Toyota Tundra Service Manual: LIN Communication Bus Malfunction (B2325)

Toyota Tundra Service Manual / Power Source, Network / Multiplex Communication / Lin Communication System / LIN Communication Bus Malfunction (B2325)

DESCRIPTION

The main body ECU (multiplex network body ECU) intermittently monitors the LIN communication bus between the components related to the doors and sliding roof drive gear sub-assembly*. DTC B2325 is stored when a malfunction in the LIN communication bus between the components related to the doors and sliding roof drive gear sub-assembly* is detected consecutively 3 times.

  • *: w/ Sliding Roof System

DTC No.

DTC Detection Condition

Trouble Area
*1: for Power Window Control System (w/ Jam Protection Function)

*2: w/ Sliding Roof System

B2325

The main body ECU (multiplex network body ECU) detects a malfunction in the LIN communication bus between components related to the window and sliding roof consecutively 3 times.
  • Power window regulator master switch assembly*1
  • Front power window regulator motor assembly LH*1
  • Front power window regulator motor assembly RH*1
  • Sliding roof drive gear sub-assembly (Sliding Roof ECU)*2
  • Main body ECU (multiplex network body ECU)
  • Driver side junction block assembly
  • Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When using the Techstream with the engine switch off to troubleshoot:

    Connect the Techstream to the vehicle and turn a courtesy light switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.

  • When the power window regulator motor assembly (driver side) is removed and reinstalled or replaced, the power window regulator motor assembly (driver side) must be initialized.

    Click here

  • w/ Sliding Roof System:

    When the sliding roof drive gear sub-assembly is removed and reinstalled or replaced, the sliding roof drive gear sub-assembly must be initialized.

    Click here

HINT:

When DTC B2325 and a LIN communication stop DTC are output simultaneously, first perform troubleshooting for DTC B2325. Then perform troubleshooting for the LIN communication stop DTC.

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Click here

NEXT

2.

CHECK FOR DTC

(a) Check for DTCs.

Click here

DTC B2325 is not output

USE SIMULATION METHOD TO CHECK

DTC B2325 is output

3.

CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY - FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH)

(a) Disconnect the N2 power window regulator master switch assembly connector.

(b) Disconnect the N12 front power window regulator motor assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

N2-7 (LIN2) - N12-9 (LIN)

Always

Below 1 Ω

N2-7 (LIN2) or N12-9 (LIN) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK HARNESS AND CONNECTOR (LIN BUS CIRCUIT)
  • *: w/ Sliding Roof System

(a) Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly.

Click here

(b) Disconnect the N2 power window regulator master switch assembly connector.

(c) Disconnect the N12 front power window regulator motor assembly LH connector.

(d) Disconnect the M11 front power window regulator motor assembly RH connector.

(e) Disconnect the W3 sliding roof drive gear sub-assembly connector.*

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A-16 (LIN2) - N2-6 (LIN1)

Always

Below 1 Ω

A-16 (LIN2) - N12-9 (LIN)

Always

Below 1 Ω

A-16 (LIN2) - M11-9 (LIN)

Always

Below 1 Ω

A-16 (LIN2) - W3-3 (LIN)*

Always

Below 1 Ω

N2-17 (LIN1) - Body ground

Always

10 kΩ or higher

N12-9 (LIN) - Body ground

Always

10 kΩ or higher

M11-9 (LIN) - Body ground

Always

10 kΩ or higher

W3-3 (LIN) - Body ground*

Always

10 kΩ or higher

Result

Proceed to

OK (w/ Sliding Roof System)

A

OK (w/o Sliding Roof System)

B

NG

C
B

GO TO STEP 7

C

GO TO STEP 13

A

5.

CLEAR DTC

(a) Clear the DTCs.

Click here

NEXT

6.

CHECK FOR DTC

(a) Disconnect the W3 sliding roof drive gear sub-assembly connector.

(b) Check for DTCs.

Click here

DTC B2325 is not output

REPLACE SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY

DTC B2325 is output

7.

CLEAR DTC

(a) Clear the DTCs.

Click here

NEXT

8.

CHECK FOR DTC

(a) Disconnect the N2 power window regulator master switch assembly connector.

(b) Check for DTCs.

Click here

DTC B2325 is not output

REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY

DTC B2325 is output

9.

CLEAR DTC

(a) Clear the DTCs.

Click here

NEXT

10.

CHECK FOR DTC

(a) Disconnect the N12 front power window regulator motor assembly LH connector.

(b) Check for DTCs.

Click here

DTC B2325 is not output

REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH

DTC B2325 is output

11.

CLEAR DTC

(a) Clear the DTCs.

Click here

NEXT

12.

CHECK FOR DTC

(a) Disconnect the M11 front power window regulator motor assembly RH connector.

(b) Check for DTCs.

Click here

DTC B2325 is output

REPLACE BODY ECU (MULTIPLEX NETWORK BODY ECU)

DTC B2325 is not output

REPLACE FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY RH

13.

CHECK HARNESS AND CONNECTOR (LIN BUS CIRCUIT)
  • *: w/ Sliding Roof System

(a) Disconnect the 3I driver side junction block assembly connector.

(b) Disconnect the N2 power window regulator master switch assembly connector.

(c) Disconnect the N12 front power window regulator motor assembly LH connector.

(d) Disconnect the M11 front power window regulator motor assembly RH connector.

(e) Disconnect the W3 sliding roof drive gear sub-assembly connector.*

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3I-17 - N2-6 (LIN1)

Always

Below 1 Ω

3I-17 - N12-9 (LIN)

Always

Below 1 Ω

3I-17 - M11-9 (LIN)

Always

Below 1 Ω

3I-17 - W3-3 (LIN)*

Always

Below 1 Ω

N2-6 (LIN1) - Body ground

Always

10 kΩ or higher

N12-9 (LIN) - Body ground

Always

10 kΩ or higher

M11-9 (LIN) - Body ground

Always

10 kΩ or higher

W3-9 (LIN) - Body ground*

Always

10 kΩ or higher
OK

REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    Front Passenger Side Door ECU Communication Stop (B2322)

    Data List / Active Test

    See More:

    Toyota Tundra Service Manual > Sfi System: Throttle Actuator Control System - Stuck Open (P2111,P2112)
    DESCRIPTION The throttle actuator is operated by the ECM, and opens and closes the throttle valve using gears. The opening angle of the throttle valve is detected by the Throttle Position (TP) sensor, which is mounted on the throttle with motor body assembly. The TP sensor provides feedback to the E ...

    Toyota Tundra Owners Manual

    Toyota Tundra Service Manual

    © 2026 Copyright www.ttundra.com
    0.026