Toyota RAV4 (XA40) 2013-2018 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
- 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.


- Inspect fuse (ecu-ig1)
- Remove the ecu-ig1 fuse from the instrument panel
junction block.
- Measure the resistance of the fuse.
Standard resistance:
below 1 

- 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.
Standard resistance


- Check wire harness (air conditioning amplifier - battery)

- Disconnect the e37 amplifier connector.
- Measure the voltage of the wire harness side connector.
Standard voltage


- Check air conditioning amplifier (mgc voltage)

- Remove the air conditioning amplifier with its connectors
still connected.
- Measure the voltage of the connector.
Standard voltage


- Check magnetic clutch

- Disconnect the b47 magnetic clutch connector.
- 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)
Description
The blower motor is operated by signals from the air conditioning amplifier.
Blower motor speed signals
are transmitted in accordance with changes in the duty ratio.
Wiring diagra ...
Description
This is the main power source supplied to the air conditioning amplifier when
the ignition switch is on
(ig). This power source is used for operating components, such as the air
cond ...
Other materials:
Compressor lock sensor circuit
Description
This sensor sends 1 pulse per engine revolution to the air conditioning
amplifier. If the ratio of the
compressor speed divided by the engine speed is smaller than a predetermined
value, the air conditioning
amplifier turns the compressor off, and the indicator blinks at appro ...
Assist grips
An assist grip installed on the ceiling
can be used to support your
body while sitting on the seat.
Caution
Assist grip
Do not use the assist grip when getting in or out of the vehicle or
rising from
your seat.
Doing so could damage the assist grip, or could cause you to injure yourse ...
Using the aux port
To use the aux port, connect a portable player, press the
“audio” button, then select “aux” to display the audio control
screen.
Connecting a portable audio player
Operating portable audio players connected to the audio system
The volume can be adjusted using the vehicle’s audio contr ...