2006-2008 Toyota Matrix Service & Repair Manual

SUPPLEMENTAL RESTRAINT SYSTEM – OCCUPANT CLASSIFICATION SYSTEM RS–241 RS 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 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 B1786 can be cleared by "Zero point calibration" and "Sensitivity check". Therefore, if DTC B1786 is output, first perform "Zero point calibration" and "Sensitivity check". WIRING DIAGRAM See page RS-213. INSPECTION PROCEDURE (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" (See page RS-187). OK: "COMPLETED" is displayed. NG OK (a) Using the intelligent tester, perform "Sensitivity check" (See page RS-187). Standard value: 27 to 33 kg (59.52 to 72.75 lb) NG OK (a) Turn the ignition switch to the ON position. (b) Clear the DTCs stored in the memory (See page RS- 194). DTC B1786 Front Occupant Classification Sensor RH Colli- sion Detection DTC No. DTC Detection Condition Trouble Area B1786 • Front seat back assembly RH malfunction • Occupant classification ECU malfunction • Front occupant classification sensor RH detected a large load • Front seat back assembly RH (Front occupant classification sensor RH) • Occupant classification ECU 1 PERFORM ZERO POINT CALIBRATION Go to step 4 2 PERFORM SENSITIVITY CHECK Go to step 4 3 CHECK DTC

RS–242 SUPPLEMENTAL RESTRAINT SYSTEM – OCCUPANT CLASSIFICATION SYSTEM RS HINT: First clear DTCs stored in the occupant classification ECU and then in the center airbag sensor assembly. (c) Turn the ignition switch to the LOCK position. (d) Turn the ignition switch to the ON position. (e) Check the DTCs (See page RS-194). OK: DTC B1786 is not output. HINT: Codes other than DTC B1786 may be output at this time, but they are not related to this check. OK NG (a) Turn the ignition switch to the LOCK position. (b) Disconnect the negative (-) terminal cable from the battery. (c) Replace the front seat assembly RH (See page SE-12). HINT: Perform the inspection using parts from a normal vehicle if possible. NEXT (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" (See page RS-187). OK: "COMPLETED" is displayed. NG OK (a) Using the intelligent tester, perform "Sensitivity check" (See page RS-187). Standard value: 27 to 33 kg (59.52 to 72.75 lb) NG OK END 4 REPLACE FRONT SEAT BACK ASSEMBLY RH 5 PERFORM ZERO POINT CALIBRATION Go to step 8 6 PERFORM SENSITIVITY CHECK Go to step 8

SUPPLEMENTAL RESTRAINT SYSTEM – OCCUPANT CLASSIFICATION SYSTEM RS–243 RS (a) Turn the ignition switch to the ON position. (b) Clear the DTCs stored in the memory (See page RS- 194). HINT: First clear DTCs stored in the occupant classification ECU and then in the center airbag sensor assembly. (c) Turn the ignition switch to the LOCK position. (d) Turn the ignition switch to the ON position. (e) Check the DTCs (See page RS-194). OK: DTC B1786 is not output. HINT: Codes other than DTC B1786 may be output at this time, but they are not related to this check. OK NG (a) Turn the ignition switch to the LOCK position. (b) Disconnect the negative (-) terminal cable from the battery. (c) Replace the occupant classification ECU (See page RS- 332). NEXT (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" (See page RS-187). OK: "COMPLETED" is displayed. NEXT (a) Using the intelligent tester, perform "Sensitivity check" (See page RS-187). Standard value: 27 to 33 kg (59.52 to 72.75 lb) 7 CHECK DTC END 8 REPLACE OCCUPANT CLASSIFICATION ECU 9 PERFORM ZERO POINT CALIBRATION 10 PERFORM SENSITIVITY CHECK

RS–244 SUPPLEMENTAL RESTRAINT SYSTEM – OCCUPANT CLASSIFICATION SYSTEM RS NEXT END

2006-2008 Toyota Matrix Service & Repair Manual

You're Reading a Preview

Recently Viewed