Air Conditioning System (For Automatic Air Conditioning System) Viscous Heater With Magnet Clutch Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING GTS (IDLE UP/PWR HEATER SWITCH)

PERFORM ACTIVE TEST USING GTS (VISCOUS HEATER)

CHECK HARNESS AND CONNECTOR (IDLE UP SWITCH - BATTERY AND BODY GROUND)

INSPECT IDLE UP SWITCH

CHECK HARNESS AND CONNECTOR (IDLE UP SWITCH - AIR CONDITIONING AMPLIFIER ASSEMBLY)

INSPECT VISCOUS HEATER RELAY (VICS HTR RELAY)

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - BATTERY)

CHECK HARNESS AND CONNECTOR (VISCOUS HEATER RELAY - VISCOUS WITH MAGNET CLUTCH HEATER ASSEMBLY AND BATTERY)

CHECK VISCOUS WITH MAGNET CLUTCH HEATER ASSEMBLY

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

1. Use the Data List to check if the idle up switch is functioning properly (Click here).
   
   

   Air Conditioner

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   IDLE UP/PWR HEAT Switch	Idle up switch / ON or OFF	ON: Idle up switch on OFF: Idle up switch off	-

   OK:

   The display is as specified in the normal condition column.
   

1. Select the Active Test, use the GTS to generate a control command, and then check that the viscous heater relay (VICS HTR) (Click here).
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Viscous Heater	Viscous heater relay	ON / OFF	-

   OK:

   Viscous heater relay operates using GTS.
   

1. Disconnect the idle up switch assembly connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   E97-3 (E) - Body ground	Always	Below 1 Ω

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   E97-2 (IND+) - Body ground	Ignition switch off	Below 1 V
   E97-2 (IND+) - Body ground	Ignition switch ON	11 to 14 V

1. Remove the idle up switch (Click here).
   

2. Inspect the idle up switch (Click here ).
   

1. w/ Rear Heater:
   

   1. Disconnect the E35 air conditioning amplifier assembly connector.
      

   2. Disconnect the E97 idle up switch connector.
      

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

      Standard Resistance:

      Tester Connection	Condition	Specified Condition
      E35-28 (SW 1) - E97-6 (+S)	Always	Below 1 Ω
      E35-28 (SW 1) or E97-6 (+S) - Body ground	Always	10 kΩ or higher

2. w/o Rear Heater:
   

   1. Disconnect the E81 air conditioning amplifier assembly connector.
      

   2. Disconnect the E97 idle up switch connector.
      

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

      Standard Resistance:

      Tester Connection	Condition	Specified Condition
      E81-4 (SW 1) - E97-6 (+S)	Always	Below 1 Ω
      E81-4 (SW 1) or E97-6 (+S) - Body ground	Always	10 kΩ or higher

1. Remove the viscous heater relay (VICS HTR) from the No. 1 engine room relay block.
   

2. Inspect the viscous heater relay (VICS HTR) (Click here).
   

1. w/ Rear Heater:
   

   1. Disconnect the air conditioning amplifier assembly connector.
      

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

      Standard Voltage:

      Tester Connection	Switch Condition	Specified Condition
      E36-32 (MGCA) - Body ground	Ignition switch off	Below 1 V
      E36-32 (MGCA) - Body ground	Ignition switch ON	11 to 14 V

2. w/o Rear Heater:
   

   1. Disconnect the air conditioning amplifier assembly connector.
      

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

      Standard Voltage:

      Tester Connection	Switch Condition	Specified Condition
      E81-17 (MGCA) - Body ground	Ignition switch off	Below 1 V
      E81-17 (MGCA) - Body ground	Ignition switch ON	11 to 14 V

1. *1: for LHD
   
2. *2: for RHD
   

1. Disconnect the 1Q, 1Y*1 or 1K*2 No. 1 engine room relay block connector.
   

2. Disconnect the C98 viscous with magnet clutch heater assembly connector
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   1Q-2 - C98- (MG+)	Always	Below 1 Ω
   1Q-2 or C98- (MG+ - Body ground	Always	10 kΩ or higher

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

      Standard Voltage:

      for LHD:

      Tester Connection	Condition	Specified Condition
      1Y-1 - Body ground	Always	11 to 14 V
      1Q-3 - Body ground	Ignition switch off	Below 1 V
      1Q-3 - Body ground	Ignition switch ON	11 to 14 V

      for RHD:

      Tester Connection	Condition	Specified Condition
      1K-1 - Body ground	Always	11 to 14 V
      1Q-3 - Body ground	Ignition switch off	Below 1 V
      1Q-3 - Body ground	Ignition switch ON	11 to 14 V

1. Replace the viscous with magnet clutch heater assembly with a new or known good one (Click here).
   

2. Check that the air conditioning system is operated normally.
   

   OK:

   Air conditioning system is operated normally.