Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM00000158200CX
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: B1795; Occupant Classification ECU Malfunction; 2007 MY LX470 [08/2006 -        ]

DTC

B1795

Occupant Classification ECU Malfunction

DESCRIPTION

DTC B1795 is set when a malfunction is detected in the occupant classification ECU.

DTC No.

DTC Detection Condition

Trouble Area

B1795

Occupant classification ECU malfunction

Occupant classification ECU

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:

  • When DTC B1650/32 is detected as a result of troubleshooting the supplemental restraint system, check the DTCs stored in the occupant classification ECU, and perform troubleshooting for those DTCs first.
  • Use the intelligent tester to check for DTCs of the occupant classification ECU, otherwise the DTCs cannot be read.

INSPECTION PROCEDURE

HINT:

  • If troubleshooting (wire harness inspection) is difficult to perform, remove the front passenger seat installation bolts to see the undersurface of the seat cushion.
  • In the above case, hold the seat so that it does not tip over. Holding the seat up for a long period of time may cause problems, such as seat rail deformation. Hold the seat up only for as long as necessary.

PROCEDURE

1.

CHECK FOR DTC

(a) Turn the ignition switch ON.

(b) Clear any DTCs stored in the memory 2007 MY LX470 [08/2006 -        ]; 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.

(c) Turn the ignition switch OFF.

(d) Turn the ignition switch ON, and wait for at least 10 seconds.

(e) Check the DTCs 2007 MY LX470 [08/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: DTC CHECK / CLEAR .

OK:

DTC B1795 is not output.

HINT:

DTCs other than B1795 may be output at this time, but they are not related to this check.

OK

USE SIMULATION METHOD TO CHECK

NG

2.

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 2007 MY LX470 [08/2006 -        ]; 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 2007 MY LX470 [08/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: REGISTRATION .

(j) Turn the ignition switch OFF.

(k) Turn the ignition switch ON.

(l) Clear the DTCs stored in the memory 2007 MY LX470 [08/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: DTC CHECK / CLEAR .

HINT:

If DTCs are not cleared at this time, past DTCs will remain.

NEXT

3.

PERFORM SENSITIVITY CHECK

(a) Perform the sensitivity check 2007 MY LX470 [08/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: INITIALIZATION .

NEXT

END