Air Conditioning System - Diagnosis: Overview Lexus GS II рестайлинг

LIST OF OPERATION METHODS

By operating each of the A/C control switches as shown in the diagram below in (Scheme 129), it is possible to enter the diagnosis check mode.

Scheme 129

Scheme 130

Scheme 131

1. Turn the ignition switch on while pressing the A/C control AUTO switch and R/F SW simultaneously.
2. Check that all the indicators light up and go off at 1 second intervals 4 times in succession. HINT: After the indicator check is ended, the diagnostic trouble code check begins automatically. Press the OFF switch when desiring to cancel the check mode.

Scheme 132

Scheme 133

1. Perform an indicator check. After the indicator check is completed, the system enters the DTC check mode automatically.
2. Read the DTC displayed on the panel. Refer to the list of «DIAGNOSTIC TROUBLE CODE CHART»(ref-208150-S41026605822005120200000) when reading the DTCs (DTCs are out put at the temperature display.). If the slower display is desired, press the Driver Side Temp. Control Switch and change it to step operation. Each time the Driver Side Temp. Control switch is pressed, the display changes. (see «WARNING FOR A/C COMPRESSOR LOCK»(ref-208150-S37116202122005120200000) . HINT: W/ EMV only If the buzzer sounds when a DTC is being read, it means the trouble indicated by that DTC continues to occur. If the buzzer does not sound when a DTC is being read, it means the trouble indicated by that DTC occurred earlier (such as poor connector contacts, etc.).

Scheme 134

1. Hook up the LEXUS hand-held tester to the DLC3.
2. Read the diagnostic trouble codes by following the prompts on the tester screen. Please refer to the «LEXUS HAND-HELD TESTER»(ref-208150-S31878710312005120200000) operator's manual for further details.

Scheme 135

1. Pull out the ECU-B2 fuse in Passenger Side J/B for 10 sec. or longer to clear diagnostic the DTC's memory.
2. After reinserting the fuse, check that the normal code is output.

Scheme 136

Scheme 137

Scheme 138

1. After entering the sensor check mode, press the R/F switch.
2. Since each damper, motor and relay automatically operates at 1 second intervals beginning in order from 20 in the temperature display, check the temperature and air flow visually and by hand. If a slower display is desired, press the A/C switch and change it to step operation. Each time the A/C switch is pressed, the display changes. (see «WARNING FOR A/C COMPRESSOR LOCK»(ref-208150-S37116202122005120200000) ). HINT: The buzzer sounds when the display trouble code changes. Code are displayed in order from the smaller to the larger numbers. To cancel the check mode, press the Off switch.