Inspection Procedure

1. Remove the air conditioning amplifier with its connectors still connected.
2. Check the waveform of the amplifier connector.

   OK : 

   Waveform is as shown in the illustration.  (See Fig 1)

   ITEM AND CONTENT REFERENCE
   
   

   Item	Content
   Tester Connection	LOCK (E37-8) - SG-2 (E37-13)
   Tool Setting	500 mV/DIV., 20 msec./DIV.
   Condition	Ignition switch ON AUTO switch ON A/C switch ON Magnetic clutch ON

   Fig 1: Waveform Graph

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   NG	A
   OK (Checking from the PROBLEM SYMPTOMS TABLE)	B
   OK (Checking from 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 B47 compressor lock sensor connector.
2. Measure the resistance of the sensor.
   Fig 2: Measuring Resistance Of Compressor Lock Sensor

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance 

   TERMINALS RESISTANCE SPECIFICATION (CONNECTOR(S) DISCONNECTED)
   
   

   Tester Connection	Condition	Specified Condition
   1 (SSR+) - 2 (SSR-)	20°C (68°F)	65 to 125

NG: REPLACE COMPRESSOR LOCK SENSOR 

OK: GO TO NEXT STEP. 

1. Disconnect the B47 compressor lock sensor connector.
2. Disconnect the E37 amplifier connector.
   Fig 3: Disconnecting B47 & E37 Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   TERMINALS RESISTANCE SPECIFICATION (CONNECTOR(S) DISCONNECTED)
   
   

   Tester Connection	Specified Condition
   B47-1 (SSR+) - E37-8 (LOCK)	Below 1
   B47-2 (SSR-) - E37-13 (SG-2)	Below 1
   B47-1 (SSR+) - E37-13 (SG-2)	10 k or higher
   E37-8 (LOCK) - Body ground	10 k or higher

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: REPLACE AIR CONDITIONING AMPLIFIER