Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

PERFORM ACTIVE TEST BY TECHSTREAM

Connect Techstream to the DLC3.
Turn the ignition switch ON and turn Techstream ON.

Select the item below in the Active Test and then check that the compressor magnetic relay operates.

Air conditioning amplifier

DATA LIST - AIR CONDITIONING AMPLIFIER

Item	Test Details / Display (Range)	Diagnostic Note
Magnetic Clutch Relay	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 Ω
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.

Fig 1: Identifying Magnetic Clutch Relay
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the relay.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
3 - 5	10 kΩ or higher
3 - 5	Below 1 Ω (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: Identifying E37 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage of the wire harness side connector.

Standard voltage

VOLTAGE SPECIFICATION

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 E37 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage of the connector.

Standard voltage

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 Magnetic Clutch Connector
  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)