Trouble in Passenger Airbag ON/OFF Indicator

DESCRIPTION

The occupant classification system detects the front passenger seat condition. It then informs a passenger of the front passenger airbag assembly and front seat belt pretensioner RH condition (activated/not activated) with 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 be ON/OFF depending on the conditions listed below.

Front Passenger Seat Condition	Passenger Airbag ON/OFF Indicator		SRS Warning Light
	ON Indicator	OFF Indicator
Vacant	OFF	OFF	OFF
Adult is seated.	ON	OFF	OFF
Child is seated.	OFF	ON	OFF
Child restraint system is set.	OFF	ON	OFF
Occupant classification system failure	OFF	ON	ON

PROCEDURE

1. CHECK SRS WARNING LIGHT

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

HINT:

If this trouble occurs, the SRS warning light is off. If the light is on, a DTC is output. Troubleshoot for the output DTC.

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 to ON.

NG

GO TO DTC CHART

OK

1. PERFORM ZERO POINT CALIBRATION

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Using the Techstream, perform Zero Point Calibration (See page ).

OK:

"Zero Point Calibration is complete." is displayed.

NG

GO TO STEP 4

OK

1. PERFORM SENSITIVITY CHECK

(a) Using the Techstream, perform Sensitivity Check (See page ).

Standard:

27 to 33 kg (59.5 to 72.8 lb)

OK

END

NG

1. RETIGHTEN FRONT SEAT ASSEMBLY RH BOLT

(a) Turn the ignition switch off.

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

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

Torque:

37 N·m {377 kgf·cm, 27 ft·lbf}

NEXT

1. PERFORM ZERO POINT CALIBRATION

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Using the Techstream, perform Zero Point Calibration (See page ).

OK:

"Zero Point Calibration is complete." is displayed.

NG

GO TO STEP 7

OK

1. PERFORM SENSITIVITY CHECK

(a) Using the Techstream, perform Sensitivity Check (See page ).

Standard:

27 to 33 kg (59.5 to 72.8 lb)

OK

END

NG

1. READ VALUE USING PASSENGER SIDE BUCKLE SWITCH

(a) Turn the ignition switch to ON.

(b) Using the Techstream, read the "Data List" (See page ).

(1) Read the display when the passenger side buckle switch is operated.

Occupant Detection

Tester Display	Measurement Item / Range	Normal Condition	Diagnostic Note
Passenger Buckle SW	Passenger side buckle switch/ Set: The seat belt is fastened Unset: The seat belt is not fastened NG: Data is not determined	Unset/Set	-

OK:

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

NG

GO TO STEP 12

OK

1. CHECK CONNECTORS

(a) Turn the ignition switch off.

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

(c) Disconnect the connectors from the occupant classification ECU and 4 occupant classification sensors.

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

OK:

The terminals are not deformed or damaged.

NG

REPLACE FRONT SEAT WIRE RH

OK

1. REPLACE OCCUPANT CLASSIFICATION ECU

(a) Connect the connectors to the 4 occupant classification sensors.

(b) Replace the occupant classification ECU (See page ).

NEXT

1. PERFORM ZERO POINT CALIBRATION

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

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Using the Techstream, perform Zero Point Calibration (See page ).

OK:

"Zero Point Calibration is complete." is displayed.

NEXT

1. PERFORM SENSITIVITY CHECK

(a) Using the Techstream, perform Sensitivity Check (See page ).

Standard:

27 to 33 kg (59.5 to 72.8 lb)

NEXT

END

1. CHECK CONNECTORS

(a) Turn the ignition switch off.

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

(c) Disconnect the connectors from the occupant classification ECU and front seat inner belt assembly RH.

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

OK:

The terminals are not deformed or damaged.

NG

REPLACE FRONT SEAT WIRE RH

OK

1. REPLACE FRONT SEAT INNER BELT ASSEMBLY RH

(a) Connect the connector to the occupant classification ECU.

(b) Replace the front seat inner belt assembly RH (See page ).

NEXT

1. PERFORM ZERO POINT CALIBRATION

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

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Using the Techstream, perform Zero Point Calibration (See page ).

OK:

"Zero Point Calibration is complete." is displayed.

NEXT

1. PERFORM SENSITIVITY CHECK

(a) Using the Techstream, perform Sensitivity Check (See page ).

Standard:

27 to 33 kg (59.5 to 72.8 lb)

NEXT

END