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 |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
1 CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - BATTERY)
- Disconnect the A21 ECU connector.
- Measure the voltage according to the value(s) in the table below.
Standard voltage
2 CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - GROUND)
- Measure the resistance according to the value(s) in the table below.
Standard resistance
3 CHECK COMMUNICATION LINE
- Disconnect the 1E and A9 ECU connectors.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
HINT:
*1: for Automatic A/C
*2: for Manual A/C
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:
Wireless remote control/
electronic key battery
Replace the battery with a new one if it is depleted.
You will need the following items:
Flathead screwdriver
Lithium battery CR2032
Replacing the battery
Vehicles without a smart key system
Remove the cover using a coin
protected with tape etc.
Remove the deplete ...
On-vehicle inspection
1. INSPECT CURTAIN SHIELD AIRBAG ASSEMBLY
(VEHICLE NOT INVOLVED IN COLLISION)
Perform a diagnostic system check.
With the curtain shield airbag assembly installed on
the vehicle, perform a visual check. If there are any
defects as mentioned below, replace the front pillar
garn ...
Installation
1. INSTALL NAVIGATION ANTENNA ASSEMBLY
2. INSTALL INSTRUMENT PANEL SAFETY PAD SUBASSEMBLY
Using a torque wrench, install the bolt <B>.
Torque: 20 N*m (204 kgf*cm, 14 ft.*lbf)
3. INSTALL SHIFT LEVER ASSEMBLY
Using a torque wrench, install the 4 bolts.
Torque ...
