Air Conditioning System (for Automatic Air Conditioning System)

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

1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY





(a) Disconnect the F42 amplifier connector.

(b) Measure the voltage and resistance according to the value(s) in the table below.





* If the result is not as specified, there may be a malfunction on the wire harness side.

(c) Reconnect the F42 amplifier connector.

(d) Measure the voltage and resistance according to the value(s) in the table below.









* *1: w/ PTC Heater

HINT
*2: After the measurement conditions are met, wait 30 seconds before performing measurements.

* If the result is not as specified, the air conditioning amplifier assembly may have a malfunction.

(e) Using an oscilloscope, check waveform 1.









(f) Using an oscilloscope, check waveform 2.









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

2. CHECK HEATER CONTROL ASSEMBLY





(a) Disconnect the F29 control connector.

(b) Measure the resistance and voltage according to the value(s) in the table below.





(c) If the result is not as specified, there may be a malfunction on the wire harness side.

3. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)





(a) Remove the main body ECU Removal.

(b) Measure the voltage and resistance according to the value(s) in the table below.





(c) If the result is not as specified, there may be a malfunction in the wire harness.

(d) Install the main body ECU Installation.

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





* If the result is not as specified, the main body ECU or driver side junction block assembly may have a malfunction.