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

DESCRIPTION

The rear blower motor with fan sub-assembly is operated by signals from the air conditioning amplifier assembly. Rear blower motor speed signals are transmitted in accordance with changes in the duty ratio.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. PERFORM ACTIVE TEST USING GTS

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the GTS on.

   4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

   5. Check the operation by referring to the table below.

      
      Body Electrical > Air Conditioner > Active Test

      Tester Display	Measurement Item	Control Range	Diagnostic Note
      Rear Blower Motor	Rear blower motor with fan sub-assembly	Min.: 0 Max.: 31	-

      
      Body Electrical > Air Conditioner > Active Test

      Tester Display
      Rear Blower Motor

      Result
      Result Proceed to OK A NG (Rear blower motor with fan sub-assembly does not operate) B NG (Rear blower motor with fan sub-assembly operates but does not change speed) C

   
   

   A

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

   C

   GO TO STEP 9 Click here

   B

2. INSPECT REAR BLOWER MOTOR WITH FAN SUB-ASSEMBLY

   
   

   1. Disconnect the L18 rear blower motor with fan sub-assembly connector.

   2. 

      *a	Component without harness connected (Rear Blower Motor with Fan Sub-assembly)

      Connect a positive (+) lead from the battery to terminal 2 and a negative (-) lead to terminal 1, and check that the motor operates.

      OK
      The rear blower motor with fan sub-assembly operates smoothly.

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE REAR BLOWER MOTOR WITH FAN SUB-ASSEMBLY Click here

   OK

3. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR CONTROL - BODY GROUND)

   
   

   1. Disconnect the L19 blower motor control connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition L19-6 (GND) - Body ground Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

4. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR CONTROL - BATTERY)

   
   

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

      Standard Voltage
      Tester Connection Condition Specified Condition L19-1 (+B) - Body ground Always 11 to 14 V

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

5. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR CONTROL - REAR BLOWER MOTOR WITH FAN SUB-ASSEMBLY)

   
   

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

      Standard Resistance
      Tester Connection Condition Specified Condition L19-2 (VM) - L18-2 Always Below 1 Ω L19-2 (VM) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

6. CHECK HARNESS AND CONNECTOR (REAR BLOWER MOTOR WITH FAN SUB-ASSEMBLY - BODY GROUND)

   
   

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

      Standard Resistance
      Tester Connection Condition Specified Condition L18-1 - Body ground Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

7. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR CONTROL - AIR CONDITIONING AMPLIFIER ASSEMBLY)

   
   

   1. Disconnect the F81 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition F81-26 (BLWH) - L19-3 (SI) Always Below 1 Ω F81-26 (BLWH) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

8. INSPECT BLOWER MOTOR CONTROL

   
   

   1. Reconnect the L19 blower motor control connector.

   2. 

      *a	Front view of wire harness connector (to Air Conditioning Amplifier Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition F81-26 (BLWH) - Body ground Always 6.0 to 7.0 V

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE BLOWER MOTOR CONTROL Click here

   OK

9. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

   
   

   1. Reconnect the F81 air conditioning amplifier assembly connector.

   2. Turn the ignition switch to ON.

   3. Turn the rear blower switch on (LO).

   4. 

      *a	Component with harness connected (Air Conditioning Amplifier Assembly)

      Measure the waveform between terminal F81-26 (BLWH) of the air conditioning amplifier assembly and body ground.

      OK
      Waveform is similar to that shown in the illustration.

      Tech Tips

      The waveform varies with the blower level.

      Item	Content
      Tool Setting	1 V/DIV., 500 μs./DIV.
      Vehicle Condition	Ignition switch ON Rear blower switch: LO

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE BLOWER MOTOR CONTROL Click here

   NG

   REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here