Toyota Sienna Quiz
Supplemental restraint system

Short to B+ in Front Pretensioner Squib LH Circuit

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
26steps
~161min
5/5difficulty
1special tools
Done 0 of 26

DTC B0138/72 Short to B+ in Front Pretensioner Squib LH Circuit

DESCRIPTION

The front pretensioner squib LH circuit consists of the center airbag sensor assembly and the front seat outer belt assembly LH.

This circuit instructs the SRS to deploy when deployment conditions are met.

DTC B0138/72 is recorded when a short to B+ is detected in the front pretensioner squib LH circuit.

DTC No.

DTC Detecting Condition

Trouble Area

B0138/72
  • Short circuit in front pretensioner squib LH wire harness (to B+)
  • Front pretensioner squib LH malfunction
  • Center airbag sensor assembly malfunction
  • Front seat outer belt assembly LH (Front pretensioner squib LH)
  • Center airbag sensor assembly
  • Floor wire

INSPECTION PROCEDURE

HINT:

  • Perform the simulation method by selecting the "check mode" (signal check) with the intelligent tester (8).
  • After selecting the "check mode" (signal check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on a city or rough road

1 CHECK FRONT SEAT OUTER BELT ASSEMBLY LH (FRONT PRETENSIONER SQUIB LH)

CHECK FRONT SEAT OUTER BELT ASSEMBLY LH (FRONT PRETENSIONER SQUIB LH)
  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. Disconnect the connectors from the front seat outer belt assembly LH.
  4. Connect the white wire side of SST (resistance 2.1 Ω) to the floor wire.

CAUTION: Never connect a tester to the front seat outer belt assembly LH (front pretensioner squib LH) for measurement, as this may lead to a serious injury due to airbag deployment.

NOTICE: Do not forcibly insert the SST into the terminals of the connector when connecting.

Insert the SST straight into the terminals of the connector.

SST 09843-18060

  1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
  2. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
  3. Clear the DTCs stored in memory (5).
  4. Turn the ignition switch to the LOCK position.
  5. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
  6. Check the DTCs (5).

OK: DTC B0138/72 is not output. HINT: Codes other than DTC B0138/72 may be output at this time, but they are not related to this check.

Go to step 2

REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH

2 CHECK FLOOR WIRE (FRONT PRETENSIONER SQUIB LH CIRCUIT)

CHECK FLOOR WIRE (FRONT PRETENSIONER SQUIB LH CIRCUIT)
  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. Disconnect the SST (resistance 2.1 Ω) from the floor wire.
  4. Disconnect the connector from the center airbag sensor assembly.
  5. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
  6. Turn the ignition switch to the ON position.
  7. Measure the voltage according to the value(s) in the table below.

Standard voltage

Standard voltage

REPAIR OR REPLACE FLOOR WIRE

3 CHECK CENTER AIRBAG SENSOR ASSEMBLY

CHECK CENTER AIRBAG SENSOR ASSEMBLY
  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. Connect the connectors to the front seat outer belt assembly LH and the center airbag sensor assembly.
  4. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
  5. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
  6. Clear the DTCs stored in memory (5).
  7. Turn the ignition switch to the LOCK position.
  8. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
  9. Check the DTCs (5).

OK: DTC B0138/72 is not output.

HINT: Codes other than DTC B0138/72 may be output at this time, but they are not related to this check.

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

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.