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:

Magnetic clutch relay
ON-VEHICLE INSPECTION 1. INSPECT MAGNETIC CLUTCH RELAY (a) Remove the magnetic clutch relay. (b) Measure the resistance according to the value(s) in the table below. Standard resistance If the resistance is not as specified, replace the magnetic clutch relay. ...

Installation
1. INSTALL SEAT MEMORY SWITCH 2. INSTALL FRONT DOOR TRIM BOARD SUBASSEMBLY LH 3. INSTALL POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY 4. INSTALL FRONT DOOR INSIDE HANDLE BEZEL PLUG LH 5. INSTALL FRONT DOOR LOWER FRAME BRACKET GARNISH LH  Engage the 4 claws to install the seat me ...

Removal
1. DRAIN BRAKE FLUID NOTICE: Wash brake fluid off immediately if it adheres to any painted surface. 2. DISCONNECT BATTERY NEGATIVE TERMINAL 3. REMOVE AIR CLEANER ASSEMBLY WITH HOSE 4. REMOVE BRAKE ACTUATOR WITH BRACKET (a) Release the latch of the brake actuator connector to disconnect the c ...

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