Last Modified: 4-30-2014 6.6 J Doc ID: RM000001P38001X
Model Year: 2006 Model: LX470 Prod Date Range: [01/2006 -           ]
Title: SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: Trouble in Passenger Airbag ON/OFF Indicator; 2006 MY LX470 [01/2006 -        ]

Trouble in Passenger Airbag ON/OFF Indicator

DESCRIPTION

This circuit detects the passenger seat occupant classification status (detected by the occupant classification system). The passenger airbag ON / OFF indicator ON or OFF comes on to inform the passengers of the front passenger airbag status (activated or deactivated).

NOTICE:

Replace the occupant classification ECU, occupant classification sensor, seat cushion cover pad, seat cushion cover and seat cushion seat heater as a 5 part set (see supply set part no.).

HINT:

The table below shows the normal indication condition of the passenger airbag ON / OFF indicator based on the front passenger seat condition.

Front Passenger Seat Condition

ON Indicator

OFF Indicator

Adult is seated

ON

OFF

Child is seated

OFF

ON

Vacant

OFF

OFF

Occupant classification system failure

OFF

ON

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK PASSENGER AIRBAG ON / OFF INDICATOR (PERFORM SENSITIVITY CHECK)

(a) Perform the sensitivity check 2006 MY LX470 [01/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: INITIALIZATION .

OK

GO TO STEP 7

NG

2.

PERFORM ZERO POINT CALIBRATION

(a) Connect the intelligent tester (with CAN VIM) to the DLC3.

(b) Turn the ignition switch ON.

(c) Using the intelligent tester, perform the zero point calibration 2006 MY LX470 [01/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: INITIALIZATION .

NEXT

3.

CHECK PASSENGER AIRBAG ON / OFF INDICATOR (PERFORM SENSITIVITY CHECK)

(a) Perform the sensitivity check 2006 MY LX470 [01/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: INITIALIZATION .

OK

END

NG

4.

READ VALUE USING INTELLIGENT TESTER (PASSENGER SIDE BUCKLE SWITCH)

(a) Turn the ignition switch ON.

(b) Using the intelligent tester, read the DATA LIST.

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

Occupant classification ECU

Item

Measurement Item / Range (Display)

Normal Condition

Diagnostic Note

P BUCKLE SW

Buckle switch (Passenger side) /

UNSET: The seat belt is not fastened

SET: The seat belt is fastened

NG: Data is not determined

UNSET / SET

-

OK:

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

NG

REPLACE FRONT SEAT INNER BELT RH

OK

5.

READ VALUE USING INTELLIGENT TESTER (SEAT BELT TENSION SENSOR)

(a) Fasten the passenger side seat belt.

(b) Turn the ignition switch ON.

(c) Using the intelligent tester, read the value of the DATA LIST.

Occupant classification ECU

Item

Measurement Item / Range (Display)

Normal Condition

Diagnostic Note

FILTERED TENSION

Filtered belt tension output /

Min.: 0 N

Max.: 255 N

39 to 229

-

OK:

When there is no tension on the belt, 39 to 229 is displayed on the tester.

NG

REPLACE FRONT SEAT OUTER BELT RH

OK

6.

CHECK PASSENGER AIRBAG ON / OFF INDICATOR (PERFORM SENSITIVITY CHECK)

(a) Perform the sensitivity check 2006 MY LX470 [01/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: INITIALIZATION .

OK

END

NG

7.

CHECK CONNECTOR

(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 following connectors are connected properly.

  • Center airbag sensor connector.
  • Occupant classification ECU connector.
  • Occupant classification sensor connector.
  • Airbag cut-off switch connector.
  • Belt tension sensor (front seat outer belt RH) connector.
  • Front seat inner belt RH connector.
  • Seat position sensor connector.

OK:

The connectors are properly connected.

(d) Disconnect the following connectors.

  • Center airbag sensor connector.
  • Occupant classification ECU connector.
  • Occupant classification sensor connector.
  • Airbag cut-off switch connector.
  • Belt tension sensor (front seat outer belt RH) connector.
  • Front seat inner belt RH connector.
  • Seat position sensor connector.

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

OK:

The terminals are not deformed or damaged.

NOTICE:

Perform the zero point calibration if wire harnesses or connectors are repaired or replaced 2006 MY LX470 [01/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: INITIALIZATION .

HINT:

If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

READ VALUE USING INTELLIGENT TESTER (PASSENGER CLASS)

(a) Connect the intelligent tester (with CAN VIM) to the DLC3.

(b) Turn the ignition switch OFF.

(c) Place a weight of 20 kg (44.0 lb) on the front passenger seat.

NOTICE:

  • Do not let the weight come into contact with the seatback when placing it on the seat cushion.
  • Place the weight in the area shown in the illustration.

(d) Turn the ignition switch ON.

(e) Using the intelligent tester, read the value of the DATA LIST 2006 MY LX470 [01/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: DATA LIST / ACTIVE TEST .

