LIGHTING (EXT): LIGHTING SYSTEM: LO-beam Headlight does not Illuminate; 2024 MY RAV4 RAV4 HV [10/2023

Last Modified: 02-14-2025	6.11:8.1.0	Doc ID: RM100000002PXZL
Model Year Start: 2024	Model: RAV4	Prod Date Range: [10/2023 - 11/2024]
Title: LIGHTING (EXT): LIGHTING SYSTEM: LO-beam Headlight does not Illuminate; 2024 MY RAV4 RAV4 HV [10/2023 - 11/2024]

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.	CONFIRM MODEL

(a) Choose the model to be inspected.

Result	Proceed to
Type A	A
Type B	B

GO TO STEP 3

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 / 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 / Light Power Supply Relay	Low beam headlights	OFF or ON	-

Body Electrical > Main Body > Active Test

Tester Display
Headlight Relay / Light Power Supply 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 4

GO TO STEP 11

3.	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 11

4.	INSPECT HEADLIGHT ASSEMBLY LH (LO TERMINAL VOLTAGE)

(a) Disconnect the headlight 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 Assembly LH)

GO TO STEP 6

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

(a) Disconnect the headlight 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 Assembly LH)

OK (for TMC Made)

REPLACE HEADLIGHT ASSEMBLY LH

OK (for TMMC Made)

REPLACE HEADLIGHT ASSEMBLY LH

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	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

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

(a) Remove the H-LP LH relay.

(b) Disconnect the A62 headlight 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

8.	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

9.	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

10.	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

11.	INSPECT HEADLIGHT ASSEMBLY RH (LO TERMINAL VOLTAGE)

(a) Disconnect the headlight 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 Assembly RH)

GO TO STEP 13

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

(a) Disconnect the headlight 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 Assembly RH)

OK (for TMC Made)

REPLACE HEADLIGHT ASSEMBLY RH

OK (for TMMC Made)

REPLACE HEADLIGHT ASSEMBLY RH

REPAIR OR REPLACE HARNESS OR CONNECTOR

13.	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

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

(a) Remove the H-LP RH relay.

(b) Disconnect the A61 headlight 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

15.	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

16.	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