Toyota 4Runner: Trouble in Passenger Airbag ON/OFF Indicator

DESCRIPTION

The occupant classification system detects the front passenger seat condition. The system then informs the passenger of the front passenger airbag assembly and front passenger side knee airbag status (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 indicate the on/off status depending on the conditions listed below.

PROCEDURE

(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, this indicates that a DTC is stored. 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 AIRBAG SYSTEM

OK

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON, and wait for at least 60 seconds.

(d) Using the Techstream, perform the zero point calibration (See page ).

OK:

"Zero Point Calibration is complete." is displayed.

NG

GO TO STEP 5

OK

(a) Using the Techstream, perform the sensitivity check (See page ).

Standard range:

27 to 33 kg (59.5 to 72.8 lb)

NG

GO TO STEP 5

OK

(a) Turn the ignition switch to ON.

(b) Check if the passenger airbag ON/OFF indicator correctly indicates the front passenger seat condition.

OK:

OK

END

NG

(a) Turn the ignition switch off.

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

(c) for Manual Seat:

(1) Tighten the 4 installation bolts of the front seat RH to the specified torque (See page ).

(d) for Power Seat:

(1) Tighten the 4 installation bolts of the front seat RH to the specified torque (See page ).

Torque:

37 N·m {377 kgf·cm, 27 ft·lbf}

NEXT

(a) Turn the ignition switch to ON, and wait for at least 60 seconds.

(b) Using the Techstream, perform the zero point calibration (See page ).

OK:

"Zero Point Calibration is complete." is displayed.

NG

GO TO STEP 8

OK

(a) Using the Techstream, perform the sensitivity check (See page ).

Standard range:

27 to 33 kg (59.5 to 72.8 lb)

OK

END

NG

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

OK:

The display is as specified in the normal condition column.

NG

GO TO STEP 17

OK

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(c) for Manual Seat:

(1) Replace the separate type front seat cushion spring RH (See page ).

(d) for Power Seat:

(1) Replace the separate type front seat cushion spring RH (See page ).

HINT:

Perform the inspection using parts from a normal vehicle when possible.

NEXT

(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

(b) Turn the ignition switch to ON, and wait for at least 60 seconds.

(c) Using the Techstream, perform the zero point calibration (See page ).

OK:

"Zero Point Calibration is complete." is displayed.

NG

GO TO STEP 12

OK

(a) Using the Techstream, perform the sensitivity check (See page ).

Standard range:

27 to 33 kg (59.5 to 72.8 lb)

OK

END

NG

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(c) Check that the connectors (on the occupant classification ECU side and occupant classification sensor side) are not damaged (See page ).

OK:

Connectors are not deformed or damaged.

NG

REPLACE FRONT SEAT WIRE RH

OK

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

(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

(c) Turn the ignition switch to ON, and wait for at least 60 seconds.

(d) Clear the DTCs stored in memory (See page
).

(e) Turn the ignition switch off.

(f) Turn the ignition switch to ON, and wait for at least 60 seconds.

(g) Using the Techstream, check for DTCs of the occupant classification ECU (See page ).

OK:

DTC is not output.

NG

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

OK

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

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

HINT:

Perform the inspection using parts from a normal vehicle when possible.

NEXT

(a) Turn the ignition switch to ON, and wait for at least 60 seconds.

(b) Using the Techstream, perform the zero point calibration (See page ).

OK:

"Zero Point Calibration is complete." is displayed.

NEXT

(a) Using the Techstream, perform the sensitivity check (See page ).

Standard range:

27 to 33 kg (59.5 to 72.8 lb)

NEXT

END

(a) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(b) Turn the ignition switch off.

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

(d) Check that the connectors (on the occupant classification ECU side and front seat inner belt RH side) are not damaged (See page ).

OK:

Connectors are not deformed or damaged.

NG

REPLACE FRONT SEAT WIRE RH

OK

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

NEXT

(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

(b) Turn the ignition switch to ON, and wait for at least 60 seconds.

(c) Using the Techstream, perform the zero point calibration (See page ).

OK:

"Zero Point Calibration is complete." is displayed.

NEXT

(a) Using the Techstream, perform the sensitivity check (See page ).

Standard range:

27 to 33 kg (59.5 to 72.8 lb)

NEXT

END