Windshield Deicer Does Not Operate

WINDOW / GLASS: 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

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (DEICER RELAY)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test / Deicer Relay (Front)
(e) Check that the deicer operation.

Air Conditioner

OK:
Deicer operates on and off.
NG -- INSPECT FUSE (DEICER)
OK -- Continue to next step.
2. CHECK AIR CONDITIONING SYSTEM (LIN COMMUNICATION)
(a) Operate the integration control and panel to change the set temperature and check that the temperature at the outlets changes.
OK:
The outlet temperature changes in accordance with the operation of the control panel
NG -- GO TO AIR CONDITIONING CONTROL CIRCUIT
OK -- Continue to next step.
3. REPLACE INTEGRATION CONTROL AND PANEL
(a) Temporarily replace the integration control and panel with a new or normally functioning one Removal.
NEXT -- Continue to next step.
4. CHECK INTEGRATION CONTROL AND PANEL (OPERATION)
(a) Check that the malfunction disappears.
OK:
Malfunction disappears.
NG -- REPLACE AIR CONDITIONING AMPLIFIER
OK -- END (INTEGRATION CONTROL AND PANEL IS DEFECTIVE)
5. 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:

(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:

(c) Reinstall the DEICER relay.
NG -- REPLACE DEICER RELAY
OK -- Continue to next step.
7. 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 H24 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:

(e) Reconnect the air conditioning amplifier connector.
(f) Reinstall the deicer relay.
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 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:

(d) Reconnect the A25 windshield deicer wire connector.
(e) Reinstall the deicer relay.
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 A25 windshield deicer wire connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

(c) Reconnect the windshield deicer wire connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
10. CHECK WINDSHIELD DEICER WIRE (SYSTEM VOLTAGE)

(a) Disconnect the A25 windshield deicer wire connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:

(c) Reconnect the windshield deicer wire connector.
NG -- REPLACE AIR CONDITIONING AMPLIFIER
OK -- REPLACE WINDSHIELD GLASS