Heating Air Conditioning. Air Conditioning System (For Automatic Air Conditioning System) Blower Motor Circuit

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200

Heating Air Conditioning. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (FRONT BLOWER MOTOR)

CHECK HARNESS AND CONNECTOR (FRONT BLOWER MOTOR - BODY GROUND)

CHECK HARNESS AND CONNECTOR (FRONT BLOWER MOTOR - BATTERY)

CHECK FRONT BLOWER MOTOR (SI VOLTAGE)

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - FRONT BLOWER MOTOR)

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (BLW SIGNAL)

AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System) - Blower Motor Circuit

DESCRIPTION

Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Blower Motor Circuit

The blower motor is operated by signals from the air conditioning amplifier assembly. The blower motor speed signals are transmitted by changes in the duty ratio.
Duty Ratio:
The duty ratio is the ratio of the blower motor OPEN time (T1) to the total of the blower motor OPEN and LO time (T2).
The blower motor controller controls the blower motor speed.

WIRING DIAGRAM

INSPECTION PROCEDURE

1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (FRONT BLOWER MOTOR)

Select the Active Test, use the intelligent tester to generate a control command, and then check that the front blower motor operates.

Air Conditioner
Tester Display
Test Part
Control Range
Diagnostic Note
Blower Motor
Front blower motor
Min.: 0, Max.: 31
-
Result
Result
Proceed to
Front blower motor operates normally
A
Front blower motor does not operate
B
Front blower motor operates but does not change speed
C

Air Conditioner
Tester Display	Test Part	Control Range	Diagnostic Note
Blower Motor	Front blower motor	Min.: 0, Max.: 31	-

Result
Result	Proceed to
Front blower motor operates normally	A
Front blower motor does not operate	B
Front blower motor operates but does not change speed	C

Go to step 2

Go to step 6

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)

2.CHECK HARNESS AND CONNECTOR (FRONT BLOWER MOTOR - BODY GROUND)

Disconnect the A29 motor connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
A29-1 (GND) - Body ground
Always
Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.CHECK HARNESS AND CONNECTOR (FRONT BLOWER MOTOR - BATTERY)

Disconnect the A29 motor connector.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Condition
Specified Condition
A29-3 (+B) - Body ground
Always
11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.CHECK FRONT BLOWER MOTOR (SI VOLTAGE)

Disconnect the E36*1 or E81*2 amplifier connector.

Reconnect the A29 motor connector.

Measure the voltage according to the value(s) in the table below.
HINT:
*1: for LHD
*2: for RHD
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
A29-2 (SI) - Body ground
Engine switch on (IG)
4.5 to 5.5 V

REPLACE FRONT BLOWER MOTOR (Click here)

OK

5.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - FRONT BLOWER MOTOR)

w/ Rear Heater
1. Disconnect the E36 amplifier connector.
2. Measure the voltage according to the value(s) in the table below.
  Standard Voltage:
  Tester Connection
  Switch Condition
  Specified Condition
  E36-3 (BLW) - E36-1 (GND)
  Engine switch on (IG)
  Blower switch off
  4.5 to 5.5 V

w/o Rear Heater
1. Disconnect the E81 amplifier connector.
2. Measure the voltage according to the value(s) in the table below.
  Standard Voltage:
  Tester Connection
  Switch Condition
  Specified Condition
  E81-23 (BLW) - E81-1 (GND)
  Engine switch on (IG)
  Blower switch off
  4.5 to 5.5 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)

6.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - FRONT BLOWER MOTOR)

w/ Rear Heater
1. Disconnect the E36 amplifier connector.
2. Measure the voltage according to the value(s) in the table below.
  Standard Voltage:
  Tester Connection
  Switch Condition
  Specified Condition
  E36-3 (BLW) - E36-1 (GND)
  Engine switch on (IG)
  Blower switch off
  4.5 to 5.5 V

w/o Rear Heater
1. Disconnect the E81 amplifier connector.
2. Measure the voltage according to the value(s) in the table below.
  Standard Voltage:
  Tester Connection
  Switch Condition
  Specified Condition
  E81-23 (BLW) - E81-1 (GND)
  Engine switch on (IG)
  Blower switch off
  4.5 to 5.5 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (BLW SIGNAL)

w/ Rear Heater
1. Remove the air conditioning amplifier assembly with its connectors still connected (Click here).
2. Using an oscilloscope, check the waveform.
  Measurement Condition
  Item
  Content
  Terminal No. (Symbol)
  E36-3 (BLW) - E36-1 (GND)
  Tool Setting
  1 V/DIV., 500 μsec./DIV.
  Condition
  Engine switch on (IG)
  Blower switch: off → on
  OK:
  Waveform is as shown in the illustration.
  HINT:
  Waveform varies with the blower level.

w/o Rear Heater
1. Remove the air conditioning amplifier assembly with its connectors still connected (Click here).
2. Using an oscilloscope, check the waveform.
  Measurement Condition
  Item
  Content
  Terminal No. (Symbol)
  E81-23 (BLW) - E81-1 (GND)
  Tool Setting
  1 V/DIV., 500 μsec./DIV.
  Condition
  Engine switch on (IG)
  Blower switch: OFF → ON
  OK:
  Waveform is as shown in the illustration.
  HINT:
  Waveform varies with the blower level.

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)

REPLACE FRONT BLOWER MOTOR (Click here)

Tester Connection	Condition	Specified Condition
A29-1 (GND) - Body ground	Always	Below 1 Ω

Tester Connection	Switch Condition	Specified Condition
A29-2 (SI) - Body ground	Engine switch on (IG)	4.5 to 5.5 V

Item	Content
Terminal No. (Symbol)	E36-3 (BLW) - E36-1 (GND)
Tool Setting	1 V/DIV., 500 μsec./DIV.
Condition	Engine switch on (IG) Blower switch: off → on