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 is turned ON, a windshield deicer activation request signal is sent via the LIN communication line to the air conditioning amplifier. Then the air conditioning amplifier operates the windshield deicer.

WIRING DIAGRAM





INSPECTION PROCEDURE
HINT: This circuit uses the LIN communication line. Before performing the inspection, check that the LIN communication system is functioning normally Initial Inspection and Diagnostic Overview.

PROCEDURE

1. 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





OK:
Deicer relay turns ON and OFF.
NG -- INSPECT FUSE (DEICER)
OK -- Continue to next step.
2. CHECK INTEGRATION CONTROL AND PANEL (OPERATION)
(a) Temporarily replace the integration control and panel with a new or normally functioning one.
(1) For Column Shift Type, refer to the following procedures Removal.
(2) For Floor Shift Type, refer to the following procedures Removal.
(b) Check that the malfunction disappears.
OK:
Malfunction disappears.
NG -- REPLACE AIR CONDITIONING AMPLIFIER
OK -- END (INTEGRATION CONTROL AND PANEL IS DEFECTIVE)
3. INSPECT FUSE (DEICER)
(a) Remove the DEICER fuse from the engine room 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.
4. INSPECT DEICER RELAY




(a) Remove the DEICER relay from the engine room 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.
5. CHECK HARNESS AND CONNECTOR (DEICER RELAY - AIR CONDITIONING AMPLIFIER AND BATTERY)




(a) Remove the DEICER relay from the engine room relay block.
(b) Disconnect the J19 air conditioning amplifier 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.
6. CHECK HARNESS AND CONNECTOR (DEICER RELAY - WINDSHIELD DEICER WIRE)




(a) Remove the DEICER relay from the engine room relay block.
(b) Disconnect the A23 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.
7. CHECK HARNESS AND CONNECTOR (WINDSHIELD DEICER WIRE - BODY GROUND)




(a) Disconnect the A23 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.
8. CHECK WINDSHIELD DEICER WIRE




(a) Disconnect the A23 windshield deicer wire connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPLACE AIR CONDITIONING AMPLIFIER
OK -- REPLACE WINDSHIELD GLASS