Toyota CH-R Service Manual: 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 airbag assembly and front seat cushion airbag assembly RH condition (activated/not activated) using the passenger airbag ON/OFF indicator.

HINT:

Approximately 6 seconds after the ignition switch is turned 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 turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

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 goes off.

HINT:

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

NG

GO TO AIRBAG SYSTEM

OK

2.

PERFORM ZERO POINT CALIBRATION

(a) Using the Techstream, perform Zero Point Calibration.

Click here

Body Electrical > Occupant Detection > Utility

Tester Display

Zero Point Calibration

OK:

"Zero Point Calibration is complete." is displayed.

OK

END

NG

3.

RETIGHTEN FRONT SEAT ASSEMBLY RH BOLT

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

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

Click here

NEXT

4.

PERFORM ZERO POINT CALIBRATION

(a) Using the Techstream, perform Zero Point Calibration.

Click here

Body Electrical > Occupant Detection > Utility

Tester Display

Zero Point Calibration

OK:

"Zero Point Calibration is complete." is displayed.

OK

END

NG

5.

READ VALUE USING TECHSTREAM

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Occupant Detection / Data List.

(f) Read the Data List according to the display on the Techstream.

Body Electrical > Occupant Detection > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Passenger Buckle SW

Passenger side buckle switch

NG, Set or Unset

Set: Front passenger seat belt is fastened

Unset: Front passenger seat belt is not fastened

"NG" will be displayed immediately after the ignition switch is turned on.

Body Electrical > Occupant Detection > Data List

Tester Display

Passenger Buckle SW

OK:

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

NG

GO TO STEP 9

OK

6.

CHECK CONNECTORS

(a) Turn the ignition switch off.

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

(c) Disconnect the connectors from the occupant detection ECU, front in weight detection sensor sub-assembly and rear in weight detection sensor sub-assembly.

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

OK:

The terminals are not deformed or damaged.

NG

REPLACE FRONT SEAT WIRE RH

OK

7.

REPLACE OCCUPANT DETECTION ECU

(a) Connect the connectors to the front in weight detection sensor sub-assembly and rear in weight detection sensor sub-assembly.

(b) Replace the occupant detection ECU.

Click here

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

NEXT

8.

PERFORM ZERO POINT CALIBRATION

(a) Using the Techstream, perform Zero Point Calibration.

Click here

Body Electrical > Occupant Detection > Utility

Tester Display

Zero Point Calibration

NEXT

END

9.

CHECK CONNECTORS

(a) Turn the ignition switch off.

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

(c) Disconnect the connectors from the occupant detection ECU 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

REPLACE FRONT SEAT WIRE RH

OK

10.

REPLACE FRONT SEAT INNER BELT ASSEMBLY RH

(a) Turn the ignition switch off.

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

(c) Replace the front seat inner belt assembly RH.

Click here

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

NEXT

11.

PERFORM ZERO POINT CALIBRATION

(a) Using the Techstream, perform Zero Point Calibration.

Click here

Body Electrical > Occupant Detection > Utility

Tester Display

Zero Point Calibration

NEXT

END

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