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

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   PERFORM ACTIVE TEST USING INTELLIGENT TESTER (REAR BLOWER MOTOR)

   
   

   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 rear blower motor operates.

      Table 1. Active Test / Air Conditioner:

      Tester Display	Test Part	Control Range	Diagnostic Note
      R Blower Motor	Rear 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

   
   
   • AClick here
   • BClick here
   • CClick here
2. Click here

   INSPECT FUSE (RR CLR)

   
   

   1. Remove the RR CLR H-fuse from the main body ECU.

   2. Measure the resistance of the H-fuse.

      Standard resistance
      Tester Connection Condition Specified Condition RR CLR H-fuse Always Below 1 Ω

   
   
   • OKClick here
   • NGClick here
3. Click here

   INSPECT REAR BLOWER MOTOR

   
   
   1. 

      Disconnect the N9 motor connector.

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

      OK
      The rear blower motor operates smoothly.

   3. Measure the current of the connector.

      Standard current
      Tester Connection Condition Specified Condition N9-1 - N9-2 Rear blower motor operates Below 13.5 A

   
   
   • OKClick here
   • NGClick here
4. Click here

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

   
   
   1. 

      Disconnect the N10 rear motor control connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition N10-6 (GND) - Body ground Always Below 1 Ω

   
   
   • OKClick here
   • NGClick here
5. Click here

   CHECK HARNESS AND CONNECTOR (REAR BLOWER MOTOR CONTROL - BATTERY)

   
   
   1. 

      Disconnect the N10 rear motor control connector.

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

      Standard voltage
      Tester Connection Condition Specified Condition N10-1 (+B) - Body ground Ignition switch on (IG) 11 to 14 V

   
   
   • OKClick here
   • NGClick here
6. Click here

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

   
   
   1. 

      Disconnect the D34 amplifier connector.

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

      Standard voltage
      Tester Connection Condition Specified Condition D34-22 (BLWH) - D34-20 (GND2) Ignition switch on (IG) Blower switch OFF 4.5 to 5.5 V

   
   
   • OKClick here
   • NGClick here
7. Click here

   CHECK AIR CONDITIONING AMPLIFIER

   
   
   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.

      Tip:

      The waveform varies with the blower level.

      Item	Content
      Tester Connection	BLWH (D34-22) - GND2 (D34-20)
      Tool Setting	1 V/DIV., 500 μsec./DIV.
      Condition	Ignition switch on (IG) Blower switch LO

   
   
   • OKClick here
   • NGClick here
8. Click here

   REPLACE REAR BLOWER MOTORClick here

9. Click here

   PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLEClick here

10. Click here

    REPLACE FUSE

11. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

12. Click here

    REPLACE AIR CONDITIONING AMPLIFIERClick here