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:
Disassembly
DISASSEMBLY
PROCEDURE
1. REMOVE NO. 1 ULTRASONIC SENSOR (w/ Intuitive Parking Assist System)
2. REMOVE NO. 2 ULTRASONIC SENSOR RETAINER (w/ Intuitive Parking Assist System)
3. REMOVE FRONT LICENSE PLATE BRACKET
(a) Remove the 2 screws and ...
Installation
INSTALLATION
CAUTION / NOTICE / HINT
HINT:
When installing the mouldings, heat the vehicle body and mouldings using a heat
light.
Heating Temperature
Item
Temperature
Vehicle Body
40 to 60°C (104 to 140 ...
Initialization has not been Performed (B2450)
DESCRIPTION
The headlight leveling ECU assembly stores this DTC if initialization has not
been performed after the ECU was replaced.
DTC No.
DTC Detecting Condition
Trouble Area
B2450
Initializat ...
0.1156