.

(e) Using an oscilloscope, check waveform 4.

CAN communication signal

HINT
The waveform varies depending on the CAN communication signal.

(f) Using an oscilloscope, check waveform 5.

Air Conditioning compressor lock sensor signal

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.