Toyota RAV4 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
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:
General maintenance (2005/11-2006/01)
General notes
Maintenance requirements vary depending on the
country.
Check the maintenance schedule in the owner's
manual supplement.
Following the maintenance schedule is mandatory.
Determine the appropriate time to service the vehicle
using either miles driven or time elapsed ...
Cruise control switch circuit
Description
This circuit sends signals to the ecm depending on the cruise control switch
condition. The battery
supplies positive (+) battery voltage to the cruise control switch. Then
terminal ccs of the ecm receives
the voltage according to the switch condition.
Wiring diagram
Inspect ...
Knock sensor 1 circuit
Description
Flat type knock sensors (non-resonant type) have structures that can detect
vibrations over a wide band
of frequencies: between approximately 6 khz and 15 khz.
A knock sensor is fitted onto the engine block to detect engine knocking.
The knock sensor contains a piezoelectri ...