WINDSHIELD DEICER SYSTEM Windshield Deicer does not Operate

DESCRIPTION

When the front deicer switch turns on, a front window deicer activation request signal from the air conditioning amplifier is sent via the CAN line to the multiplex network front light ECU (front controller). Then the multiplex network front light ECU (front controller) operates the windshield deicer.

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   PERFORM ACTIVE TEST USING GTS (DEICER RELAY [FRONT])

   
   

   1. Select the Active Test, using the GTS to generate a control command, and then check that the windshield deicer operates (Click here).

      Table 1. Air Conditioner

      Tester Display	Test Part	Control Range	Diagnostic Note
      Deicer Relay (Front)	DEICER relay operation	OFF / ON	-

      OK
      Windshield deicer operates normally

   
   
   • OKClick here
   • NGClick here
2. Click here

   CHECK AIR CONDITIONING AMPLIFIER

   
   

   1. Temporarily replace the air conditioning amplifier with a new or normally functioning one (Click here).

   2. Check that the malfunction disappears.

      OK
      Malfunction disappears.

   
   
   • OKClick here
   • NGClick here
3. Click here

   CHECK MULTIPLEX NETWORK FRONT LIGHT ECU

   
   

   1. Temporarily replace the multiplex network front light ECU (front controller) with a new or normally functioning one.

   2. Check that the malfunction disappears.

      OK
      Malfunction disappears.

   
   
   • OKClick here
   • NGClick here
4. Click here

   CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY

   
   

   1. Temporarily replace the multi-media module receiver assembly with a new or normally functioning one (Click here).

   2. Check that the malfunction disappears.

      OK
      Malfunction disappears.

   
   
   • OKClick here
   • NGClick here
5. Click here

   INSPECT DEICER RELAY

   
   

   1. Remove the DEICER relay from the No. 3 relay block.

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

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

   
   
   • OKClick here
   • NGClick here
6. Click here

   CHECK HARNESS AND CONNECTOR (DEICER RELAY - MULTIPLEX NETWORK FRONT LIGHT ECU [FRONT CONTROLLER] AND BATTERY)

   
   

   1. Remove the DEICER relay from the No. 3 relay block.

   2. Disconnect the A51 multiplex network front light ECU (front controller) connector.

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

      Standard voltage
      Tester Connection Condition Specified Condition DEICER relay terminal 2 - Body ground Always 11 to 14 V DEICER 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
      Tester Connection Condition Specified Condition DEICER relay terminal 1 - A51-13 (FDEF) Always Below 1 Ω DEICER relay terminal 1 - Body ground Always 10 kΩ or higher

   
   
   • OKClick here
   • NGClick here
7. Click here

   CHECK HARNESS AND CONNECTOR (DEICER RELAY - WINDSHIELD GLASS AND BODY GROUND)

   
   

   1. Remove the DEICER relay from the No. 3 relay block.

   2. Disconnect the A30 windshield glass connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition A30-1 (B2) - DEICER relay terminal 3 Always Below 1 Ω A30-2 (B) - DEICER relay terminal 3 Always Below 1 Ω A30-3 (E) - Body ground Always Below 1 Ω DEICER relay terminal 3 - Body ground Always 10 kΩ or higher

   
   
   • OKClick here
   • NGClick here
8. Click here

   INSPECT WINDSHIELD GLASS

   
   

   1. Inspect the windshield glass (Click here).

      Table 2. Result

      Result	Proceed to
      Windshield glass is broken	A
      Windshield glass is not broken	B

   
   
   • AClick here
   • BClick here
9. Click here

   CHECK MULTIPLEX NETWORK FRONT LIGHT ECU (FRONT CONTROLLER)

   
   

   1. Temporarily replace the multiplex network front light ECU (front controller) with a new or normally functioning one.

   2. Check that the malfunction disappears.

      OK
      Malfunction disappears.

   
   
   • OKClick here
   • NGClick here
10. Click here

    END (MULTIPLEX NETWORK FRONT LIGHT ECU [FRONT CONTROLLER] IS DEFECTIVE)

11. Click here

    END (AIR CONDITIONING AMPLIFIER IS DEFECTIVE)

12. Click here

    END (MULTI-MEDIA MODULE RECEIVER IS DEFECTIVE)

13. Click here

    REPLACE ACCESSORY METERClick here

14. Click here

    REPLACE DEICER RELAY

15. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

16. Click here

    REPLACE WINDSHIELD GLASSClick here

17. Click here

    REPLACE AIR CONDITIONING AMPLIFIERClick here