Windshield Deicer Does Not Operate
WINDSHIELD / WINDOWGLASS: WINDSHIELD DEICER SYSTEM: Windshield Deicer does not Operate
- Windshield Deicer does not Operate
DESCRIPTION
When the windshield deicer switch turns ON, a front window deicer activation request signal from the air conditioning amplifier is sent via the CAN line to the front light ECU. Then the front light ECU 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 OPERATION (ENGINE START)
(a) Check that the engine starts normally.
OK:
Engine starts normally.
NG -- GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START Initial Inspection and Diagnostic Overview
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.
Air Conditioner
Result
C -- INSPECT FUSE (DEICER)
B -- CHECK INTEGRATION CONTROL AND PANEL (OPERATION)
A -- 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 Removal.
(b) Check that the malfunction disappears.
OK:
Malfunction disappears.
Result
D -- REPLACE AIR CONDITIONING AMPLIFIER Removal
C -- REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Removal
B -- REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Removal
A -- REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Removal
4. CHECK INTEGRATION CONTROL AND PANEL (OPERATION)
(a) Temporarily replace the integration control and panel with a new or normally functioning one Removal.
(b) Check that the malfunction disappears.
OK:
Malfunction disappears.
NG -- REPLACE AIR CONDITIONING AMPLIFIER Removal
OK -- REPLACE INTEGRATION CONTROL AND PANEL Removal
5. INSPECT FUSE (DEICER)
(a) Remove the DEICER fuse from the engine room No. 2 relay block.
(b) Measure the resistance of the fuse.
Standard resistance:
NG -- REPLACE FUSE
OK -- Continue to next step.
6. 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.
7. CHECK HARNESS AND CONNECTOR (DEICER RELAY - FRONT LIGHT ECU AND BATTERY)
(a) Remove the deicer relay from the No. 3 relay block.
(b) Disconnect the A51 front light ECU 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.
8. 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.
9. 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.
10. CHECK FRONT LIGHT ECU (OPERATION)
(a) Temporarily replace the front light ECU with a new or normally functioning one.
(b) Check that the malfunction disappears.
OK:
Malfunction disappears.
NG -- REPLACE AIR CONDITIONING AMPLIFIER Removal
OK -- REPLACE FRONT LIGHT ECU