Inspection Procedure

WARNING: This page is about a different car, the 2007 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT FUSE (HTR)
1. Remove the HTR fuse from the engine room No. 2 relay block.
2. Measure the resistance of the fuse.
  Standard resistance: Below 1
NG: REPLACE FUSE

OK: GO TO NEXT STEP.

INSPECT HEATER RELAY (Marking: HTR)

Remove the heater relay from the instrument panel junction block.

Measure the resistance of the relay.

Standard resistance

Fig 1: Identifying Heater Relay Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TERMINALS RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
3 - 4	Below 1
3 - 5	10 k or higher
3 - 4	10 k or higher (when battery voltage is applied to terminals 1 and 2)
3 - 5	Below 1 (when battery voltage is applied to terminals 1 and 2)

NG: REPLACE HEATER RELAY

OK: GO TO NEXT STEP.

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.

Fig 2: Inspecting Blower Motor
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: The blower motor operates smoothly.

Measure the current.

Standard current

TERMINALS CURRENT SPECIFICATION (CONNECTOR(S) DISCONNECTED)

Tester Connection	Condition	Specified Condition
E54-1 - E54-2	Blower motor operates	1 to 3 A

NG: REPLACE BLOWER MOTOR

OK: GO TO NEXT STEP.

CHECK WIRE HARNESS (HEATER CONTROL (BLOWER SWITCH) - BATTERY)

Disconnect the E24 heater control connector.

Fig 3: Identifying E24 Heater Control Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage of the wire harness side connector.

Standard voltage

TERMINALS VOLTAGE SPECIFICATION (CONNECTOR(S) DISCONNECTED)

Tester Connection	Condition	Specified Condition
E24-4 (LO) - Body ground	Ignition switch ON	10 to 14 V

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: GO TO NEXT STEP.

INSPECT HEATER CONTROL (BLOWER SWITCH)

Remove the heater control.

Fig 4: Identifying Heater Control Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the switch.

Standard resistance

TERMINALS RESISTANCE SPECIFICATION

Tester Connection	Switch Position	Specified Condition
ALL - 5 (E)	0	10 k or higher
4 (LO) - 5 (E)	1	Below 1
4 (LO) - 5 (E) - 9 (M1)	1 to 2	Below 1
4 (LO) - 5 (E) - 9 (M1)	2	Below 1
(LO) - (E) - 9 (M1) - 10 (M2)	2 to 3	Below 1
4 (LO) - 5 (E) - 10 (M2)	3	Below 1
4 (LO) - 5 (E) - 10 (M2) - 6(HI)	3 to 4	Below 1
4 (LO) - 5 (E) - 6 (HI)	4	Below 1

NG: REPLACE HEATER CONTROL

OK: GO TO NEXT STEP.

INSPECT BLOWER RESISTOR

Remove the blower resistor.

Fig 5: Identifying Blower Resistor Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the resistor.

Standard resistance

TERMINALS RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
E55-4 (E) - E55-1 (HI)	3.12 to 3.60
E55-4 (E) - E55-3 (M2)	1.45 to 1.67
E55-4 (E) - E55-2 (M1)	0.52 to 0.60

NG: REPLACE BLOWER RESISTOR

OK: GO TO NEXT STEP.

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.

Fig 6: Identifying Blower Resistor And Heater Control Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance

TERMINALS RESISTANCE SPECIFICATION (CONNECTOR(S) DISCONNECTED)

Tester Connection	Specified Condition
E24-6 (HI) - E55-1 (HI)	Below 1
E24-9 (M1) - E55-2 (M1)	Below 1
E24-10 (M2) - E55-3 (M2)	Below 1
E24-5 (E) - Body ground	Below 1
E55-4 (E) - Body ground	Below 1

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: GO TO NEXT STEP.

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.

Fig 7: Identifying Blower Resistor And Blower Motor Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance

TERMINALS RESISTANCE SPECIFICATION (CONNECTOR(S) DISCONNECTED)

Tester Connection	Specified Condition
E55-4 (E) - E54-1	Below 1

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: GO TO NEXT STEP.

CHECK WIRE HARNESS (BLOWER MOTOR - BODY GROUND)

Disconnect the E54 motor connector.

Fig 8: Identifying E54 Motor Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the wire harness side connector.

Standard resistance

TERMINALS RESISTANCE SPECIFICATION (CONNECTOR(S) DISCONNECTED)

Tester Connection	Specified Condition
E54-2 - Body ground	Below 1

Measure the voltage of the wire harness side connector.

Standard voltage

TERMINALS VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
E54-2 - Body ground	Ignition switch ON Heater control (blower switch) 1	10 to 14 V

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: GO TO NEXT STEP.

CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - BATTERY)

Disconnect the E36 amplifier connector.

Fig 9: Disconnecting E36 Air Conditioning Amplifier Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage of the wire harness side connector.

Standard voltage

TERMINALS VOLTAGE SPECIFICATION (CONNECTOR(S) DISCONNECTED)

Tester Connection	Condition	Specified Condition
E36-21 (SBLW) - Body ground	Ignition switch ON Heater control (blower switch) 0	10 to 14 V

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: GO TO NEXT STEP.

CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - BODY GROUND)

Disconnect the E36 amplifier connector.

Fig 10: Disconnecting E36 Air Conditioning Amplifier Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the wire harness side connector.

Standard resistance

TERMINALS RESISTANCE SPECIFICATION (CONNECTOR(S) DISCONNECTED)

Tester Connection	Specified Condition
E36-24 (GND) - Body ground	Below 1

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE