Windshield Deicer Does Not Operate

WINDSHIELD / WINDOW GLASS: WINDSHIELD DEICER SYSTEM: Windshield Deicer does not Operate
- Windshield Deicer does not Operate

DESCRIPTION

When the windshield deicer switch is turned ON, a front window deicer activation request signal from the air conditioning amplifier is sent via the CAN line to the front controller. Then the front controller operates the windshield deicer.

HINT
This circuit uses the CAN communication line. Before performing the inspection, check that the CAN communication system is functioning normally.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK POWER SWITCH (SWITCH CONDITION)

(a) Ensure the key is inside the cabin.

(b) With the brake pedal released, check that the power source mode changes as shown below each time the power switch is pushed.

OK:

OFF -> ON (ACC) -> ON (IG) -> OFF

NG -- GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (POWER SOURCE MODE DOES NOT CHANGE) Power Source Mode does not Change
OK -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM (DEICER RELAY)

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

NOTICE:
When the Body No.5 (front controller) related vehicle switch is ON, Active Test items related to the vehicle switch are prohibited (double operation prohibition). Check that the vehicle switches are OFF before performing Active Test.

Body No.5:





OK:

Windshield deicer operates normally.

NG -- INSPECT FUSE (DEICER)
OK -- Continue to next step.

3. CHECK DISPLAY AND NAVIGATION MODULE DISPLAY (OPERATION)

(a) Temporarily replace the display and navigation module display with a new or normally functioning one.

w/ Navigation System (for HDD) Removal

w/ Navigation System (for DVD) Removal

(b) Check that the malfunction disappears.

OK:

Malfunction disappears.

Result





C -- REPLACE AIR CONDITIONING AMPLIFIER Removal

B -- END (DISPLAY AND NAVIGATION MODULE DISPLAY IS DEFECTIVE)

A -- END (DISPLAY AND NAVIGATION MODULE DISPLAY IS DEFECTIVE)

4. INSPECT FUSE (DEICER)

(a) Remove the DEICER fuse from the engine room No. 2 relay block.

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

Standard resistance:





NG -- REPLACE FUSE
OK -- Continue to next step.

5. INSPECT DEICER RELAY





(a) Remove the deicer relay from the No. 3 relay block.

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

Standard resistance:





NG -- REPLACE DEICER RELAY
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (DEICER RELAY - FRONT CONTROLLER AND BATTERY)





(a) Remove the DEICER relay from the No. 3 relay block.

(b) Disconnect the A51 front controller connector.

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

Standard voltage:





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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

7. CHECK HARNESS AND CONNECTOR (DEICER RELAY - WINDSHIELD DEICER WIRE)





(a) Remove the DEICER relay from the No. 3 relay block.

(b) Disconnect the A30 windshield deicer wire connector.

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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

8. CHECK HARNESS AND CONNECTOR (WINDSHIELD DEICER WIRE - BODY GROUND)





(a) Disconnect the A30 windshield deicer wire connector.

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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

9. CHECK FRONT CONTROLLER (OPERATION)

(a) Temporarily replace the front controller with a new or normally functioning one.

(b) Check that the malfunction disappears.

OK:

Malfunction disappears.

NG -- REPLACE AIR CONDITIONING AMPLIFIER Removal

OK -- END (FRONT CONTROLLER IS DEFECTIVE)