Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001FIZH
Model Year Start: 2019 Model: RAV4 Prod Date Range: [11/2018 - 02/2019]
Title: WINDOW / GLASS: WINDOW DEFOGGER SYSTEM: Rear Window Defogger System does not Operate; 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]

Rear Window Defogger System does not Operate

DESCRIPTION

When the window defogger switch on the air conditioning control assembly is pressed, the operation signal is transmitted to the air conditioning amplifier assembly via LIN communication. When the air conditioning amplifier assembly receives the signal, it turns on the defogger relay (DEF) to operate the window defogger system.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • If the auxiliary battery voltage becomes low, window defogger system operation is canceled to prioritize supplying power to the power steering system.

    Click here 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: DATA LIST / ACTIVE TEST

PROCEDURE

1.

CHECK AIR CONDITIONING SYSTEM

(a) Check the air conditioning system.

  • for HV Model:

    Click here 2019 MY RAV4 HV [11/2018 - 02/2019]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): HOW TO PROCEED WITH TROUBLESHOOTING

  • for Gasoline Model:

    Click here 2019 - 2024 MY RAV4 [11/2018 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING

HINT:

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

OK:

The air conditioning system operates normally.

Result

Proceed to

OK

A

NG (for HV Model)

B

NG (for Gasoline Model)

C
B

GO TO AIR CONDITIONING SYSTEM

C

GO TO AIR CONDITIONING SYSTEM

A

2.

CHECK AIR CONDITIONING CONTROL ASSEMBLY

(a) Check that the defogger indicator illuminates when the defogger switch is on.

OK:

Defogger indicator illuminates.

NG

REPLACE AIR CONDITIONING CONTROL ASSEMBLY

OK

3.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) Using the Techstream, perform the Active Test.

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; WINDOW / GLASS: WINDOW DEFOGGER SYSTEM: DATA LIST / ACTIVE TEST

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Defogger Relay (Rear)

Defogger relay (DEF)

OFF or ON

-

Body Electrical > Air Conditioner > Active Test

Tester Display

Defogger Relay (Rear)

OK:

Back door glass (defogger wire) warms up.

NG

GO TO STEP 5

OK

4.

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

(a) Replace the air conditioning amplifier assembly.

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING AMPLIFIER: REMOVAL

(b) Check that the window defogger system operates normally.

OK:

The window defogger system operates normally.

OK

END (AIR CONDITIONING AMPLIFIER ASSEMBLY IS DEFECTIVE)
NG

REPLACE AIR CONDITIONING CONTROL ASSEMBLY

5.

CHECK HARNESS AND CONNECTOR (BACK DOOR GLASS [DEFOGGER WIRE] - BATTERY)

(a) Disconnect the back door glass (defogger wire) connector.

*a

Front view of wire harness connector

(to Back Door Glass [Defogger Wire])

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

R2-1 (B) - Body ground

Ignition switch ON, window defogger switch on

11 to 14 V

Ignition switch ON, window defogger switch off

Below 1 V
NG

GO TO STEP 7

OK

6.

CHECK HARNESS AND CONNECTOR (BACK DOOR GLASS [DEFOGGER WIRE] - BODY GROUND)

(a) Disconnect the back door glass (defogger wire) connector.

*a

Front view of wire harness connector

(to Back Door Glass [Defogger Wire])

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

R22-1 (L) - Body ground

Always

Below 1 Ω
OK

REPAIR BACK DOOR GLASS (DEFOGGER WIRE)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

INSPECT DEFOGGER RELAY (DEF)

(a) Remove the defogger relay (DEF) from the No. 1 engine room relay block.

(b) Inspect the defogger relay (DEF).

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; WINDOW / GLASS: RELAY: ON-VEHICLE INSPECTION

NG

REPLACE DEFOGGER RELAY (DEF)
OK

8.

CHECK HARNESS AND CONNECTOR (DEFOGGER RELAY [DEF] - BATTERY)

(a) Remove the defogger relay (DEF) from the No. 1 engine room relay block.

*a

Front view of wire harness connector

(to Defogger Relay [DEF])

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

Defogger relay (DEF) terminal 2 - Body ground

Ignition switch ON

11 to 14 V

Defogger relay (DEF) terminal 5 - Body ground

Ignition switch off

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

CHECK HARNESS AND CONNECTOR (DEFOGGER RELAY [DEF] - AIR CONDITIONING AMPLIFIER ASSEMBLY AND BACK DOOR GLASS [DEFOGGER WIRE])

(a) Remove the defogger relay (DEF) from the No. 1 engine room relay block.

(b) Disconnect the G47 air conditioning amplifier assembly connector.

(c) Disconnect the N2 radio setting condenser (noise filter) connector.

(d) Disconnect the R2 back door glass (defogger wire) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Defogger relay (DEF) terminal 1 - G47-18 (RDFG)

Always

Below 1 Ω

Defogger relay (DEF) terminal 3 - R2-1 (B)

Always

Below 1 Ω

Defogger relay (DEF) terminal 1 or G47-18 (RDFG) - Body ground

Always

10 kΩ or higher

Defogger relay (DEF) terminal 3 or R2-1 (B) - Body ground

Always

10 kΩ or higher
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR