Toyota RAV4 manuals

Toyota Sienna Service Manual: Power Seat ECU Communication Stop

DTC B1272 Power Seat ECU Communication Stop

DESCRIPTION

This DTC is detected when communication between the seat position control ECU and the multiplex network gateway ECU stops for more than 10 seconds.

DTC No.

DTC Detection Condition

Trouble Area

B1272

Power seat ECU communication stops
  • Seat position control ECU
  • Wire harness

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 CHECK HARNESS AND CONNECTOR (SEAT POSITION CONTROL ECU - BATTERY)

CHECK HARNESS AND CONNECTOR (SEAT POSITION CONTROL ECU - BATTERY)

  1. Disconnect the P58 and P59 ECU connectors.
  2. Measure the voltage according to the value(s) in the table below.

Standard voltage

Standard voltage

2 CHECK HARNESS AND CONNECTOR (SEAT POSITION CONTROL ECU - GROUND)

CHECK HARNESS AND CONNECTOR (SEAT POSITION CONTROL ECU - GROUND)

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

Standard resistance

Standard resistance

3 CHECK COMMUNICATION LINE

CHECK COMMUNICATION LINE

  1. Disconnect the G4 ECU connector.
  2. Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

Result

Result

REPLACE SEAT POSITION CONTROL ECU

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Other materials:

Removal
1. REMOVE REAR SEAT 3 POINT TYPE BELT ASSEMBLY (for 8-Passenger) HINT: Refer to the instructions for disassembly of the rear No. 1 seat assembly (for center seat).  Remove the bolt and rear seat 3 point type belt assembly. 2. REMOVE REAR SEAT 3 POINT TYPE BELT ASSEMBLY (for 7-Pass ...

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Removal
HINT:  Use the same procedures for the RH side and LH side. The procedures listed below are for the LH side. 1. PRECAUTION CAUTION: Be sure to read "PRECAUTION" thoroughly before servicing. 2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL NOTICE: Wait for 90 seconds ...

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