Toyota RAV4 (XA40) 2013-2018 Service Manual: Blower motor circuit
Description
When the heater control (blower switch) is set to position 1 or higher, the contact of the htr relay is closed, current flows to the blower motor, and the blower motor operates. The blower motor speed can be changed by exchanging the ground and the blower resistor circuit with the heater control (blower switch).
Wiring diagram
Inspection procedure
- Inspect fuse (htr)
- Remove the htr fuse from the engine room no. 2 Relay block.
- Measure the resistance of the fuse.
Standard resistance:
below 1
- Inspect heater relay (marking: htr)
- Remove the heater relay from the instrument panel junction block.
- Measure the resistance of the relay.
Standard resistance 
- Inspect blower motor
- Disconnect the e54 motor connector.
- Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1, then check that the blower motor operates smoothly.
Ok: the blower motor operates smoothly.
- Measure the current.
Standard current 
- Check wire harness (heater control (blower switch) - battery)
- Disconnect the e24 heater control connector.
- Measure the voltage of the wire harness side connector.
Standard voltage 
- Inspect heater control (blower switch)
- Remove the heater control.
- Measure the resistance of the switch.
Standard resistance 
- Inspect blower resistor
- Remove the blower resistor.
- Measure the resistance of the resistor.
Standard resistance 
- Check wire harness (heater control (blower switch) - blower resistor)
- Disconnect the e24 heater control connector.
- Disconnect the e55 blower resistor connector.
- Measure the resistance of the wire harness side connectors.
Standard resistance 
- Check wire harness (blower resistor - blower motor)
- Disconnect the e55 blower resistor connector.
- Disconnect the e54 motor connector
- Measure the resistance of the wire harness side connectors.
Standard resistance 
- Check wire harness (blower motor - body ground)
- Disconnect the e54 motor connector.
- Measure the resistance of the wire harness side connector.
Standard resistance 
- Measure the voltage of the wire harness side connector.
Standard voltage 
- Check wire harness (air conditioning amplifier - battery)
- Disconnect the e36 amplifier connector.
- Measure the voltage of the wire harness side connector.
Standard voltage 
- Check wire harness (air conditioning amplifier - body ground)
- Disconnect the e36 amplifier connector.
- Measure the resistance of the wire harness side connector.
Standard resistance 
Proceed to next circuit inspection shown in problem symptoms table
Multiplex communication circuit
Description
The air conditioning amplifier communicates data with the ecm and combination
meter through the can
communication system.
Wiring diagram
Inspection procedure
Check dt ...
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 diag ...
Other materials:
Air conditioning control panel does not operate
Description
This circuit consists of the air conditioning control and the air
conditioning amplifier. When the air
conditioning control is operated, signals are transmitted to the air
conditioning amplifier through the lin
communication system.
If the lin communication system malfunctions, ...
Removal (2005/11-2006/01)
Disconnect cable from negative battery
terminal
Caution:
Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent airbag and seat belt pretensioner activation.
Remove front door scuff plate lh
Using a screwdriver, detach the 10 cla ...
Ig1 relay
On-vehicle inspection
Disconnect cable from negative battery
terminal
Caution:
Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent airbag and seat belt pretensioner activation.
Remove ig1 relay
Remove the ig1 relay from the i ...
