Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001F59W
Model Year Start: 2019 Model: RAV4 Prod Date Range: [11/2018 - 02/2019]
Title: LIGHTING (EXT): LIGHTING SYSTEM (w/o Headlight ECU): LO-beam Headlight does not Illuminate; 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]

LO-beam Headlight does not Illuminate

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the low beam headlights.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses 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

Headlight Relay

Low beam headlights

OFF or ON

-

Body Electrical > Main Body > Active Test

Tester Display

Headlight Relay

OK:

Low beam headlights illuminate.

Result

Proceed to

OK

A

NG (for LH Side)

B

NG (for RH Side)

C
A

USE SIMULATION METHOD TO CHECK

C

GO TO STEP 9

B

2.

INSPECT HEADLIGHT UNIT ASSEMBLY LH (LO TERMINAL VOLTAGE)

(a) Disconnect the headlight unit assembly LH connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A62-1 (LO) - Body ground

Light control switch in HEAD position

11 to 14 V

*a

Front view of wire harness connector

(to Headlight Unit Assembly LH)
NG

GO TO STEP 4

OK

3.

CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT ASSEMBLY LH - BODY GROUND)

(a) Disconnect the headlight unit assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A62-2 (E) - Body ground

Always

Below 1 Ω

*a

Front view of wire harness connector

(to Headlight Unit Assembly LH)
OK

REPLACE HEADLIGHT UNIT ASSEMBLY LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.

INSPECT H-LP LH RELAY

(a) Remove the H-LP LH relay.

(b) Inspect the H-LP LH relay.

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

NG

REPLACE H-LP LH RELAY
OK

5.

CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - HEADLIGHT UNIT ASSEMBLY LH)

(a) Remove the H-LP LH relay.

(b) Disconnect the A62 headlight unit assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 (H-LP LH relay) - A62-1 (LO)

Always

Below 1 Ω

3 (H-LP LH relay) or A62-1 (LO) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - BATTERY)

(a) Remove the H-LP LH relay.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

2 (H-LP LH relay) - Body ground

Always

11 to 14 V

5 (H-LP LH relay) - Body ground

Always

11 to 14 V

*a

Front view of wire harness connector

(to H-LP LH Relay)
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Remove the H-LP LH 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

1 (H-LP LH relay) - 4F-31

Always

Below 1 Ω

1 (H-LP LH relay) or 4F-31 - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

8.

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

4F-31 - A-15 (HRLY)

Always

Below 1 Ω
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

9.

INSPECT HEADLIGHT UNIT ASSEMBLY RH (LO TERMINAL VOLTAGE)

(a) Disconnect the headlight unit assembly RH connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A61-1 (LO) - Body ground

Light control switch in HEAD position

11 to 14 V

*a

Front view of wire harness connector

(to Headlight Unit Assembly RH)
NG

GO TO STEP 11

OK

10.

CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT ASSEMBLY RH - BODY GROUND)

(a) Disconnect the headlight unit assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A61-2 (E) - Body ground

Always

Below 1 Ω

*a

Front view of wire harness connector

(to Headlight Unit Assembly RH)
OK

REPLACE HEADLIGHT UNIT ASSEMBLY RH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

11.

INSPECT H-LP RH RELAY

(a) Remove the H-LP RH relay.

(b) Inspect the H-LP RH relay.

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

NG

REPLACE H-LP RH RELAY
OK

12.

CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - HEADLIGHT UNIT ASSEMBLY RH)

(a) Remove the H-LP RH relay.

(b) Disconnect the A61 headlight unit assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 (H-LP RH relay) - A61-1 (LO)

Always

Below 1 Ω

3 (H-LP RH relay) or A61-1 (LO) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

13.

CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - BATTERY)

(a) Remove the H-LP RH relay.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

2 (H-LP RH relay) - Body ground

Always

11 to 14 V

5 (H-LP RH relay) - Body ground

Always

11 to 14 V

*a

Front view of wire harness connector

(to H-LP RH Relay)
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

14.

CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Remove the H-LP RH relay.

(b) Disconnect the G44 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (H-LP RH relay) - G44-12 (HRY2)

Always

Below 1 Ω

1 (H-LP RH relay) or G44-12 (HRY2) - Body ground

Always

10 kΩ or higher
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR