Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Trouble in Passenger Airbag ON/OFF Indicator

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Interior / Supplemental Restraint Systems / Occupant Classification System / Trouble in Passenger Airbag ON/OFF Indicator

DESCRIPTION

The occupant classification system detects the front passenger seat condition. It then displays the instrument panel passenger without door airbag assembly and front seat cushion spring sub-assembly RH condition (activated/not activated) using the passenger airbag ON/OFF indicator.

HINT:

Approximately 6 seconds after the ignition switch is turned to ON, the passenger airbag ON/OFF indicator will indicate ON/OFF depending on the following conditions.

Front Passenger Seat Condition

Passenger Airbag ON/OFF Indicator

SRS Warning Light

ON Indicator

OFF Indicator

Vacant

OFF

ON

OFF

Adult*1 is seated

ON

OFF

OFF

Child*2 is seated

ON or OFF*2

OFF or ON*2

OFF

Child restraint system is installed

OFF

ON

OFF

Occupant classification system failure

OFF

ON

ON
  • *1: The system judges a person of average adult weight or more as an adult. If a smaller adult sits in the front passenger seat, the system may not recognize them as an adult depending on their physique and posture.
  • *2: The system may not recognize a child or a child in a child restraint system as a child depending on factors such as the positioning of the child restraint system or the child's physique or posture.

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

PROCEDURE

1.

CHECK SRS WARNING LIGHT

(a) Turn the ignition switch to ON, and check the SRS warning light condition.

OK:

After the primary check period, the SRS warning light turns off.

HINT:

The primary check is performed for approximately 6 seconds after the ignition switch is turned to ON.

NG

GO TO AIRBAG SYSTEM

OK

2.

PERFORM ZERO POINT CALIBRATION

(a) Using the GTS, perform Occupant Detection Sensor Zero Point Calibration.

Click here

NEXT

3.

CHECK PASSENGER AIRBAG ON/OFF INDICATOR

(a) Check the passenger airbag ON/OFF indicator operation.

Click here

OK:

Passenger airbag ON/OFF indicator operates normally.

OK

END (NORMAL AFTER PERFORMING ZERO POINT CALIBRATION)
NG

4.

RETIGHTEN FRONT SEAT ASSEMBLY RH BOLT

(a) Loosen the 4 installation bolts of the front seat assembly RH.

Click here

(b) Tighten the 4 installation bolts of the front seat assembly RH to the specified torque.

Click here

NEXT

5.

PERFORM ZERO POINT CALIBRATION

(a) Using the GTS, perform Occupant Detection Sensor Zero Point Calibration.

Click here

NEXT

6.

CHECK PASSENGER AIRBAG ON/OFF INDICATOR

(a) Check the passenger airbag ON/OFF indicator operation.

Click here

OK:

Passenger airbag ON/OFF indicator operates normally.

OK

END (THE 4 INSTALLATION BOLTS WAS LOOSEN)
NG

7.

READ VALUE USING GTS

(a) Read the Data List according to the display on the GTS.

Body Electrical > SRS Airbag > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Judgment Result for Occupant Detection System (Buckle Switch of Passenger Seat)

Front passenger side buckle switch

Unknown, Buckle, Unbuckle or Malfunction

Buckle: Front passenger seat belt is fastened

Unbuckle: Front passenger seat belt is not fastened

Malfunction: Front passenger seat belt is malfunctioning

-
Body Electrical > SRS Airbag > Data List

Tester Display

Judgment Result for Occupant Detection System (Buckle Switch of Passenger Seat)

OK:

The GTS display changes correctly in accordance with the operation of the front passenger side buckle switch.

NG

GO TO STEP 11

OK

8.

CHECK CONNECTORS

(a) Turn the ignition switch off.

*1

Front Occupant Classification Sensor LH

*2

Rear Occupant Classification Sensor LH

*3

Airbag ECU Assembly

*4

Wire Harness

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

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

OK:

The terminals are not deformed or damaged.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

REPLACE AIRBAG ECU ASSEMBLY

(a) Connect the connectors to the front occupant classification sensor LH and rear occupant classification sensor LH.

(b) Replace the airbag ECU assembly with a new one.

Click here

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

NEXT

10.

PERFORM ZERO POINT CALIBRATION

(a) Using the GTS, perform Occupant Detection Sensor Zero Point Calibration.

Click here

NEXT

END (AIRBAG SENSOR ASSEMBLY WAS DEFECTIVE)

11.

CHECK CONNECTORS

(a) Turn the ignition switch off.

*1

Front Seat Inner Belt Assembly RH

*2

Airbag ECU Assembly

*3

Wire Harness

(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) Disconnect the connectors from the airbag ECU assembly and front seat inner belt assembly RH.

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

OK:

The terminals are not deformed or damaged.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

12.

REPLACE FRONT SEAT INNER BELT ASSEMBLY RH

(a) Connect the connector to the airbag ECU assembly.

(b) Replace the front seat inner belt assembly RH with a new one.

Click here

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

NEXT

13.

PERFORM ZERO POINT CALIBRATION

(a) Using the GTS, perform Occupant Detection Sensor Zero Point Calibration.

Click here

NEXT

END (FRONT SEAT INNER BELT ASSEMBLY RH WAS DEFECTIVE)

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