Inspection Procedure

1. Use the intelligent tester to check if the CAN Communication System is functioning normally.

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   CAN DTC is not output	A
   CAN DTC is output	B

B:  GO TO CAN COMMUNICATION SYSTEM (See HOW TO PROCEED WITH TROUBLESHOOTING )

A: Go to Next Step 

1. Remove the A/C amplifier with the connectors still connected.
   Fig 1: Identifying A/C Amplifier With Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the waveform of the connector.
   WAVEFORM OF CONNECTOR
   
   

   Item	Contents
   Tool setting	200 mV/DIV., 10ms./DIV.
   Vehicle condition	Engine is running A/C switch: ON Blower switch: LO

   Fig 2: Identifying Signal Waveform Graph

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard 

   AIR CONDITIONING AMPLIFIER
   
   

   Tester Connection (Symbols)	Condition	Specified Condition
   E1-8 (LOCK) - E1-13 (SG-2)	Engine is running A/C switch: ON Blower switch: LO	Pulse generation

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   NG	A
   OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)	B
   OK (When troubleshooting according to the DTC)	C

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

C: REPLACE AIR CONDITIONING AMPLIFIER 

A: Go to Next Step 

1. Disconnect the connector from the A/C compressor.
2. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   COMPRESSOR AND MAGNETIC CLUTCH (A/C LOCK SENSOR)
   
   

   Tester Connection	Condition	Specified Condition
   B2-1 (SSR+) - B2-2 (SSR-)	Always (at 20°C (68°F))	165 to 205 Ω

Fig 3: Identifying A/C Compressor Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE COMPRESSOR AND MAGNETIC CLUTCH (A/C LOCK SENSOR) 

OK: Go to Next Step 

1. Disconnect the connector from the A/C amplifier.
   Fig 4: Identifying A/C Amplifier Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   A/C AMPLIFIER - A/C LOCK SENSOR
   
   

   Tester Connection (Symbols)	Condition	Specified Condition
   E1-8 (LOCK) - B2-1 (SSR+)	Always	Below 1 Ω
   E1-13 (SG-2) - B2-2 (SSR-)	Always	Below 1 Ω
   E1-8 (LOCK) - Body ground	Always	10 kΩ or higher
   E1-13 (SG-2) - Body ground	Always	10 kΩ or higher

Fig 5: Identifying Compressor And Magnetic Clutch Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE AIR CONDITIONING AMPLIFIER