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
![Toyota RAV4. Blower motor circuit](images/books/256/44/2.htm118.jpg)
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![](images/books/256/44/2.htm89.gif)
![](images/books/256/44/2.htm92.gif)
- Inspect heater relay (marking: htr)
![Toyota RAV4. Inspect heater relay (marking: htr)](images/books/256/44/2.htm119.jpg)
- Remove the heater relay from the instrument panel
junction block.
- Measure the resistance of the relay.
Standard resistance ![](images/books/256/44/2.htm120.jpg)
![](images/books/256/44/2.htm94.gif)
- Inspect blower motor
![Toyota RAV4. Inspect blower motor](images/books/256/44/2.htm121.jpg)
- 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 ![](images/books/256/44/2.htm122.jpg)
![](images/books/256/44/2.htm98.gif)
- 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 ![](images/books/256/44/2.htm123.jpg)
![Toyota RAV4. Check wire harness (heater control (blower switch) - battery)](images/books/256/44/2.htm124.jpg)
![](images/books/256/44/2.htm4.gif)
- Inspect heater control (blower switch)
![Toyota RAV4. Inspect heater control (blower switch)](images/books/256/44/2.htm17.jpg)
- Remove the heater control.
- Measure the resistance of the switch.
Standard resistance ![](images/books/256/44/2.htm18.jpg)
![](images/books/256/44/2.htm50.gif)
- Inspect blower resistor
![Toyota RAV4. Inspect blower resistor](images/books/256/44/2.htm24.jpg)
- Remove the blower resistor.
- Measure the resistance of the resistor.
Standard resistance ![](images/books/256/44/2.htm25.jpg)
![](images/books/256/44/2.htm54.gif)
- Check wire harness (heater control (blower switch) - blower resistor)
![Toyota RAV4. Check wire harness (heater control (blower switch) - blower resistor)](images/books/256/44/2.htm28.jpg)
- Disconnect the e24 heater control connector.
- Disconnect the e55 blower resistor connector.
- Measure the resistance of the wire harness side
connectors.
Standard resistance ![](images/books/256/44/2.htm33.jpg)
![](images/books/256/44/2.htm58.gif)
- Check wire harness (blower resistor - blower motor)
![Toyota RAV4. Check wire harness (blower resistor - blower motor)](images/books/256/44/2.htm125.jpg)
- Disconnect the e55 blower resistor connector.
- Disconnect the e54 motor connector
- Measure the resistance of the wire harness side
connectors.
Standard resistance ![](images/books/256/44/2.htm126.jpg)
![](images/books/256/44/2.htm62.gif)
- Check wire harness (blower motor - body ground)
![Toyota RAV4. Check wire harness (blower motor - body ground)](images/books/256/44/2.htm127.jpg)
- Disconnect the e54 motor connector.
- Measure the resistance of the wire harness side
connector.
Standard resistance ![](images/books/256/44/2.htm128.jpg)
- Measure the voltage of the wire harness side connector.
Standard voltage ![](images/books/256/44/2.htm129.jpg)
![](images/books/256/44/2.htm64.gif)
- Check wire harness (air conditioning amplifier - battery)
![Toyota RAV4. Check wire harness (air conditioning amplifier - battery)](images/books/256/44/2.htm130.jpg)
- Disconnect the e36 amplifier connector.
- Measure the voltage of the wire harness side connector.
Standard voltage ![](images/books/256/44/2.htm131.jpg)
![](images/books/256/44/2.htm67.gif)
- Check wire harness (air conditioning amplifier - body ground)
![Toyota RAV4. Check wire harness (air conditioning amplifier - body ground)](images/books/256/44/2.htm132.jpg)
- Disconnect the e36 amplifier connector.
- Measure the resistance of the wire harness side
connector.
Standard resistance ![](images/books/256/44/2.htm133.jpg)
![](images/books/256/44/2.htm69.gif)
Proceed to next circuit inspection shown in problem symptoms table
Description
The air conditioning amplifier communicates data with the ecm and combination
meter through the can
communication system.
Wiring diagram
Inspection procedure
Check dt ...
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:
Mil circuit
Description
The mil (malfunction indicator lamp) is used to indicate vehicle malfunction
detections by the ecm.
When the ignition switch is turned on, power is supplied to the mil circuit, and
the ecm provides the
circuit ground which illuminates the mil.
The mil operation can be checked ...
Installation
Replace roof carrier seal
Remove the seals.
Install new seals as shown in the illustration.
Install roof rack leg front lh
Install the leg cushion front.
Install the roof rack leg front with the 2 screws.
Torque: 2.8 To 5.0 N*m (29 to 51 kgf*cm, 25 to 44
in.*Lbf)
...
Disassembly
Fix differential carrier sub-assembly
Fix the rear differential carrier in place with the
overhaul attachment.
Remove stud bolt
Remove the 4 stud bolts from the transmission
coupling.
Remove differential drain plug
Using a 10 mm socket hexagon wrench, remove ...