Toyota Venza manuals

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.


NG

GO TO WINDOW DEFOGGER SYSTEM


OK

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


NG

REPLACE DEICER RELAY


OK

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



NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

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

*1

Engine Room Relay Block

*2

DEICER Relay Terminal

*3

Front view of wire harness connector

(to Air Conditioning Amplifier Assembly)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

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



NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

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

*1

Engine Room Relay Block

*2

DEICER Relay Terminal

*3

Front view of wire harness connector

(to Windshield Deicer Wire)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

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)



OK

REPLACE WINDSHIELD GLASS (WINDSHIELD DEICER WIRE)


NG

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 ...

Windshield Glass
...

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