Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VJJG
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM(for Start Function): B2271; Ignition Hold Monitor Malfunction; 2016 - 2020 MY Sienna [12/2015 -        ]

DTC

B2271

Ignition Hold Monitor Malfunction

DESCRIPTION

This DTC is stored when a malfunction in the IG1 drive circuit, IG2 drive circuit or IG hold circuit in the power management control ECU is detected.

HINT:

  • When the power management control ECU is replaced with a new one and the cable is connected to the negative (-) battery terminal, the power source mode changes to on (IG).
  • When the battery cable is disconnected and reconnected, the power source returns to the mode it was in before the battery cable was disconnected.

DTC Code

DTC Detection Condition

Trouble Area

DTC Output Confirmation Operation

B2271

Either condition is met (1-trip detection logic*):

  • The IG1 or IG2 drive circuit in the power management control ECU is malfunctioning.
  • The IG hold circuit in the power management control ECU is malfunctioning.
  • AM2 No.2 fuse
  • Power management control ECU
  • Harness or connector

Turn the engine switch on (IG).

HINT:

To turn the engine switch on (IG), carry the key and press the engine switch twice with the shift lever in P and the brake pedal released.
  • *: Only output while a malfunction is present and the engine switch is on (IG)

HINT:

  • The IG1 and IG2 drive circuits activate the IG1 and IG2 relays.
  • After the IG1 and IG2 drive circuits turn on, even if the power management control ECU operates incorrectly, the IG hold circuit maintains the engine switch on (IG) state.

Vehicle Condition and Fail-safe Function when Malfunction Detected

Vehicle Condition when Malfunction Detected

Fail-safe Function when Malfunction Detected

The power source mode is not allowed to change to on (IG) (the engine cannot be started).

The power source mode cannot be changed to on (IG).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When using the Techstream with the engine switch off, perform either of the following: 1) Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and vehicle begins, or 2) connect the Techstream to the vehicle, select the vehicle type under manual mode, and then enter the following menus: Body Electrical / Smart Key / Trouble Codes.
  • The smart key system uses multiplex communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting (See page 2016 MY Sienna [12/2015 - 08/2016]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING 2017 MY Sienna [08/2016 - 11/2017]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING 2018 - 2020 MY Sienna [11/2017 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING ).
  • Inspect the fuses of circuits related to this system before performing the following inspection procedure.
  • After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

Related Data List and Active Test Items

DTC

Data List Item

Active Test Item

B2271

Power Source Control

  • IG1 Relay Monitor(Inside)
  • IG2 Relay Monitor(Inside)
  • Latch Circuit

Starting Control

  • Ignition

-

PROCEDURE

1.

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

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

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

D89-2 (AM21) - Body ground

Always

9.5 to 14 V

D89-1 (AM22) - Body ground

Text in Illustration

*a

Rear view of wire harness connector

(to Power Management Control ECU)
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE
OK

2.

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

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D89-6 (GND) - Body ground

Always

Below 1 Ω

D89-5 (GND2) - Body ground

Text in Illustration

*a

Rear view of wire harness connector

(to Power Management Control ECU)
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

INSPECT POWER MANAGEMENT CONTROL ECU

(a) Connect the power management control ECU connectors.

Text in Illustration

*a

Component with harness connected

(Power Management Control ECU)

-

-

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A35-8 (IG2D) - Body ground

Engine switch off

1 V or less

Engine switch on (IG)*

9 V or higher

D89-20 (IG1D) - Body ground

Engine switch off

1 V or less

Engine switch on (IG)*

9 V or higher
  • *: To turn the engine switch on (IG), carry the key and press the engine switch twice with the shift lever in P and the brake pedal released.
OK

SYSTEM RETURNED TO NORMAL (DTC STORED DUE TO BAD CONNECTION, BUT SYSTEM RETURNED TO NORMAL BY RECONNECTING CONNECTOR)
NG

REPLACE POWER MANAGEMENT CONTROL ECU

(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 )