Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VJF0
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: NETWORKING: LIN COMMUNICATION SYSTEM: B2287,B278C; LIN Communication Master Malfunction; 2016 - 2020 MY Sienna [12/2015 -        ]

DTC

B2287

LIN Communication Master Malfunction

DTC

B278C

Lost Communication with Power Source Control

DESCRIPTION

  • DTC 2287 is stored when there is an open or short circuit or an ECU communication malfunction between the certification ECU (smart key ECU) and power management control ECU.
  • DTC 278C is stored when LIN communication between the certification ECU and power management control ECU stops for 10 seconds or more.

DTC Code

DTC Detection Condition

Trouble Area

B2287

There is an open or short circuit or an ECU communication malfunction between the certification ECU (smart key ECU) and power management control ECU.

  • Power management control ECU
  • Certification ECU (smart key ECU)
  • Harness or connector

B278C

No communication between the certification ECU (smart key ECU) and power management control ECU for more than 10 seconds.

  • Power management control ECU
  • Certification ECU (smart key ECU)
  • Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • If the certification ECU (smart key ECU) is replaced, register the key.
  • When using the Techstream to troubleshoot with the engine switch off:

    Connect the Techstream to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.

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

PROCEDURE

1.

CLEAR DTC

(a) Clear 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

B2287 or B278C are output

A

B2287 or B278C and B2785 are output

B

HINT:

When both B2287 or B278C and B2785 are output at the same time, troubleshoot B2785 first.

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

(See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; NETWORKING: LIN COMMUNICATION SYSTEM: DIAGNOSTIC TROUBLE CODE CHART 2018 - 2020 MY Sienna [11/2017 -        ]; NETWORKING: LIN COMMUNICATION SYSTEM: DIAGNOSTIC TROUBLE CODE CHART )

A

3.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - POWER MANAGEMENT CONTROL ECU)

(a) Disconnect the D88 certification ECU (smart key ECU) and D89 power management control ECU connectors.

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

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

D88-29 (LIN) - D89-24 (LIN2)

Always

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

D88-29 (LIN) - Body ground

Always

10 kΩ or higher

Text in Illustration

*a

Front view of wire harness connector

(to Certification ECU (Smart Key ECU))

*b

Front view of wire harness connector

(to Power Management Control ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY AND BODY GROUND)

(a) Disconnect the D89 power management control ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D89-5 (GND2) - Body ground

Always

Below 1 Ω

D89-6 (GND) - Body ground

Always

Below 1 Ω

Standard Voltage:

Tester Connection

Condition

Specified Condition

D89-1 (AM22) - Body ground

Always

11 to 14 V

D89-2 (AM21) - Body ground

Always

11 to 14 V

Text in Illustration

*a

Front view of wire harness connector

(to Power Management ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

REPLACE POWER MANAGEMENT CONTROL ECU

(a) Replace the power management control ECU with a normally functioning part (See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; POWER DISTRIBUTION: POWER MANAGEMENT CONTROL ECU: REMOVAL 2018 - 2020 MY Sienna [11/2017 -        ]; POWER DISTRIBUTION: POWER MANAGEMENT CONTROL ECU: REMOVAL ).

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

NEXT

6.

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

B2287 or B278C are output

A

B2287 or B278C and B2785 are output

B

A

END (POWER MANAGEMENT CONTROL ECU IS MALFUNCTIONING)

B

REPLACE CERTIFICATION ECU (SMART KEY ECU)

(See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2018 - 2020 MY Sienna [11/2017 -        ]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL )