Heating Air Conditioning. Air Conditioning System (For Automatic Air Conditioning System) Rear 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 (REAR BLOWER MOTOR)

CHECK HARNESS AND CONNECTOR (WIRING AIR CONDITIONING HARNESS - BODY GROUND)

CHECK HARNESS AND CONNECTOR (WIRING AIR CONDITIONING HARNESS - BATTERY)

CHECK WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY (SI VOLTAGE)

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - WIRING AIR CONDITIONING HARNESS)

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (BLWH SIGNAL)

CHECK WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY (OPERATION)

INSPECT REAR BLOWER MOTOR

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

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

WIRING DIAGRAM

INSPECTION PROCEDURE

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

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

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

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

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

Go to step 2

Go to step 5

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

2.CHECK HARNESS AND CONNECTOR (WIRING AIR CONDITIONING HARNESS - BODY GROUND)

Disconnect the wiring air conditioning harness sub-assembly connector.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.CHECK HARNESS AND CONNECTOR (WIRING AIR CONDITIONING HARNESS - BATTERY)

Disconnect the wiring air conditioning harness sub-assembly connector.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.CHECK WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY (SI VOLTAGE)

Disconnect the E36 amplifier connector.

Reconnect the wiring air conditioning harness sub-assembly connector.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
8 (SI) - Body ground
Engine switch on (IG)
4.5 to 5.5 V

Go to step 7

OK

5.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - WIRING AIR CONDITIONING HARNESS)

Disconnect the E36 amplifier connector.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
E36-17 (BLWH) - E36-1 (GND)
Engine switch on (IG)
Blower switch off
4.5 to 5.5 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (BLWH SIGNAL)

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

Using an oscilloscope, check the waveform.
Measurement Condition
Item
Content
Terminal No.(Symbol)
E36-17 (BLWH) - E36-1 (GND)
Tool Setting
1 V/DIV., 500 μs/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.

Measurement Condition
Item	Content
Terminal No.(Symbol)	E36-17 (BLWH) - E36-1 (GND)
Tool Setting	1 V/DIV., 500 μs/DIV.
Condition	Engine switch on (IG) Blower switch: off → on

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)

OK

7.CHECK WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY (OPERATION)

Replace the wiring air conditioning harness sub-assembly with a normal one and check that the condition returns to normal.
OK:
Same problem does not occur.

Go to step 8

REPLACE WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY

8.INSPECT REAR BLOWER MOTOR

Disconnect the z32 motor connector.

Connect the positive (+) lead of the battery to terminal 2 and the negative (-) lead to terminal 1, then check that the rear blower motor operates smoothly.
OK:
The rear blower motor operates smoothly.

REPLACE REAR BLOWER MOTOR (Click here)

REPLACE REAR BLOWER MOTOR CONTROLLER (Click here)

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

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