Toyota Venza: Rear Window Defogger System does not Operate

Toyota Venza Service Manual / Window / Glass / Window Defogger System / Rear Window Defogger System 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 RR DEF relay to operate the rear window defogger.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.	CHECK AIR CONDITIONING SYSTEM

(a) Check the air conditioning system.

HINT:

Both the window defogger system operation signal and air conditioning system operation signal are transmitted to the air conditioning amplifier assembly through the same LIN communication line.

Result

Result	Proceed to
The air conditioning system operates normally.	A
The air conditioning system does not operate normally.	B

GO TO AIR CONDITIONING SYSTEM

2.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Air Conditioner

Tester Display	Test Part	Control Range	Diagnostic Note
Defogger Relay (Rear)	Rear window defogger	OFF or ON	-

OK:

The window defogger system operates normally.

REPLACE AIR CONDITIONING CONTROL ASSEMBLY

3.	INSPECT RR DEF RELAY

(a) Remove the RR DEF 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 - 4	Battery voltage applied between terminals 1 and 2	10 kΩ or higher
3 - 4	Battery voltage not applied between terminals 1 and 2	Below 1 Ω
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 RR DEF RELAY

4.	CHECK HARNESS AND CONNECTOR (DEF 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 RR DEF relay terminal 1 - Body ground	Ignition switch off	Below 1 V
Engine room relay block RR DEF relay terminal 1 - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*1	Engine Room Relay Block
*2	RR DEF Relay Terminal

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (RR DEF 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 RR DEF 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

RR DEF Relay Terminal

Front view of wire harness connector

(to Air Conditioning Amplifier Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

(a) Install the RR DEF relay to the engine room relay block.

(b) Reconnect the D47 air conditioning amplifier assembly connector.

Standard Voltage:

Tester Connection	Condition	Specified Condition
D47-18 (D) - D47-14 (GND)	Ignition switch ON, rear window defogger switch off	11 to 14 V
D47-18 (D) - D47-14 (GND)	Ignition switch ON, rear window defogger switch on	Below 1 V

Text in Illustration

*1	Component with harness connected (Air Conditioning Amplifier Assembly)

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

7.	CHECK HARNESS AND CONNECTOR (RR DEF RELAY POWER SOURCE)

(a) Remove the RR DEF relay from the engine room relay block.

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

Standard Voltage:

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

Text in Illustration

*1	Engine Room Relay Block
*2	RR DEF Relay Terminal

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	CHECK HARNESS AND CONNECTOR (RR DEF RELAY - RADIO SETTING CONDENSER)

(a) Disconnect the R7 radio setting condenser connectors.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R7-2 (DEF) - Engine room relay block RR DEF relay terminal 3	Always	Below 1 Ω
R7-2 (DEF) - Body ground	Always	10 kΩ or higher
Engine room relay block RR DEF relay terminal 3 - Body ground	Always	10 kΩ or higher

Text in Illustration

Engine Room Relay Block

RR DEF Relay Terminal

Front view of wire harness connector

(to Radio Setting Condenser)

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.	CHECK HARNESS AND CONNECTOR (RADIO SETTING CONDENSER - REAR WINDOW DEFOGGER)

(a) Disconnect the R16 rear window defogger connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R7-1 (DEFB) - R16-1 (B)	Always	Below 1 Ω
R7-1 (DEFB) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.	INSPECT BACK DOOR GLASS (REAR WINDOW DEFOGGER WIRE)

(a) Disconnect the R15 rear window defogger connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 - 1	Always	Below 1 Ω

Text in Illustration

Component without harness connected

(Back Door Glass (Rear Window Defogger Wire))

Battery Side

Body Ground Side

REPLACE BACK DOOR GLASS (REAR WINDOW DEFOGGER WIRE)

11.	CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER - BODY GROUND)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R15-1 - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.	REPLACE RADIO SETTING CONDENSER

(a) Replace the radio setting condenser.

13.	CHECK REAR 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 ).

Result	Proceed to
The window defogger system operates normally	A
The window defogger system operate does not normally	B

END

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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