Inspection Procedure

HINT:

When using the intelligent tester, start from *1. When not using the intelligent tester, start from *2.

PERFORM ACTIVE TEST BY INTELLIGENT TESTER*1

Connect the intelligent tester (with CAN VIM) to the DLC3.
Turn the ignition switch ON and push the intelligent tester main switch ON.

Select the item "A/C MAG CLUTCH" in the ACTIVE TEST and read its value displayed on the intelligent tester.

DATA LIST

Item	Measurement Item/Display (Range)	Diagnostic Note
A/C MAG CLUTCH	A/C Magnet Clutch Status/ON or OFF	-

HINT:

Check with the engine running.

NG: Go to step 3

OK: Go to next step

READ VALUE OF INTELLIGENT TESTER

Connect the intelligent tester (with CAN VIM) to the DLC3.
Turn the ignition switch ON and push the intelligent tester main switch ON.

Select the item "A/C SIG" in the DATA LIST and read its value displayed on the intelligent tester.

DATA LIST

Item	Measurement Item/Display (Range)	Normal Condition	Diagnostic Note
A/C SIG	A/C SW Status/ON or OFF	A/C SW Push: ON A/C SW Release: OFF	-

NG: Go to step 9

OK: END

INSPECT MAGNETIC CLUTCH RELAY*2

Disconnect the A4 magnetic clutch connector.
Turn the ignition switch ON.
Push the A/C switch ON.

Measure the voltage of the wire harness side connectors.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
A4 - 3 - Body ground	10 to 14 V

OK: Go to step 9

Fig 1: Identifying Magnetic Clutch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to next step

INSPECT FUSE (A/C)
1. Remove the A/C fuse from the cowl side junction block LH.
2. Measure the resistance of the fuse.
  OK:
  
  Below 1 Ω
NG: REPLACE A/C FUSE

OK: Go to next step

CHECK WIRE HARNESS (BATTERY - MAGNETIC CLUTCH RELAY)

Disconnect the 1B engine room junction block connector.
Turn the ignition switch ON.

Measure the voltage of the wire harness side connectors.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
1B - 16 - Body ground	10 to 14 V

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

Fig 2: Identifying Engine Room Junction Block Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - MAGNETIC CLUTCH RELAY)

Disconnect the 1B engine room junction block connector.
Disconnect the A47 and A49 A/C amplifier connector.
Disconnect the A4 magnetic clutch connector.

Measure the resistance of the wire harness side connectors,

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
A47-7 (MGC) - 1B-8	Below 1 Ω
A47-7 (MGC) - Body ground	10 kΩ or higher
1B-26 - A4-3	Below 1 Ω
1B-26 - Body ground	10 k Ω or higher
A49-12 (GND) - Body ground	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

Fig 3: Checking Wire Harness (Air Conditioning Amplifier - Magnetic Clutch Relay)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

CHECK MAGNETIC CLUTCH RELAY

Disconnect the 1B engine room junction block connector.

Fig 4: Identifying Engine Room Junction Block Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the relay.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
1B-16 - 1B-26	10 kΩ or higher
1B-16 - 1B-26	Below 1 Ω (When battery voltage is applied to terminals 1B-16 and 1B-8.)

NG: REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY

OK: Go to next step

CHECK MAGNETIC CLUTCH ASSEMBLY
1. Disconnect the magnetic clutch connector.
2. Connect the positive (+) lead connected to the battery to the magnetic clutch connector terminal 3 and check the magnetic clutch.
  OK:
  
  Magnetic clutch is energized.
NG: REPLACE MAGNETIC CLUTCH ASSEMBLY

Fig 5: Checking Magnetic Clutch Assembly
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - ECM)

Disconnect the A47 and A49 A/C amplifier connectors.
Disconnect the E9 ECM connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
A47-11 (AC1) - E9-24 (AC1)	Below 1 Ω
A47-11 (AC1) - Body ground	10 k Ω or higher
A49-4 (ACT) - E9-25 (ACT)	Below 1 Ω
A49-4 (ACT) - Body ground	10 k Ω or higher

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

Fig 6: Checking Wire Harness (Air Conditioning Amplifier - ECM)

OK: Go to next step

CHECK AIR CONDITIONING AMPLIFIER

Remove the A/C amplifier with connectors still connected.
Start the engine and push AUTO switch.

Measure the voltage of the A/C amplifier connector and body ground when magnetic clutch is ON and OFF by A/ C switch.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

Switch Condition	Tester Connection	Specified Condition
ON	A49-4 (ACT) - Body ground	10 to 14 V
OFF	A49-4 (ACT) - Body ground	Below 1 V

Fig 7: Identifying A49 Connector Terminals

NG: REPLACE AIR CONDITIONING AMPLIFIER

OK: REPLACE ECM