Inspection Procedure

WARNING: This page is about a different car, the 2007 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (A/C MAG CLUTCH)

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

Select the item below in the ACTIVE TEST and then check that the compressor magnetic relay operates.

Air conditioning amplifier

ACTIVE TEST DETAIL

Item	Test Details / Display (Range)	Diagnostic Note
A/C MAG CLUTCH	Magnetic clutch relay / OFF, ON	Operating sound can be heard

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

NG: GO TO NEXT STEP.

INSPECT FUSE (ECU-IG1)
1. Remove the ECU-IG1 fuse from the instrument panel junction block.
2. Measure the resistance of the fuse.
  Standard resistance:
  
  Below 1
NG: REPLACE FUSE

OK: GO TO NEXT STEP.

INSPECT MAGNETIC CLUTCH RELAY (Marking: MG CLT)

Remove the magnetic clutch relay from the engine room No. 1 relay block.

Measure the resistance of the relay.

Fig 1: Inspecting Magnetic Clutch Relay Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance

TERMINALS RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
3 - 5	10 k or higher
3 - 5	Below 1 (when battery voltage is applied to terminals 1 and 2)

NG: REPLACE MAGNETIC CLUTCH RELAY

OK: GO TO NEXT STEP.

CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - BATTERY)

Disconnect the E37 amplifier connector.

Fig 2: Disconnecting E37 Amplifier Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage of the wire harness side connector.

Standard voltage

TERMINALS VOLTAGE SPECIFICATION (CONNECTOR(S) DISCONNECTED)

Tester Connection	Condition	Specified Condition
E37-20 (MGC) - Body ground	Ignition switch ON	10 to 14 V
E37-20 (MGC) - Body ground	Ignition switch OFF	Below 1 V

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: GO TO NEXT STEP.

CHECK AIR CONDITIONING AMPLIFIER (MGC VOLTAGE)

Remove the air conditioning amplifier with its connectors still connected.

Fig 3: Identifying Air Conditioning Amplifier
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage of the connector.

Standard voltage

TERMINALS VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
E37-20 (MGC) - Body ground	Ignition switch ON A/C switch OFF	10 to 14 V
E37-20 (MGC) - Body ground	Ignition switch ON A/C switch ON	Below 1.5 V

NG: REPLACE AIR CONDITIONING AMPLIFIER

OK: GO TO NEXT STEP.

CHECK MAGNETIC CLUTCH
1. Disconnect the B47 magnetic clutch connector.
  
  Fig 4: Identifying B47 Magnetic Clutch Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the battery's positive (+) lead to terminal 3 of the magnetic clutch and the negative (-) lead to the body ground.
  OK :
  
  Magnetic clutch is engaged.
NG: REPLACE MAGNETIC CLUTCH

OK: REPAIR OR REPLACE WIRE HARNESS (MAGNETIC CLUTCH - ECU-IG1)