Inspection Procedure

1. Use the intelligent tester to check if the Multiplex Communication System (MPX) is functioning normally.

   Result 

   RESULT REFERENCE
   
   

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

B:  GO TO MULTIPLEX COMMUNICATION SYSTEM

A: Go to Next Step 

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

   Result 

   RESULT REFERENCE
   
   

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

B:  GO TO CAN COMMUNICATION SYSTEM

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 REFERENCE
   
   

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

   Fig 2: Identifying Waveform

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   Standard 

   STANDARD CHART
   
   

   Tester connection (Symbols)	Condition	Specified condition
   A8-13 (SSR+) - A8-15 (SSRL)	Ignition switch: ON A/C switch: ON Blower switch: ON	Pulse generation

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   NG	A
   OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)	B
   OK (When troubleshooting according to the DTCs)	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 compressor and magnetic clutch.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   RESISTANCE REFERENCE CHART
   
   

   Tester connection (Symbols)	Condition	Specified condition
   A2-2 (SSR+) - A2-5 (SSR-)	Always (at 20°C (68°F))	165 to 205 Ω

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

Fig 3: Identifying Connector To Compressor And Magnetic Clutch

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OK: Go to Next Step 

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

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

   Standard resistance 

   RESISTANCE REFERENCE CHART
   
   

   Tester connection (Symbols)	Condition	Specified condition
   A8-13 (SSR+) - A2-2 (SSR+)	Always	Below 1 Ω
   A8-15 (SSRL) - A2-5 (SSR-)	Always	Below 1 Ω
   A8-13 (SSR+) - Body ground	Always	10 kΩ or higher
   A8-15 (SSRL) -Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 5: Identifying A2 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE AIR CONDITIONING AMPLIFIER