Toyota Sienna Quiz
Supplemental restraint system

Rear Airbag Sensor LH Circuit Malfunction

In this manual: Supplemental restraint system
Introduction — 55Service specifications — 7Maintenance — 7Engine — 264U151e automatic transaxle — 108Transfer — 19Propeller shaft — 8Drive shaft — 14Differential — 16Axle — 18Suspension — 37Tire and wheel — 54Brake control — 141Parking brake — 16Steering Column — 11Power steering — 18Air conditioning — 106Supplemental restraint system — 146Seat belt — 22Theft deterrent — 14Engine immobiliser — 17Cruise control — 65Lighting — 61Wiper and washer — 13Door lock — 42Meter — 28Audio / visual — 94Navigation — 108Park assist / monitoring — 33Horn — 5Garage door opener — 42GR-FE Engine control system — 126Supplemental restraint system — 147Other system — 14Windshield / windowglass — 43Mirror — 23Instrument panel — 6Seat belt — 22Seat — 92Engine hood / door — 104Exterior — 39Interior — 5Sliding roof — 9Multiplex communication — 18Can communication — 23
25steps
~150min
4/5difficulty
Done 0 of 25

DTC B1155/39 Rear Airbag Sensor LH Circuit Malfunction

DESCRIPTION

The rear airbag sensor LH circuit consists of the center airbag sensor assembly and rear airbag sensor LH.

If the center airbag sensor assembly receives signals from the rear airbag sensor LH, it judges whether or not the SRS should be activated.

DTC B1155/39 is recorded when a malfunction is detected in the rear airbag sensor LH circuit.

DESCRIPTION

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 CHECK DTC

CHECK DTC
  1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
  2. Clear the DTCs stored in memory.
  3. Turn the ignition switch to the LOCK position.
  4. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
  5. Check the DTCs.

OK: DTC B1155/39 is not output.

HINT: Codes other than code B1155/39 may be output at this time, but they are not related to this check.

USE SIMULATION METHOD TO CHECK

2 CHECK CONNECTION OF CONNECTORS

  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
  3. Check that the connectors are properly connected to the center airbag sensor assembly and the rear airbag sensor LH.

OK: The connectors are connected.

3 CHECK FLOOR WIRE (OPEN)

CHECK FLOOR WIRE (OPEN)
  1. Disconnect the connectors from the center airbag sensor assembly and the rear airbag sensor LH.
  2. Using a service wire, connect A20-14 (VUCL) and A20- 13 (ESCL) of connector "B".
NOTICE: Do not forcibly insert a service wire into the terminals of the connector when connecting.
  • Measure the resistance according to the value(s) in the table below.

    • Standard resistance

    Standard resistance
    CHECK FLOOR WIRE (OPEN)
    1. Using a service wire, connect A20-15 (CSL+) and A20-1 (CSL-) of connector "B".
    NOTICE: Do not forcibly insert a service wire into the terminals of the connector when connecting.
  • Measure the resistance according to the value(s) in the table below.

    • Standard resistance

    Standard resistance

    4 CHECK FLOOR WIRE (SHORT TO B+)

    CHECK FLOOR WIRE (SHORT TO B+)
    1. Disconnect SST from connector "B".
    2. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
    3. Turn the ignition switch to the ON position.
    4. Measure the voltage according to the value(s) in the table below.

    Standard voltage

    Standard voltage

    5 CHECK FLOOR WIRE (SHORT TO GROUND)

    CHECK FLOOR WIRE (SHORT TO GROUND)
    1. Turn the ignition switch to the LOCK position.
    2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
    3. Measure the resistance according to the value(s) in the table below.

    Standard resistance

    Standard resistance

    6 CHECK FLOOR WIRE (SHORT)

    CHECK FLOOR WIRE (SHORT)
    1. Measure the resistance according to the value(s) in the table below.

    Standard resistance

    Standard resistance

    7 CHECK REAR AIRBAG SENSOR LH

    CHECK REAR AIRBAG SENSOR LH
    1. Connect the connector to the center airbag sensor assembly.
    2. Interchange the rear airbag sensor RH with LH and connect the connectors to them.
    3. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
    4. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
    5. Clear the DTCs stored in memory.
    6. Turn the ignition switch to the LOCK position.
    7. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
    8. Check the DTCs.

    Result

    Result

    HINT: Codes other than DTC B1154/38 and B1155/39 may be output at this time, but they are not related to this check.

    USE SIMULATION METHOD TO CHECK

    Test yourself

    A quick Toyota Sienna quiz: every answer comes with an explanation and a link to the manual page.