| Last Modified: 11-27-2007 | 1.6 C | |
| Service Category: Vehicle Interior | Section: Supplemental Restraint Systems | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000001582017X |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION SYSTEM: DESCRIPTION (2008 LX570) | ||
|
DTC |
B1795 |
Occupant Classification ECU Malfunction |
DESCRIPTION
DTC B1795 is stored when a malfunction is detected in the occupant classification ECU.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1795 |
An occupant classification ECU malfunction. |
No. 1 seat cushion assembly (occupant classification ECU) |
HINT:
When DTC B1650 is stored as a result of troubleshooting for the "Airbag System", check the DTCs stored in the occupant classification ECU. When DTC B1795 is output, perform troubleshooting for it first.
INSPECTION PROCEDURE
NOTICE:
-
w/ Navigation system:
After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.
-
When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected
.
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 fall down.
PROCEDURE
|
1. |
CHECK FOR DTC |
(a) Turn the engine switch on (IG).
(b) Clear the DTCs stored in the occupant classification ECU
.
(c) Clear the DTCs stored in the center airbag sensor
.
(d) Turn the engine switch off.
(e) Turn the engine switch on (IG), and wait for at least 10 seconds.
(f) Check for DTCs
.
OK:
DTC B1795 is not output.
HINT:
Codes other than DTC B1795 may be output at this time, but they are not related to this check.
|
|
2. |
REPLACE NO. 1 SEAT CUSHION ASSEMBLY (OCCUPANT CLASSIFICATION ECU) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Using the Techstream, save the ECU data from the ECU which is installed in the vehicle
.
(d) Turn the engine switch off.
(e) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(f) Replace the No. 1 seat cushion (occupant classification ECU)
.
(g) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(h) Turn the engine switch on (IG).
(i) Using the Techstream, load the previous ECU data stored in the Techstream into the new ECU
.
(j) Turn the engine switch off.
(k) Turn the engine switch on (IG).
(l) Clear the DTCs stored in the memory
.
HINT:
If DTCs are not cleared at this time, past DTCs will remain.
|
|
3. |
PERFORM ZERO POINT CALIBRATION |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Using the Techstream, perform zero point calibration
.
(d) Turn the engine switch off.
(e) Turn the engine switch on (IG).
(f) Clear the DTCs stored in the occupant classification ECU
.
HINT:
If the DTCs are not cleared at this time, past DTCs will remain.
|
|
4. |
PERFORM SENSITIVITY CHECK |
(a) Perform the sensitivity check
.
|
|
|