LIGHTING (EXT): LIGHTING SYSTEM (w/o Headlight ECU): B2430,B2431; LED Headlight LH; 2019 - 2021 MY RAV4 RAV4 HV [02/2019

Last Modified: 01-30-2024	6.11:8.1.0	Doc ID: RM100000001H55A
Model Year Start: 2019	Model: RAV4	Prod Date Range: [02/2019 - 12/2021]
Title: LIGHTING (EXT): LIGHTING SYSTEM (w/o Headlight ECU): B2430,B2431; LED Headlight LH; 2019 - 2021 MY RAV4 RAV4 HV [02/2019 - 12/2021]

DTC

B2430

LED Headlight LH

DTC

B2431

LED Headlight RH

DESCRIPTION

These DTCs are stored when the low beam headlights do not illuminate, or a communication malfunction is detected between the light control LED ECU and main body ECU (multiplex network body ECU).

HINT:

DTC B2430 or DTC B2431 may also be stored if a headlight cooling fan is malfunctioning. In this case, the light control LED ECU will dim or turn off the malfunctioning low beam headlight.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from
B2430	LED Headlight LH	Detection condition: All of the following conditions are met: Ignition switch ON (READY) Low beam headlights on Malfunction Status: Any of the following conditions is met: Headlight unit assembly LH malfunction Headlight unit assembly LH power source and signal malfunction Malfunction Time: 10 seconds or more	Headlight unit assembly LH H-LP LH relay Instrument panel junction block assembly Main body ECU (multiplex network body ECU) Harness or connector	Main Body
B2431	LED Headlight RH	Detection condition: All of the following conditions are met: Ignition switch ON (READY) Low beam headlights on Malfunction Status: Any of the following conditions is met: Headlight unit assembly RH malfunction Headlight unit assembly RH power source and signal malfunction Malfunction Time: 10 seconds or more	Headlight unit assembly RH H-LP RH relay Main body ECU (multiplex network body ECU) Harness or connector	Main Body

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

PROCEDURE

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Main Body / Clear DTCs.

(e) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

2.	CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON (READY).

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Main Body / Trouble Codes.

(f) Check for DTCs.

Body Electrical > Main Body > Trouble Codes

OK:

DTC B2430 and B2431 are not output.

Result	Proceed to
OK	A
NG (DTC B2430 is output)	B
NG (DTC B2431 is output)	C

USE SIMULATION METHOD TO CHECK

GO TO STEP 12

3.	CHECK HEADLIGHT UNIT ASSEMBLY LH (LO TERMINAL VOLTAGE)

(a) Disconnect the headlight unit assembly LH connector.

*a	Front view of wire harness connector (to Headlight Unit Assembly LH)

(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

GO TO STEP 7

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

(a) Disconnect the headlight unit assembly LH connector.

*a	Front view of wire harness connector (to Headlight Unit Assembly LH)

(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

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HEADLIGHT UNIT ASSEMBLY LH (S TERMINAL VOLTAGE)

(a) Disconnect the headlight unit assembly LH connector.

*a	Front view of wire harness connector (to Headlight Unit Assembly LH)

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
A62-6 (S) - Body ground	Ignition switch ON	11 to 14 V

REPLACE HEADLIGHT UNIT ASSEMBLY LH

6.	CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT ASSEMBLY LH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

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

(b) Disconnect the G43 main body ECU (multiplex network body ECU) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A62-6 (S) - G43-14 (LLEW)	Always	Below 1 Ω
A62-6 (S) or G43-14 (LLEW) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	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

8.	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

9.	CHECK HARNESS AND CONNECTOR (POWER SOURCE - H-LP LH RELAY)

(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

10.	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

11.	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

12.	CHECK HEADLIGHT UNIT ASSEMBLY RH (LO TERMINAL VOLTAGE)

(a) Disconnect the headlight unit assembly RH connector.

*a	Front view of wire harness connector (to Headlight Unit Assembly RH)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A61-1 (LO) - Body ground	Light control switch in HEAD position	11 to 14 V

GO TO STEP 16

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

(a) Disconnect the headlight unit assembly RH connector.

*a	Front view of wire harness connector (to Headlight Unit Assembly RH)

(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

REPAIR OR REPLACE HARNESS OR CONNECTOR

14.	INSPECT HEADLIGHT UNIT ASSEMBLY RH (S TERMINAL VOLTAGE)

(a) Disconnect the headlight unit assembly RH connector.

*a	Front view of wire harness connector (to Headlight Unit Assembly RH)

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
A61-6 (S) - Body ground	Ignition switch ON	11 to 14 V

REPLACE HEADLIGHT UNIT ASSEMBLY RH

15.	CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT ASSEMBLY RH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

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

(b) Disconnect the G43 main body ECU (multiplex network body ECU) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A61-6 (S) - G43-15 (RLEW)	Always	Below 1 Ω
A61-6 (S) or G43-15 (RLEW) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

16.	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

17.	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

18.	CHECK HARNESS AND CONNECTOR (POWER SOURCE - H-LP RH RELAY)

(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

19.	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

DESCRIPTION

Detection condition:

Malfunction Status:

Malfunction Time:

Detection condition:

Malfunction Status:

Malfunction Time:

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

Body Electrical > Main Body > Clear DTCs

Body Electrical > Main Body > Trouble Codes