LIGHTING (EXT): LIGHTING SYSTEM (w/o Headlight ECU): LO-beam Headlight does not Illuminate; 2019 - 2021 MY RAV4 RAV4 HV [02/2019

Last Modified: 01-30-2024	6.11:8.1.0	Doc ID: RM100000001H55H
Model Year Start: 2019	Model: RAV4	Prod Date Range: [02/2019 - 12/2021]
Title: LIGHTING (EXT): LIGHTING SYSTEM (w/o Headlight ECU): LO-beam Headlight does not Illuminate; 2019 - 2021 MY RAV4 RAV4 HV [02/2019 - 12/2021]

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.

(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

USE SIMULATION METHOD TO CHECK

GO TO STEP 9

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)

GO TO STEP 4

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 (for TMC Made)

REPLACE HEADLIGHT UNIT ASSEMBLY LH

for Triple Beam Headlight:

Click here

for Single Beam Headlight:

Click here

OK (for TMMC Made)

REPLACE HEADLIGHT UNIT ASSEMBLY LH

for Triple Beam Headlight:

Click here

for Single Beam Headlight:

Click here

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

REPLACE H-LP LH RELAY

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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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	Switch Condition	Specified Condition
2 (H-LP LH relay) - Body ground	Ignition switch off	11 to 14 V
5 (H-LP LH relay) - Body ground	Ignition switch off	11 to 14 V

*a	Front view of wire harness connector (to H-LP LH Relay)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Component without harness connected

(Instrument Panel Junction Block Assembly)

(a) Remove the instrument panel junction block assembly.

Click here

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4F-31 - A-15 (HRLY)	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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)

GO TO STEP 11

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 (for TMC Made)

REPLACE HEADLIGHT UNIT ASSEMBLY RH

for Triple Beam Headlight:

Click here

for Single Beam Headlight:

Click here

OK (for TMMC Made)

REPLACE HEADLIGHT UNIT ASSEMBLY RH

for Triple Beam Headlight:

Click here

for Single Beam Headlight:

Click here

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

REPLACE H-LP RH RELAY

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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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	Switch Condition	Specified Condition
2 (H-LP RH relay) - Body ground	Ignition switch off	11 to 14 V
5 (H-LP RH relay) - Body ground	Ignition switch off	11 to 14 V

*a	Front view of wire harness connector (to H-LP RH Relay)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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.

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

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR