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:

Disassembly
1. INSPECT PACK CLEARANCE OF FORWARD CLUTCH HINT: (See page AX-242) 2. REMOVE FORWARD MULTIPLE DISC CLUTCH DISC (a) Using a screwdriver, remove the snap ring. (b) Remove the flange, 5 discs and 5 plates from the input shaft assembly. 3. REMOVE FORWARD CLUTCH RETURN SPRING SUB-ASSEMB ...

Terminals of ECU
1. CHECK DISTANCE CONTROL ECU Reference: waveform 1 HINT:  Terminal: LRDD - SGND  Gauge set: 2 V/DIV., 10 ms./DIV.  Condition: ignition switch in the ON position Reference: waveform 2 HINT:  Terminal: LRRD - SGND  Gauge set: 2 V/ ...

Removal
1. REMOVE REAR WHEEL 2. REMOVE SKID CONTROL SENSOR WIRE (for 2WD) (a) Disconnect the skid control sensor connector. (b) Remove the bolt and disconnect the bracket from the rear axle beam assembly. HINT: Separate the RH side by the same procedures as the LH side. 3. SEPARATE SPEED SENSO ...

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