Toyota Venza: Windshield Deicer does not Operate

Toyota Venza Service Manual / Window / Glass / Windshield Deicer System / Windshield Deicer does not Operate

DESCRIPTION

When the rear window defogger switch on the air conditioning control assembly is pressed, the operation signal is transmitted to the air conditioning amplifier assembly through the LIN communication line. When the air conditioning amplifier assembly receives the signal, it turns on the DEICER relay to operate the windshield deicer.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.	CHECK WINDOW DEFOGGER SYSTEM

(a) Turn the ignition switch to ON, press the rear window defogger switch, and check that the window defogger operates (See page ).

OK:

The window defogger system operates normally.

GO TO WINDOW DEFOGGER SYSTEM

2.	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:

Tester Connection	Condition	Specified Condition
3 - 5	Battery voltage applied between terminals 1 and 2	Below 1 Ω
3 - 5	Battery voltage not applied between terminals 1 and 2	10 kΩ or higher

REPLACE DEICER RELAY

3.	CHECK HARNESS AND CONNECTOR (DEICER RELAY POWER SOURCE)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
Engine room relay block DEICER relay terminal 2 - Body ground	Ignition switch off	Below 1 V
Engine room relay block DEICER relay terminal 2 - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*1	Engine Room Relay Block
*2	DEICER Relay Terminal

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (DEICER RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the D47 air conditioning amplifier assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Engine room relay block DEICER relay terminal 1 - D47-18 (D)	Always	Below 1 Ω
D47-14 (GND) - Body ground	Always	Below 1 Ω
D47-18 (D) - Body ground	Always	10 kΩ or higher

Text in Illustration

Engine Room Relay Block

DEICER Relay Terminal

Front view of wire harness connector

(to Air Conditioning Amplifier Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (DEICER RELAY POWER SOURCE)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
Engine room relay block DEICER relay terminal 5 - Body ground	Always	11 to 14 V

Text in Illustration

*1	Engine Room Relay Block
*2	DEICER Relay Terminal

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Disconnect the A3 windshield deicer wire connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A3-1 (B) - engine room relay block DEICER relay terminal 3	Always	Below 1 Ω
A3-1 (B) - Body ground	Always	10 kΩ or higher
Engine room relay block DEICER relay terminal 3 - Body ground	Always	10 kΩ or higher

Text in Illustration

Engine Room Relay Block

DEICER Relay Terminal

Front view of wire harness connector

(to Windshield Deicer Wire)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A3-2 (E) - Body ground	Always	Below 1 Ω

Text in Illustration

*1	Front view of wire harness connector (to Windshield Deicer Wire)

REPLACE WINDSHIELD GLASS (WINDSHIELD DEICER WIRE)

REPAIR OR REPLACE HARNESS OR CONNECTOR

Terminals Of Ecu

TERMINALS OF ECU 1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (a) Disconnect the D47 air conditioning amplifier assembly connector. (b) Measure the voltage and resistance according to the value(s ...

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