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B1787








SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: B1787: Rear Occupant Classification Sensor LH Collision Detection

DTC B1787 - Rear Occupant Classification Sensor LH Collision Detection

DESCRIPTION

DTC B1787 is set when the occupant classification ECU receives a collision detection signal, which is sent by the rear occupant classification sensor LH when an accident occurs.
DTC B1787 is also set when the front seat frame with adjuster RH is subjected to a strong impact, even if an actual accident has not occurred.
However, when the occupant classification ECU outputs a collision detection signal, even if the vehicle is not in a collision, DTC B1787 can be cleared by conducting the zero point calibration and sensitivity check.
Therefore, if DTC B1787 is output, first perform the zero point calibration and sensitivity check.





HINT:
- When DTC B1650/32 is set as a result of troubleshooting the airbag system, perform troubleshooting for DTC B1787 of the occupant classification system.
- Use a Techstream to check for DTCs of the occupant classification ECU, otherwise the DTCs cannot be read.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC
(a) Turn the ignition switch ON, and wait for at least 60 seconds.
(b) Clear any DTCs stored in the center airbag sensor.
(c) Turn the ignition switch off.
(d) Turn the ignition switch ON, and wait for at least 60 seconds.
(e) Using a Techstream, check for DTCs of the occupant classification ECU .
OK:
DTC B1787 is not output.
HINT: DTCs other than DTC B1787 may be output at this time, but they are not related to this check.

NG -- PERFORM ZERO POINT CALIBRATION
OK -- USE SIMULATION METHOD TO CHECK
2. PERFORM ZERO POINT CALIBRATION
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch ON, and wait for at least 60 seconds.
(c) Using the Techstream, perform the zero point calibration .
NG -- REPLACE FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY RH
OK -- Continue to next step.
3. PERFORM SENSITIVITY CHECK
(a) Using a Techstream, perform the sensitivity check .
Standard range:
27 to 33 kg (59.5 to 72.8 lb)
NG -- REPLACE FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY RH
OK -- Continue to next step.
4. CHECK FOR DTC
(a) Turn the ignition switch ON, and wait for at least 60 seconds.
(b) Clear any DTCs stored in the center airbag sensor .
(c) Turn the ignition switch off.
(d) Turn the ignition switch ON, and wait for at least 60 seconds.
(e) Using a Techstream, check for DTCs of the occupant classification ECU .
OK:
DTC B1787 is not output.
HINT: DTCs other than DTC B1787 may be output at this time, but they are not related to this check.

NG -- REPLACE FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY RH
OK -- END
5. REPLACE FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY RH
(a) Turn the ignition switch off.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Replace the front seat frame with adjuster RH .
HINT: Perform the inspection using parts from a normal vehicle when possible.

NEXT -- Continue to next step.
6. PERFORM ZERO POINT CALIBRATION
(a) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(b) Connect a Techstream to the DLC3.
(c) Turn the ignition switch ON, and wait for at least 60 seconds.
(d) Using the Techstream, perform the zero point calibration .
NG -- REPLACE OCCUPANT CLASSIFICATION ECU
OK -- Continue to next step.
7. PERFORM SENSITIVITY CHECK
(a) Using a Techstream, perform the sensitivity check .
Standard range:
27 to 33 kg (59.5 to 72.8 lb)
NG -- REPLACE OCCUPANT CLASSIFICATION ECU
OK -- Continue to next step.
8. CHECK FOR DTC
(a) Connect the connectors to the occupant classification ECU and the rear occupant classification sensor LH.
(b) Turn the ignition switch ON, and wait for at least 60 seconds.
(c) Clear any DTCs stored in the memory .
HINT:
- First clear DTCs stored in the occupant classification ECU and then in the center airbag sensor.
- Use a Techstream to clear the DTCs of the occupant classification ECU, otherwise the DTCs cannot be cleared.
(d) Turn the ignition switch off.
(e) Turn the ignition switch ON, and wait for at least 60 seconds.
(f) Using the Techstream, check for DTCs of the occupant classification ECU .
OK:
DTC B1787 is not output.
HINT: DTCs other than DTC B1787 may be output at this time, but they are not related to this check.

NG -- REPLACE OCCUPANT CLASSIFICATION ECU
OK -- END
9. REPLACE OCCUPANT CLASSIFICATION ECU
(a) Turn the ignition switch off.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Replace the occupant classification ECU .
HINT: Perform the inspection using parts from a normal vehicle when possible.

NEXT -- Continue to next step.
10. PERFORM ZERO POINT CALIBRATION
(a) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(b) Connect a Techstream to the DLC3.
(c) Turn the ignition switch ON, and wait for at least 60 seconds.
(d) Using the Techstream, perform the zero point calibration .
NEXT -- Continue to next step.
11. PERFORM SENSITIVITY CHECK
(a) Using a Techstream, perform the sensitivity check .
Standard range:
27 to 33 kg (59.5 to 72.8 lb)
NEXT -- END
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