| Last Modified: 01-30-2024 | 6.11:8.1.0 | Doc ID: RM100000001HIBK |
| Model Year Start: 2019 | Model: RAV4 | Prod Date Range: [02/2019 - ] |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION SYSTEM: B1787; Rear Occupant Classification Sensor LH Collision Detection; 2019 - 2024 MY RAV4 RAV4 HV [02/2019 - ] | ||
|
DTC |
B1787 |
Rear Occupant Classification Sensor LH Collision Detection |
DESCRIPTION
DTC B1787 is stored when the occupant detection ECU receives a collision detection signal sent by the rear occupant classification sensor LH in the case of an accident.
DTC B1787 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 B1787, the DTC can be cleared by performing zero point calibration.
Therefore, if DTC B1787 is output, first perform zero point calibration.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
B1787 |
Rear Occupant Classification Sensor LH Collision Detection |
|
Front seat adjuster assembly RH (Rear occupant classification sensor LH)* |
- *: The rear occupant classification sensor LH is built into the front seat adjuster assembly RH.
CAUTION / NOTICE / HINT
CAUTION:
When this DTC is stored, repair of the malfunction indicated can only be performed by initializing the occupant detection ECU or replacing the front seat adjuster 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.
NOTICE:
-
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.
Click here
![2019 MY RAV4 RAV4 HV [02/2019 - 10/2019]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION](/t3Portal/stylegraphics/info.gif)
-
When disconnecting the cable from the negative (-) auxiliary battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.
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 B1787 is output, perform troubleshooting for this DTC first.
PROCEDURE
|
1. |
PERFORM ZERO POINT CALIBRATION |
(a) Using the Techstream, perform "Zero Point Calibration".
Click here
Body Electrical > Occupant Detection > Utility
|
Tester Display |
|---|
|
Zero Point Calibration |
OK:
"Zero Point Calibration is complete." is displayed.
| NG |
|
|
|
2. |
CHECK DTC |
(a) Clear the DTCs stored in the occupant detection ECU.
Click here
Body Electrical > Occupant Detection > Clear DTCs
(b) Clear the DTCs stored in the airbag ECU assembly.
Click here
Body Electrical > SRS Airbag > Clear DTCs
(c) Turn the ignition switch off.
(d) Turn the ignition switch to ON, and wait for at least 60 seconds.
(e) Check the DTCs stored in the occupant detection ECU.
Click here
Body Electrical > Occupant Detection > Trouble Codes
HINT:
Codes other than DTC B1785 may be output at this time, but they are not related to this check.
| DTC B1785 is not output. |
|
END (NORMAL AFTER PERFORMING ZERO POINT CALIBRATION) |
|
|
3. |
REPLACE FRONT SEAT ADJUSTER ASSEMBLY RH |
(a) Turn the ignition switch off.
(b) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.
(c) Replace the front seat adjuster assembly RH with a new one.
Click here
(d) Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
|
|
4. |
PERFORM ZERO POINT CALIBRATION |
(a) Using the Techstream, perform "Zero Point Calibration".
Click here
Body Electrical > Occupant Detection > Utility
|
Tester Display |
|---|
|
Zero Point Calibration |
| NEXT |
|
END (FRONT SEAT ADJUSTER ASSEMBLY RH WAS DEFECTIVE) |
|
|