Last Modified: 02-14-2025 6.11:8.1.0 Doc ID: RM100000002PXZJ
Model Year Start: 2024 Model: RAV4 Prod Date Range: [10/2023 - 11/2024]
Title: LIGHTING (EXT): LIGHTING SYSTEM: Taillight Relay Circuit; 2024 MY RAV4 RAV4 HV [10/2023 - 11/2024]

Taillight Relay Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the operation of the TAIL relay.

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
B

GO TO STEP 3

A

2.

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

Taillight / Clearance Light

Taillight relay

OFF or ON

-

Body Electrical > Main Body > Active Test

Tester Display

Taillight / Clearance Light

OK:

Taillights illuminate.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

GO TO STEP 4

3.

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

Taillight Relay

Taillight relay

OFF or ON

-

Body Electrical > Main Body > Active Test

Tester Display

Taillight Relay

OK:

Taillights illuminate.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

4.

CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BATTERY)

(a) Disconnect the instrument panel junction block assembly connector.

*a

Front view of wire harness connector

(to Instrument Panel Junction Block Assembly)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

4K-1 - Body ground

Ignition switch off

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

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 2024 - 2025 MY RAV4 RAV4 HV [10/2023 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

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

(c) Connect a positive (+) lead from the auxiliary battery to terminal 4K-1.

(d) Connect a negative (-) lead from the auxiliary battery to terminal A-14 (TRLY).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

4F-32 - Auxiliary battery negative (-) terminal

Auxiliary battery voltage is applied between terminals 4K-1 - A-14 (TRLY)

11 to 14 V

4H-30 - Auxiliary battery negative (-) terminal

Auxiliary battery voltage is applied between terminals 4K-1 - A-14 (TRLY)

11 to 14 V
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY