Toyota RAV4 manuals

Toyota Sienna Service Manual: Airbag ECU Communication Stop

DTC B1281 Airbag ECU Communication Stop

DESCRIPTION

DTC B1281 is output when communication between the airbag ECU and the multiplex network gateway ECU stops for more than 10 seconds.

DTC No.

DTC Detection Condition

Trouble Area

B1281

Airbag ECU communication stops
  • Airbag sensor assembly
  • Wire harness

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - BATTERY)

CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - BATTERY)

  1. Disconnect the A21 ECU connector.
  2. Measure the voltage according to the value(s) in the table below.

Standard voltage

Standard voltage

2 CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - GROUND)

CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - 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 1E and A9 ECU connectors.
  2. Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

HINT:
*1: for Automatic A/C
*2: for Manual A/C

Result

Result

REPLACE AIRBAG SENSOR ASSEMBLY

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 ...

Back Door ECU Communication Stop
DTC B1287 Back Door ECU Communication Stop DESCRIPTION DTC B1287 is output when communication between the power back door ECU and the multiplex network gateway ECU stops for more than 10 seconds. ...

Other materials:

CD cannot be Ejected
INSPECTION PROCEDURE 1 PRESS "EJECT" AND CHECK OPERATION Press the CD EJECT switch of the radio receiver for 2 seconds or more and check that the CD is ejected. OK: CD is ejected 2 REPLACE CD WITH ANOTHER AND RECHECK Insert another CD and check if it is ejected. OK: CD ...

Removal
1. Remove engine under cover no.1 2. Disconnect cable from negative battery terminal 3. Drain automatic transaxle fluid (see page ax-131) 4. Remove automatic transaxle oil pan subassembly (a) Remove the 18 bolts, oil pan and gasket. NOTICE: Some fluid will remain in the oil pan. ...

Maintenance data (fuel, oil level, etc.)
Dimensions and weights *1: Unladen vehicle *2: The model code is indicated on the Certification Label. For details, see “Vehicle identification” below. *3: The towing package is required. Toyota does not recommend towing with this vehicle without the towing package. Vehicle identifi ...

© 2011-2023 Copyright www.tsienna.net