Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001F3TY
Model Year Start: 2019 Model: RAV4 Prod Date Range: [11/2018 - 02/2019]
Title: LIGHTING (EXT): LIGHTING SYSTEM (w/o Headlight ECU): Front Fog Light Circuit; 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]

Front Fog Light Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the front fog lights.

WIRING DIAGRAM

for Bulb Type:

for LED Type:

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses and bulbs for circuits related to this system before performing the following procedure.
  • w/ Smart Key System:

    Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM

(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 / Main Body / Active Test.

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

Body Electrical > Main Body > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Front Fog Light Relay

Front fog light relay

OFF or ON

Light control switch in TAIL position

Body Electrical > Main Body > Active Test

Tester Display

Front Fog Light Relay

OK:

Front fog light relay operates. (Front fog lights come on.)

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

CHECK HARNESS AND CONNECTOR (FOG FR RELAY - BATTERY)

(a) Remove the FOG FR relay.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

5 (FOG FR relay) - Body ground

Always

11 to 14 V

*a

Front view of wire harness connector

(to FOG FR Relay)
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

CHECK HARNESS AND CONNECTOR (FOG FR RELAY INPUT VOLTAGE)

(a) Remove the FOG FR relay.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

2 (FOG FR relay) - Body ground

Light control switch in TAIL or HEAD position

11 to 14 V

*a

Front view of wire harness connector

(to FOG FR Relay)
NG

GO TO STEP 8

OK

4.

INSPECT FOG FR RELAY

(a) Remove the FOG FR relay.

(b) Inspect the FOG FR relay.

Click here 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]; LIGHTING (EXT): RELAY: ON-VEHICLE INSPECTION

NG

REPLACE FOG FR RELAY
OK

5.

CHECK HARNESS AND CONNECTOR (FOG FR RELAY - FOG LIGHT ASSEMBLY)

(a) Remove the FOG FR relay.

(b) Disconnect the B11 fog light assembly LH connector.

(c) Disconnect the B10 fog light assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 (FOG FR relay) - B10-2 (B)

Always

Below 1 Ω

3 (FOG FR relay) - B11-2 (B)

Always

Below 1 Ω

3 (FOG FR relay) or B10-2 (B) - Body ground

Always

10 kΩ or higher

3 (FOG FR relay) or B11-2 (B) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

CHECK HARNESS AND CONNECTOR (FOG FR RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Remove the FOG FR relay.

(b) Disconnect the 4A instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (FOG FR relay) - 4A-52

Always

Below 1 Ω

1 (FOG FR relay) or 4A-52 - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

*a

Component without harness connected

(Instrument Panel Junction Block Assembly)

-

-

(a) Remove the instrument panel junction block assembly.

Click here 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

(b) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4A-52 - A-7 (FFGO)

Always

Below 1 Ω
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

8.

CHECK HARNESS AND CONNECTOR (FOG FR RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Remove the FOG FR relay.

(b) Disconnect the 4F instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2 (FOG FR relay) - 4F-32

Always

Below 1 Ω

2 (FOG FR relay) or 4F-32 - Body ground

Always

10 kΩ or higher
OK

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR