Toyota 4Runner manuals

Toyota 4Runner: Back Door ECU Communication Stop (B1287)

DESCRIPTION

This DTC is stored when LIN communication between the multiplex network door ECU (back door P/W) and main body ECU (multiplex network body ECU) stops for 10 seconds or more.

DTC Code

DTC Detection Condition

Trouble Area

B1287

No communication between the multiplex network door ECU (back door P/W) and main body ECU (multiplex network body ECU) for 10 seconds or more.

  • Multiplex network door ECU (back door P/W)
  • Main body ECU (multiplex network body ECU)
  • Harness or connector

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

  • When using the Techstream with the ignition 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.

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

HINT:

When communication between the multiplex network door ECU (back door P/W) and main body ECU (multiplex network body ECU) stops, DTC B2325 is also stored.

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs (See page ).



NEXT

2.

CHECK FOR DTC

(a) Check for DTCs (See page ).


OK:

DTC B1287 is not output.


OK

USE SIMULATION METHOD TO CHECK


NG

3.

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - MULTIPLEX NETWORK DOOR ECU)

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


(b) Disconnect the V2 multiplex network door ECU (back door P/W) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A-16 (LIN2) - V2-16 (MPX1)

Always

Below 1 Ω

A-16 (LIN2) or V2-16 (MPX1) - Body ground

Always

10 kΩ or higher


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

4.

CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK DOOR ECU - BATTERY AND BODY GROUND)

(a) Disconnect the V2 multiplex network door ECU (back door P/W) connector.


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

V2-6 (GND) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

V2-1 (BDR) - Body ground

Always

11 to 14 V

V2-7 (BECU) - Body ground

Always

11 to 14 V

V2-8 (SIG) - Body ground

Ignition switch ON

11 to 14 V

Text in Illustration

*a

Rear view of wire harness connector

(to Multiplex Network Door ECU [Back Door P/W])


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

5.

REPLACE MULTIPLEX NETWORK DOOR ECU

(a) Temporarily replace the multiplex network door ECU (back door P/W) with a new or normally functioning one (See page ).



NEXT

6.

CLEAR DTC

(a) Clear the DTCs (See page ).



NEXT

7.

CHECK FOR DTC

(a) Check for DTCs (See page ).


OK:

DTC B1287 is not output.


OK

END (MULTIPLEX NETWORK DOOR ECU IS DEFECTIVE)


NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

LIN Communication Master Malfunction (B2287,B278C)
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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 ECU (sliding roof drive g ...

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