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

DESCRIPTION

WIRING DIAGRAM

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (BLOWER MOTOR)

INSPECT FUSE (HTR)

CHECK WIRE HARNESS (BLOWER MOTOR - BODY GROUND)

CHECK WIRE HARNESS (BLOWER MOTOR - BATTERY)

CHECK BLOWER W/ FAN MOTOR SUB-ASSEMBLY

CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - BODY GROUND)

CHECK AIR CONDITIONING AMPLIFIER

DESCRIPTION

WIRING DIAGRAM

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch on (IG) and turn the intelligent tester main switch ON.
   

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

   Air conditioning amplifier:

   
   

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

   
   

   Result:

   
   

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

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
   

1. Disconnect the E60 motor connector.
   

2. Measure the resistance of the wire harness side connector.
   

   Standard resistance:

   Tester Connection	Specified Condition
   E60-1 (GND) - Body ground	Below 1 Ω

1. Disconnect the E60 motor connector.
   

2. Measure the voltage of the wire harness side connector.
   

Standard voltage:

Tester Connection	Condition	Specified Condition
E60-3 (+B) - Body ground	Ignition switch on (IG)	10 to 14 V

1. Disconnect the E41 amplifier connector.
   

2. Connect the E60 motor connector.
   

3. Measure the voltage of the connector.
   

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   E60-2 (SI) - Body ground	Ignition switch on (IG)	4.5 to 5.5 V

1. Disconnect the E41 amplifier connector.
   

2. Measure the voltage of the wire harness side connector.
   

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   E41-23 (BLW) - Body ground	Ignition switch on (IG) Blower switch OFF	4.5 to 5.5 V

1. Remove the air conditioning amplifier with its connectors still connected.
   

2. Check the waveform of the amplifier connector.
   

   OK:

   Waveform is as shown in the illustration.
   

   HINT:

   The waveform varies with the blower level.

   Item	Content
   Tester Connection	BLW (E41-23) - GND (E41-14)
   Tool Setting	1 V/DIV., 500 μsec./DIV.
   Condition	Ignition switch on (IG) Blower switch LO