Toyota RAV4 Service Manual: Compressor circuit

Description

When the a/c switch is turned on, the magnetic clutch on signal is sent from the air conditioning amplifier. Then the mg clt relay turns on to operate the magnetic clutch.

Wiring diagram

Inspection procedure

1. Perform active test by intelligent tester (a/c mag clutch)

1. Connect the intelligent tester (with can vim) to the dlc3.
2. Turn the ignition switch on and turn the intelligent tester main switch on.
3. Select the item below in the active test and then check that the compressor magnetic relay operates.

2. 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

3. Inspect magnetic clutch relay (marking: mg clt)

1. Remove the magnetic clutch relay from the engine room no. 1 Relay block.
2. Measure the resistance of the relay.

Standard resistance

4. Check wire harness (air conditioning amplifier - battery)

1. Disconnect the e37 amplifier connector.
2. Measure the voltage of the wire harness side connector.

Standard voltage

5. Check air conditioning amplifier (mgc voltage)

1. Remove the air conditioning amplifier with its connectors still connected.
2. Measure the voltage of the connector.

Standard voltage

6. Check magnetic clutch

1. Disconnect the b47 magnetic clutch connector.
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.

Repair or replace wire harness (magnetic clutch - ecu-ig1)