Inspection Procedure

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

PERFORM ACTIVE TEST USING TECHSTREAM

Connect the Techstream to the DLC3
Turn the engine switch on (IG).
Turn the Techstream on.

Select the item below in the Active Test and then check that the relay operates.

Active Test / Air Conditioner

CONTROL RANGE AND DIAGNOSTIC NOTE

Tester Display	Test Part	Control Range	Diagnostic Note
Blower Motor (Blower Motor)	Blower motor	Min 0, Max 31	-

Result

RESULT DESCRIPTION

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

B: Go to step 2

C: Go to step 6

A: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )

INSPECT FUSE (HEATER)

Remove the HEATER fuse from the engine room relay block and junction block No 1

Measure the resistance according to the value(s) in the table below

Standard Resistance

STANDARD RESISTANCE SPECIFICATIONS

Tester Item	Condition	Specified Condition
HEATER fuse	Always	Below 1 Ω

Fig 1: Identifying Heater Fuse

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE FUSE (HEATER)

OK: Go to next step

CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BODY GROUND)

Disconnect the blower motor connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

STANDARD RESISTANCE SPECIFICATIONS

Tester Connection	Condition	Specified Condition
b1-1 (GND) - Body ground	Always	Below 1 Ω

Fig 2: Identifying B1 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BATTERY)

Measure the voltage according to the value(s) in the table below.

Standard Voltage

STANDARD VOLTAGE SPECIFICATIONS

Tester Connection	Condition	Specified Condition
b1-3 (+B) - Body ground	Always	11 to 14 V

Fig 3: Identifying B1 Connector Terminal (+B)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

INSPECT BLOWER MOTOR

Reconnect the blower motor connector

Measure the voltage according to the value(s) in the table below.

Standard Voltage

STANDARD VOLTAGE SPECIFICATIONS

Tester Connection	Condition	Specified Condition
b1-2 (S1) - Body ground	Always	4.5 to 5.5 V

Fig 4: Identifying B1 Connector Terminals (S1)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE BLOWER MOTOR (See REMOVAL )

OK: Go to next step

CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BODY GROUND)

Disconnect the A/C amplifier connector.

Measure the voltage according to the value(s) in the table below.

Standard Voltage

STANDARD VOLTAGE SPECIFICATIONS

Tester Connection	Condition	Specified Condition
J58-11 (BLW) - Body ground	Always	4.5 to 5.5 V

Fig 5: Identifying J58 Connector Terminals (BLW)

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

INSPECT A/C AMPLIFIER

Remove the A/C amplifier.
Reconnect the A/C amplifier connector
Turn the engine switch on (IG)
Turn the blower switch on (LO).

Measure the waveform between terminal J58-11 (BLW) of the A/C amplifier and body ground.

OK: Waveform is as shown in the illustration.

HINT.

The waveform varies with the blower speed

WAVEFORM REFERENCE GRAPH

Item	Content
Tool setting	1 V/DIV, 500 μs/DIV
Vehicle condition	Engine switch on (IG) Blower switch ON (LO)

Fig 6: Inspecting A/C Amplifier

NG: REPLACE A/C AMPLIFIER (See REMOVAL )

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