Toyota Venza: Front Occupant Classification Sensor LH Collision Detection (B1785)
DESCRIPTION
DTC B1785 is output when the occupant classification ECU receives a collision detection signal sent by the front occupant classification sensor LH if an accident occurs.
DTC B1785 is also output when the front seat assembly RH is subjected to a strong impact, even if an actual accident does not occur.
However, when the occupant classification ECU outputs a collision detection signal, even if the vehicle is not in a collision, DTC B1785 can be cleared by Zero Point Calibration and Sensitivity Check.
Therefore, if DTC B1785 is output, first perform Zero Point Calibration and Sensitivity Check.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1785 |
|
|
HINT:
When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1785 is output, perform troubleshooting for the DTC.
WIRING DIAGRAM
PROCEDURE
|
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
.gif)
).
OK:
"Zero Point Calibration is complete." is displayed.
| NG | .gif) |
GO TO STEP 4 |
|
.gif)
|
2. |
PERFORM SENSITIVITY CHECK |
(a) Using the Techstream, perform Sensitivity Check (See page
).
Standard:
27 to 33 kg (59.5 to 72.8 lb)
| NG | |
GO TO STEP 4 |
|
|
3. |
CHECK DTC |
(a) Turn the ignition switch to ON.
(b) Clear the DTCs stored in the occupant classification ECU (See page
).
(c) Clear the DTCs stored in the center airbag sensor assembly (See page
).
(d) Turn the ignition switch off.
(e) Turn the ignition switch to ON.
(f) Check for DTCs (See page ).
OK:
DTC B1785 is not output.
HINT:
Codes other than DTC B1785 may be output at this time, but they are not related to this check.
| OK | |
END |
|
|
4. |
REPLACE FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY RH |
(a) Turn the ignition switch off.
(b) Disconnect the cable from the negative (-) battery terminal.
(c) Replace the front seat frame with adjuster assembly RH (See page
for power seat or
for manual seat).
HINT:
Perform the inspection using parts from a normal vehicle if possible.
|
|
5. |
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.
| NG | |
GO TO STEP 8 |
|
|
6. |
PERFORM SENSITIVITY CHECK |
(a) Using the Techstream, perform Sensitivity Check (See page
).
Standard:
27 to 33 kg (59.5 to 72.8 lb)
| NG | |
GO TO STEP 8 |
|
|
7. |
CHECK DTC |
(a) Turn the ignition switch to ON.
(b) Clear the DTCs stored in the occupant classification ECU (See page
).
(c) Clear the DTCs stored in the center airbag sensor assembly (See page
).
(d) Turn the ignition switch off.
(e) Turn the ignition switch to ON.
(f) Check for DTCs (See page ).
OK:
DTC B1785 is not output.
HINT:
Codes other than DTC B1785 may be output at this time, but they are not related to this check.
| OK | |
END |
|
|
8. |
REPLACE OCCUPANT CLASSIFICATION ECU |
(a) Turn the ignition switch off.
(b) Disconnect the cable from the negative (-) battery terminal.
(c) Replace the occupant classification ECU (See page
).
|
|
9. |
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.
|
|
10. |
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 |
Front Occupant Classification Sensor RH Collision Detection (B1786)
DESCRIPTION
DTC B1786 is output when the occupant classification ECU receives a collision
detection signal sent by the front occupant classification sensor RH if an accident
occurs.
DTC B1786 is ...
Rear Occupant Classification Sensor LH Circuit Malfunction (B1782)
DESCRIPTION
The rear occupant classification sensor LH circuit consists of the occupant classification
ECU and rear occupant classification sensor LH.
DTC B1782 is recorded when a malfunction is d ...
Other materials about Toyota Venza:
Removal
REMOVAL
PROCEDURE
1. REMOVE BRAKE BOOSTER ASSEMBLY
HINT:
Refer to the instructions for Removal of the brake booster assembly (See page
).
2. REMOVE HEADLIGHT LEVELING ECU ASSEMBLY (w/ HID Headlight System)
3. REMOVE STOP LIGHT SWITCH ASSEMBLY
4. ...
Operation Check
OPERATION CHECK
1. CHECK POWER DOOR LOCK CONTROL OPERATION
NOTICE:
The following procedure is based on the assumption that the functions have not
been customized using the Techstream.
(a) Check basic functions.
(1) Check that all doors lock when the loc ...
Clearance Warning Buzzer
Components
COMPONENTS
ILLUSTRATION
Removal
REMOVAL
PROCEDURE
1. REMOVE FRONT DOOR SCUFF PLATE LH
2. REMOVE COWL SIDE TRIM SUB-ASSEMBLY LH
3. REMOVE LOWER NO. 1 INSTRUMENT PANEL FINISH PANEL
4. REMOVE NO. 1 CLEARANCE WARNING BUZZER
...
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