Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VJF9
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 11/2017]
Title: NETWORKING: LIN COMMUNICATION SYSTEM: B2432; Lost Communication with Automatic High Beam Sensor; 2016 - 2017 MY Sienna [12/2015 - 11/2017]

DTC

B2432

Lost Communication with Automatic High Beam Sensor

DESCRIPTION

The DTC is stored when the AFS ECU (headlight swivel computer assembly) detects malfunctions in the LIN communication system.

DTC Code

DTC Detection Condition

Trouble Area

B2432

Malfunction in LIN communication system
  • Inner rear view mirror assembly
  • Harness or connector
  • AFS ECU (headlight swivel computer assembly)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs (See page 2016 - 2020 MY Sienna [12/2015 -        ]; NETWORKING: LIN COMMUNICATION SYSTEM: DTC CHECK / CLEAR ).

NEXT

2.

CHECK FOR DTC

(a) Check for DTCs (See page 2016 - 2020 MY Sienna [12/2015 -        ]; NETWORKING: LIN COMMUNICATION SYSTEM: DTC CHECK / CLEAR ).

Result

Result

Proceed to

DTC B2432 is output

A

DTC B2432 and B124D are output

B

No DTCs output

C

HINT:

When both B2432 and B124D are output at the same time, troubleshoot B124D first.

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

C

USE SIMULATION METHOD TO CHECK

A

3.

CHECK HARNESS AND CONNECTOR (AFS ECU (HEADLIGHT SWIVEL COMPUTER ASSEMBLY) - INNER REAR VIEW MIRROR ASSEMBLY)

(a) Disconnect the A45 AFS ECU (headlight swivel computer assembly) connector

(b) Disconnect the T2 inner rear view mirror assembly connector.

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

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

A45-10 (SMR) - T2-12 (LIN)

Always

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

T2-12 (LIN) - Body ground

Always

10 kΩ or higher

Text in Illustration

*a

Front view of wire harness connector

(to AFS ECU (Headlight Swivel Computer Assembly))

*b

Front view of wire harness connector

(to Inner Rear View Mirror Assembly)
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

INSPECT AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY)

(a) Reconnect the A45 AFS ECU (headlight swivel computer assembly) connector.

(b) Connect an oscilloscope to the T2 inner rear view mirror assembly connector.

(c) Check the waveform.

OK:

Tester Connection

Switch Condition

Specified Condition

T2-12 (LIN) - T2-3 (E)

Ignition switch ON

Correct waveform is as shown

Text in Illustration

*a

Front view of wire harness connector

(to Inner Rear View Mirror Assembly)
OK

REPLACE INNER REAR VIEW MIRROR ASSEMBLY

NG

REPLACE AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY)