Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

PERFORM ACTIVE TEST BY TECHSTREAM

Connect Techstream to the DLC3.
Turn the ignition switch ON and turn Techstream ON.

Select the item below in the Active Test, and then check that the blower motor operates.

Air conditioning amplifier

DATA LIST - AIR CONDITIONING AMPLIFIER

Item	Test Details / Display	Diagnostic Note
Blower Motor	Blower motor / Min.: 0, Max.: 31	-

Result

RESULT REFERENCE

Result	Proceed to
NG (blower motor does not operate)	A
NG (blower motor operates but does not change speed)	B
OK	C

B: Go to step 6

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

A: Go to next step

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

OK: Go to next step

CHECK WIRE HARNESS (BLOWER MOTOR - BODY GROUND)

Disconnect the E53 motor connector.

Fig 1: Identifying E53 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the wire harness side connector.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
E53-1 (GND) - Body ground	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: Go to next step

CHECK WIRE HARNESS (BLOWER MOTOR - BATTERY)

Disconnect the E53 motor connector.

Fig 2: Identifying E53 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage of the wire harness side connector.

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
E53-3 (+B) - Body ground	Ignition switch ON	10 to 14 V

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: Go to next step

CHECK BLOWER W/ FAN MOTOR SUB-ASSEMBLY

Disconnect the E37 amplifier connector.
Connect the E53 motor connector.

Fig 3: Connecting E53 Blower Motor Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage of the connector.

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
E53-2 (SI) - Body ground	Ignition switch ON	4.5 to 5.5 V

NG: REPLACE BLOWER W/ FAN MOTOR SUB-ASSEMBLY

OK: Go to next step

CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - BODY GROUND)

Disconnect the E37 amplifier connector.

Fig 4: Identifying E37 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage of the wire harness side connector.

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
E37-23 (BLW) - Body ground	Ignition switch ON Blower switch OFF	4.5 to 5.5 V

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: Go to next step

CHECK AIR CONDITIONING AMPLIFIER

Remove the air conditioning amplifier with its connectors still connected.

Check the waveform of the amplifier connector.

OK:

Waveform is as shown in the illustration.

Fig 5: Blower Motor Control Signal Waveform Graph

HINT:

The waveform varies with the blower level.

ITEM CHART

Item	Content
Tester Connection	BLW (E37-23) - GND (E37-14)
Tool Setting	1 V/DIV, 500 μsec./DIV.
Condition	Ignition switch ON Blower switch LO

NG: REPLACE AIR CONDITIONING AMPLIFIER

OK: REPLACE BLOWER W/ FAN MOTOR SUB-ASSEMBLY