| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM10000000259TU |
| Model Year Start: 2023 | Model: GR Corolla | Prod Date Range: [09/2022 - 11/2022] |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION SYSTEM (for TMMMS Made): B1785; Front Occupant Classification Sensor LH Collision Detection; 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022] | ||
|
DTC |
B1785 |
Front Occupant Classification Sensor LH Collision Detection |
DESCRIPTION
DTC B1785 is stored when the occupant detection ECU receives a collision detection signal sent by the front occupant classification sensor LH in the case of an accident.
DTC B1785 is also stored when the front seat assembly RH is subjected to a strong impact, even if an actual accident did not occur.
If the vehicle was not in a collision, but the occupant detection ECU receives a collision detection signal and stores DTC B1785, the DTC can be cleared by performing zero point calibration. Therefore, if DTC B1785 is output, first perform zero point calibration.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
B1785 |
Front Occupant Classification Sensor LH Collision Detection |
|
Front occupant classification sensor LH (Separate type front seat cushion spring assembly RH) |
CAUTION / NOTICE / HINT
NOTICE:
-
When this DTC is stored, repair of the malfunction indicated can only be performed by initializing the occupant detection ECU, or replacing the separate type front seat cushion spring assembly RH. Do not replace the occupant detection ECU to repair the malfunction indicated by this DTC.
If the occupant detection ECU is replaced, this DTC will not be output but the occupant detection system may not function properly.
-
After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
Click here
![2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - ]; SETUP: WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL: BEFORE DISCONNECTING BATTERY](/t3Portal/stylegraphics/info.gif)
HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
Click here
HINT:
When DTC B165A is stored as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant detection ECU. When DTC B1785 is output, perform troubleshooting for this DTC first.
PROCEDURE
|
1. |
PERFORM ZERO POINT CALIBRATION |
(a) Using the Techstream, perform Zero Point Calibration.
Click here
OK:
"Zero Point Calibration is complete." is displayed.
| NG |
|
|
|
2. |
CHECK DTC |
(a) Turn the ignition switch to ON, and wait for at least 60 seconds.
(b) Clear the DTCs stored in the occupant detection ECU.
Body Electrical > Occupant Detection > Clear DTCs
(c) Clear the DTCs stored in the airbag sensor assembly.
Body Electrical > SRS Airbag > Clear DTCs
(d) Turn the ignition switch off.
(e) Turn the ignition switch to ON, and wait for at least 10 seconds.
(f) Check for DTCs.
Body Electrical > Occupant Detection > Trouble Codes
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.
(g) Turn the ignition switch off.
| OK |
|
END |
|
|
3. |
REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY RH |
(a) Turn the ignition switch off.
(b) Disconnect the cable from the negative (-) battery terminal.
(c) Replace the separate type front seat cushion spring assembly RH.
Click here
(d) Connect the cable to the negative (-) battery terminal.
|
|
4. |
PERFORM ZERO POINT CALIBRATION |
(a) Using the Techstream, perform Zero Point Calibration.
Click here
| NEXT |
|
END |
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