Inspection Procedure

HINT:

This circuit uses the LIN communication line. Before performing the inspection, check that the LIN communication system is functioning normally (see HOW TO PROCEED WITH TROUBLESHOOTING ).

1. PERFORM ACTIVE TEST BY TECHSTREAM (DEFOGGER RELAY) 
   1. Select the Active Test using the Techstream to generate a control command, and then check that the rear window defogger operates.

      Air Conditioner 

      AIR CONDITIONER - TECHSTREAM TESTER DISPLAY REFERENCE CHART
      
      

      Tester Display	Test Part	Control Range	Diagnostic Note
      Defogger Relay (Rear)	Rear window defogger relay operation	OFF or ON	-

   OK: Rear window defogger operates normally. 

   NG:  Go to step  3

   OK: Go to Next Step 

2. CHECK INTEGRATION CONTROL AND PANEL (OPERATION) 
   1. Temporarily replace the integration control and panel with a new or normally functioning one.
      1. For Column Shift Type, refer to the following procedures (see REMOVAL ).
      2. For Floor Shift Type, refer to the following procedures (see REMOVAL ).
   2. Check that the malfunction disappears.

      OK: Malfunction disappears. 

   NG: REPLACE AIR CONDITIONING AMPLIFIER  (See REMOVAL )

   OK: END (INTEGRATION CONTROL AND PANEL IS DEFECTIVE) 

3. INSPECT FUSE (DEFOG) 
   1. Remove the DEFOG H-fuse from the engine room relay block.
   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      FUSE (DEFOG) TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Condition	Specified Condition
      DEFOG H-fuse	Always	Below 1 Ω

   NG: REPLACE FUSE 

   OK: Go to Next Step 

4. INSPECT DEFOGGER RELAY (DEFOG) 
   1. Remove the defogger relay from the engine room relay block.
   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      DEFOGGER RELAY (DEFOG) TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Condition	Specified Condition
      3-4	When battery voltage is not applied between terminals 1 and 2	Below 1 Ω
      3-5		10 kΩ or higher
      3-4	When battery voltage is applied to terminals 1 and 2	10 kΩ or higher
      3-5		Below 1 Ω

      Fig 1: Inspecting Defogger Relay (DEFOG)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPLACE DEFOGGER RELAY 

   OK: Go to Next Step 

5. CHECK HARNESS AND CONNECTOR (DEFOGGER RELAY - BATTERY AND AIR CONDITIONING AMPLIFIER) 
   1. Remove the defogger relay from the engine room relay block.
   2. Disconnect the J19 air conditioning amplifier connector.
   3. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      HARNESS AND CONNECTOR (DEFOGGER RELAY - BATTERY AND AIR CONDITIONING AMPLIFIER) VOLTAGE
      
      

      Tester Connection	Condition	Specified Condition
      Defogger relay terminal 1 - Body ground	Ignition switch ON	11 to 14 V
      Defogger relay terminal 5 - Body ground	Always	11 to 14 V

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

      Standard resistance 

      HARNESS AND CONNECTOR (DEFOGGER RELAY - BATTERY AND AIR CONDITIONING AMPLIFIER) RESISTANCE
      
      

      Tester Connection	Condition	Specified Condition
      Defogger relay terminal 2 - J19-38 (RDEF)	Always	Below 1 Ω

      Fig 2: Checking Harness And Connector (Defogger Relay - Battery and Air Conditioning Amplifier)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to Next Step 

6. CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER - DEFOGGER RELAY AND BODY GROUND) 
   1. Disconnect the P9 and P10 defogger connectors.
   Fig 3: Identifying P9 And P10 Defogger Connector Terminals
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Remove the defogger relay from the engine room relay block.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER - DEFOGGER RELAY AND BODY GROUND) TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Condition	Specified Condition
      P9-1 - Defogger relay terminal 3	Always	Below 1 Ω
      P10-1 - Body ground
      Defogger relay terminal 4 - Body ground
      P9-1 - Body ground	Always	10 kΩ or higher

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to Next Step 

7. CHECK AIR CONDITIONING AMPLIFIER (OPERATION) 
   1. Temporarily replace the air conditioning amplifier with a new or normally functioning one (see REMOVAL ).
   2. Check that the malfunction disappears.

      OK: Malfunction disappears. 

   NG: REPAIR REAR WINDOW DEFOGGER  (see REPAIR  )

   OK: END (AIR CONDITIONING AMPLIFIER IS DEFECTIVE)