B1788

SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: B1788: Rear Occupant Classification Sensor RH Collision Detection

DTC B1788 - Rear Occupant Classification Sensor RH Collision Detection

DESCRIPTION

DTC B1788 is output when the occupant classification ECU receives a collision detection signal sent by the rear occupant classification sensor RH if an accident occurs.
DTC B1788 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 B1788 can be cleared by "zero point calibration" and "sensitivity check".
Therefore, if DTC B1788 is output, first perform "zero point calibration" and "sensitivity check".





HINT: When DTC B1150/23 is detected as a result of troubleshooting for Airbag System, check the DTCs stored in the occupant classification ECU. When DTC B1788 is output, perform troubleshooting for the DTC.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ZERO POINT CALIBRATION
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Using the intelligent tester, perform "zero point calibration" .
OK:
"COMPLETED" is displayed.
NG -- REPLACE FRONT SEAT ASSEMBLY RH
OK -- Continue to next step.
2. PERFORM SENSITIVITY CHECK
(a) Using the intelligent tester, perform "sensitivity check" .
Standard values:
27 to 33 kg (59.52 to 72.75 lb)
NG -- REPLACE FRONT SEAT ASSEMBLY RH
OK -- Continue to next step.
3. CHECK DTC
(a) Turn the ignition switch to the ON position.
(b) Clear the DTCs stored in the occupant classification ECU .
(c) Clear the DTCs stored in the center airbag sensor assembly .
(d) Turn the ignition switch to the LOCK position.
(e) Turn the ignition switch to the ON position.
(f) Check the DTCs .
OK:
DTC B1788 is not output.
HINT: Codes other than DTC B1788 may be output at this time, but they are not related to this check.

OK -- END
NG -- Continue to next step.
4. REPLACE FRONT SEAT ASSEMBLY RH
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Replace the front seat assembly RH .
HINT: Perform the inspection using parts from a normal vehicle if possible.

NEXT -- Continue to next step.
5. PERFORM ZERO POINT CALIBRATION
(a) Connect the negative (-) terminal cable to the battery.
(b) Connect the intelligent tester to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Using the intelligent tester, perform "zero point calibration" .
OK:
"COMPLETED" is displayed.
NG -- REPLACE OCCUPANT CLASSIFICATION ECU
OK -- Continue to next step.
6. PERFORM SENSITIVITY CHECK
(a) Using the intelligent tester, perform "sensitivity check" .
Standard values:
27 to 33 kg (59.52 to 72.75 lb)
NG -- REPLACE OCCUPANT CLASSIFICATION ECU
OK -- Continue to next step.
7. CHECK DTC
(a) Turn the ignition switch to the ON position.
(b) Clear the DTCs stored in the occupant classification ECU .
(c) Clear the DTCs stored in the center airbag sensor assembly .
(d) Turn the ignition switch to the LOCK position.
(e) Turn the ignition switch to the ON position.
(f) Check the DTCs .
OK:
DTC B1788 is not output.
HINT: Codes other than DTC B1788 may be output at this time, but they are not related to this check.

OK -- END
NG -- Continue to next step.
8. REPLACE OCCUPANT CLASSIFICATION ECU
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Replace the occupant classification ECU .
NEXT -- Continue to next step.
9. PERFORM ZERO POINT CALIBRATION
(a) Connect the negative (-) terminal cable to the battery.
(b) Connect the intelligent tester to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Using the intelligent tester, perform "zero point calibration" .
OK:
"COMPLETED" is displayed.
NEXT -- Continue to next step.
10. PERFORM SENSITIVITY CHECK
(a) Using the intelligent tester, perform "sensitivity check" .
Standard values:
27 to 33 kg (59.52 to 72.75 lb)
NEXT -- END