Occupant classification ECU

Item

Measurement Item / Range (Display)

Normal Condition

Diagnostic Note

PASSENGER CLASS

Passenger classification /

NG / AF05 / AM50 / CHILD / OFF

NG: Data is not determined

AM50: Adult is seated and seat is rear position

AF05: Adult is seated and seat is front position

CHILD: Child is seated

OFF: Vacant

-

OK:

The tester displays CHILD.

(f) Turn the ignition switch OFF.

(g) Add 30 kg (66.1 lb) weight on the front passenger seat.

NOTICE:

  • Do not let the weight come into contact with the seatback when placing it on the seat cushion.
  • Place the weight in the area shown in the illustration.

(h) Turn the ignition switch ON.

(i) Using the intelligent tester, read the value of the DATA LIST 2006 MY LX470 [01/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: DATA LIST / ACTIVE TEST .

HINT:

AF05 appears on the tester screen display when the seat is in the front position, and AM50 appears when the seat is in the rear position.

Occupant classification ECU

Item

Measurement Item / Range (Display)

Normal Condition

Diagnostic Note

PASSENGER CLASS

Passenger classification /

AF05 / AM50 / CHILD / OFF

NG: Data is not determined

AM50: Adult is seated and seat is rear position

AF05: Adult is seated and seat is front position

CHILD: Child is seated

OFF: Vacant

-

OK:

The tester displays AM50 or AF50 according to the seat position.

NG

GO TO STEP 12

OK

9.

REPLACE CENTER AIRBAG SENSOR

(a) Turn the ignition switch OFF.

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

(c) Replace the center airbag sensor 2006 MY LX470 [05/2005 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL .

NEXT

10.

CHECK PASSENGER AIRBAG ON / OFF INDICATOR (PERFORM SENSITIVITY CHECK)

(a) Perform the sensitivity check 2006 MY LX470 [01/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: INITIALIZATION .

OK

END

NG

11.

REPLACE OCCUPANT CLASSIFICATION ECU

(a) Connect the intelligent tester (with CAN VIM) to the DLC3.

(b) Turn the ignition switch ON.

(c) Store the occupant classification ECU data into the intelligent tester 2006 MY LX470 [01/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: REGISTRATION .

HINT:

If the ECU data cannot be stored in the intelligent tester, replace the front seat cushion (with occupant classification ECU and occupant classification sensor).

(d) Turn the ignition switch OFF.

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

(f) Replace the occupant classification ECU 2006 MY LX470 [01/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION ECU: REMOVAL .

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

(h) Turn the ignition switch ON.

(i) Load the data from the previous ECU stored in the tester into the newly installed ECU 2006 MY LX470 [01/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: REGISTRATION .

NEXT

END

12.

REPLACE OCCUPANT CLASSIFICATION ECU

(a) Connect the intelligent tester (with CAN VIM) to the DLC3.

(b) Turn the ignition switch ON.

(c) Store the occupant classification ECU data into the intelligent tester 2006 MY LX470 [01/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: REGISTRATION .

HINT:

If the ECU data cannot be stored in the intelligent tester, replace the front seat cushion (with occupant classification ECU and occupant classification sensor).

(d) Turn the ignition switch OFF.

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

(f) Replace the occupant classification ECU.

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

(h) Turn the ignition switch ON.

(i) Load the data from the previous ECU stored in the tester into the newly installed ECU 2006 MY LX470 [01/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: REGISTRATION .

NEXT

13.

CHECK PASSENGER AIRBAG ON / OFF INDICATOR (PERFORM SENSITIVITY CHECK)

(a) Perform the sensitivity check 2006 MY LX470 [01/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: INITIALIZATION .

OK

END

NG

14.

REPLACE FRONT SEAT CUSHION (WITH OCCUPANT CLASSIFICATION ECU AND SENSOR)

(a) Turn the ignition switch OFF.

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

(c) Replace the front seat cushion (with occupant classification ECU and occupant classification sensor).

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

(e) Turn the ignition switch ON.

(f) Clear the DTCs stored in the memory 2006 MY LX470 [01/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: DTC CHECK / CLEAR .

HINT:

First clear DTCs stored in the occupant classification ECU and then in the center airbag sensor.

(g) Turn the ignition switch OFF.

(h) Turn the ignition switch ON.

(i) Check the DTCs 2006 MY LX470 [01/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: DTC CHECK / CLEAR .

OK:

DTC B1774 and B1775 are not output.

HINT:

DTCs other than B1774 and B1775 may be output at this time, but they are not related to this check.

NEXT

15.

PERFORM ZERO POINT CALIBRATION

(a) Connect the intelligent tester (with CAN VIM) to the DLC3.

(b) Turn the ignition switch ON.

(c) Using the intelligent tester, perform the zero point calibration 2006 MY LX470 [01/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: INITIALIZATION .

NEXT

END