Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Load Sensor for Occupant Detection System Circuit Short to Battery (B179312)

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Interior / Supplemental Restraint Systems / Occupant Classification System / Load Sensor for Occupant Detection System Circuit Short to Battery (B179312)

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Test Mode / Check Mode

B179312

Load Sensor for Occupant Detection System Circuit Short to Battery

When the detected voltage is higher than specified value before supplying power to the sensor.
  • Harness or connector
  • Airbag sensor assembly

Comes on

Does not apply to test/check mode

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) battery terminal.

Click here

HINT:

  • When disconnecting and reconnecting the battery, there is an automatic learning function that completes learning when the respective system is used.

    Click here

  • If it is difficult to perform troubleshooting (wire harness inspection), remove the front passenger seat installation bolts to see under the seat cushion.
  • In the above case, lift and hold the seat so that it does not fall down. Hold the seat only as necessary because holding the seat for a long period of time may cause seat rail deformation.

PROCEDURE

1.

CHECK CONNECTION OF CONNECTORS

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 60 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(c) Check that the connectors are properly connected to the airbag ECU assembly, front occupant classification sensor LH and rear occupant classification sensor LH.

OK:

The connectors are properly connected.

NG

CONNECT CONNECTORS PROPERLY
OK

2.

CHECK CONNECTORS

(a) Disconnect the connectors from the airbag ECU assembly, front occupant classification sensor LH and rear occupant classification sensor LH.

(b) Check that the terminals of the connectors are not deformed or damaged.

OK:

The terminals of the connectors are not deformed or damaged.

*1

Front Occupant Classification Sensor LH

*2

Rear Occupant Classification Sensor LH

*3

Airbag ECU Assembly

*4

Wire Harness
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

CHECK HARNESS AND CONNECTOR (AIRBAG ECU ASSEMBLY - FRONT OCCUPANT CLASSIFICATION SENSOR LH - REAR OCCUPANT CLASSIFICATION SENSOR LH)

(a) Connect the cable to the negative (-) battery terminal.

(b) Turn the ignition switch to ON.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

O17-24 (SVC) - Body ground

Ignition switch ON

Below 1 V

j16-1 (SVC) - Body ground

Ignition switch ON

Below 1 V

j17-1 (SVC) - Body ground

Ignition switch ON

Below 1 V

Result:

Proceed to

OK

NG

*1

Front Occupant Classification Sensor LH

*2

Rear Occupant Classification Sensor LH

*3

Airbag ECU Assembly

*4

Wire Harness

*a

Front view of wire harness connector

(to Airbag ECU Assembly)

*b

Front view of wire harness connector

(to Front Occupant Classification Sensor LH)

*c

Front view of wire harness connector

(to Rear Occupant Classification Sensor LH)

(d) Turn the ignition switch off.

(e) Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 60 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

OK

REPLACE AIRBAG ECU ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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