Air Conditioning System (For Manual Air Conditioning System) - Blower Motor Circuit

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - HEATING / AIR CONDITIONING

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (BLOWER MOTOR)

CHECK HARNESS AND CONNECTOR (BLOWER WITH FAN MOTOR - BATTERY AND BODY GROUND)

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

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

REPLACE BLOWER WITH FAN MOTOR SUB-ASSEMBLY

CHECK BLOWER WITH FAN MOTOR SUB-ASSEMBLY

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

DESCRIPTION

Air Conditioning System (For Manual Air Conditioning System) - Blower Motor Circuit. HEATING / AIR CONDITIONING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

The blower with fan motor sub-assembly operates according to signals from the air conditioning amplifier assembly. The blower with fan motor sub-assembly speed signals are transmitted by changes in the duty ratio.


Duty Ratio:


The duty ratio is the ratio of the blower with fan motor sub-assembly on time (T1) to the total of the blower with fan motor sub-assembly on and off time (T2).


The air conditioning amplifier assembly controls the blower with fan motor sub-assembly speed.


WIRING DIAGRAM

Air Conditioning System (For Manual Air Conditioning System) - Blower Motor Circuit. HEATING / AIR CONDITIONING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

  • NOTICE:
  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (BLOWER MOTOR)

Select the Active Test, use the intelligent tester to generate a control command, and then check that the blower with fan motor sub-assembly operates ().

Air Conditioner
Tester DisplayTest PartControl RangeDiagnostic Note
Blower Motor Blower with fan motor sub-assemblyMin.: 0, Max.: 31-
  • OK:
  • Blower with fan motor sub-assembly operates and blower with fan motor sub-assembly speed changes.
NG
Go to step 2
OK
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE ()
2.CHECK HARNESS AND CONNECTOR (BLOWER WITH FAN MOTOR - BATTERY AND BODY GROUND)
Air Conditioning System (For Manual Air Conditioning System) - Blower Motor Circuit. HEATING / AIR CONDITIONING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the A29 blower with fan motor sub-assembly connector.

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

  • Standard Voltage:
  • Tester ConnectionConditionSpecified Condition
    A29-3 (+B) - Body groundAlways11 to 14 V

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    A29-1 (GND) - Body groundAlwaysBelow 1 Ω
Text in Illustration
*aFront view of wire harness connector
(to Blower with Fan Motor Sub-assembly)
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
3.CHECK HARNESS AND CONNECTOR (BLOWER WITH FAN MOTOR - AIR CONDITIONING AMPLIFIER)

Disconnect the E81 air conditioning amplifier assembly connector.

Disconnect the A29 blower with fan motor sub-assembly connector.

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    E81-23 (BLW) - A29-2 (SI)AlwaysBelow 1 Ω
    E81-23 (BLW) - Body groundAlways10 kΩ or higher
    E81-14 (GND) - Body groundAlwaysBelow 1 Ω
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
4.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
Air Conditioning System (For Manual Air Conditioning System) - Blower Motor Circuit. HEATING / AIR CONDITIONING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Remove the air conditioning amplifier assembly with its connectors still connected ().

Using an oscilloscope, check the waveform.

Measurement Condition
ItemContent
Terminal No. (Symbol)E81-23 (BLW) - E81-14 (GND)
Tool Setting1 V/DIV., 500 μs/DIV.
ConditionIgnition switch ON
Blower switch LO level
  • OK:
  • Waveform is as shown in the illustration.
Text in Illustration
*aComponent with harness connected
(Air Conditioning Amplifier Assembly)
  • HINT:
  • Waveform varies with the blower level.
NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
OK
5.REPLACE BLOWER WITH FAN MOTOR SUB-ASSEMBLY

Temporarily replace the blower with fan motor sub-assembly with a new or normally functioning one ().

NEXT
6.CHECK BLOWER WITH FAN MOTOR SUB-ASSEMBLY

Operate the blower with fan motor sub-assembly to check that it functions properly.

  • OK:
  • Blower with fan motor sub-assembly operates normally.
NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
OK
END (BLOWER WITH FAN MOTOR SUB-ASSEMBLY IS FAULTY)