Home ReviewsRefund
Home/Toyota/Tundra/Toyota Tundra II (2007-2013)/Repair manual/Restraints Control Systems/Occupant Classification System (Diagnostic Codes): Overview
Contents Wiring diagrams Section: Restraints Control Systems All sections

Occupant Classification System (Diagnostic Codes): Overview Toyota Tundra II

Restraints Control Systems 12 illustrations ~4584 words

DESCRIPTION

The passenger side buckle switch circuit consists of the occupant classification ECU and the front seat inner belt RH.

DTC B1771 is recorded when a malfunction is detected in the passenger side buckle switch circuit.

Troubleshoot DTC B1771 first when DTCs B1771 and B1795 are output simultaneously.

DTC CodeDTC Detection ConditionTrouble Area
B1771One of following conditions is met: Occupant classification ECU detects line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to +B signal in passenger side buckle switch circuit for 2 seconds Passenger side buckle switch malfunction Occupant classification ECU malfunctionFront seat wire RH Front seat inner belt RH (Passenger side buckle switch) Occupant classification ECU

HINT

  1. When DTC B1650/32 is detected as a result of troubleshooting the airbag system, perform troubleshooting for DTC B1771 of the occupant classification system.
  2. Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTC cannot be read.

Scheme 116

Scheme 116: WIRING DIAGRAM
Scheme 116: WIRING DIAGRAM

The front occupant detection sensor LH circuit consists of the occupant classification ECU and the front occupant detection sensor LH.

DTC B1780 is set when a malfunction is detected in the front occupant detection sensor LH circuit.

DTC CodeDTC Detection ConditionTrouble Area
B1780One of following conditions is met: Occupant classification ECU receives line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to +B signal in front occupant detection sensor LH circuit for 2 seconds Front occupant detection sensor LH malfunction Occupant classification ECU malfunctionFront seat frame with adjuster RH (Front occupant detection sensor LH) Front seat wire RH Occupant classification ECU

HINT

  1. When DTC B1650/32 is detected as a result of troubleshooting the airbag system, perform troubleshooting for DTC B1780 of the occupant classification system.
  2. Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTC cannot be read.

Scheme 117

Scheme 117: WIRING DIAGRAM
Scheme 117: WIRING DIAGRAM

The front occupant detection sensor RH circuit consists of the occupant classification ECU and the front occupant detection sensor RH.

DTC B1781 is set when a malfunction is detected in the front occupant detection sensor RH circuit.

DTC CodeDTC Detection ConditionTrouble Area
B1781One of following conditions is met: Occupant classification ECU receives line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to +B signal in front occupant detection sensor RH circuit for 2 seconds Front occupant detection sensor RH malfunction Occupant classification ECU malfunctionFront seat frame with adjuster RH (Front occupant detection sensor RH) Front seat wire RH Occupant classification ECU

HINT

  1. When DTC B1650/32 is detected as a result of troubleshooting the airbag system, perform troubleshooting for DTC B1781 of the occupant classification system.
  2. Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTC cannot be read.

Scheme 118

Scheme 118: WIRING DIAGRAM
Scheme 118: WIRING DIAGRAM

The rear occupant detection sensor LH circuit consists of the occupant classification ECU and the rear occupant detection sensor LH.

DTC B1782 is set when a malfunction is detected in the rear occupant detection sensor LH circuit.

DTC CodeDTC Detection ConditionTrouble Area
B1782One of following conditions is met: Occupant classification ECU receives line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in rear occupant detection sensor LH circuit for 2 seconds Rear occupant detection sensor LH malfunction Occupant classification ECU malfunctionFront seat frame with adjuster RH (Rear occupant detection sensor LH) Front seat wire RH Occupant classification ECU

HINT

  1. When DTC B1650/32 is detected as a result of troubleshooting the airbag system, perform troubleshooting for DTC B1782 of the occupant classification system.
  2. Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTCs cannot be read.

Scheme 119

Scheme 119: WIRING DIAGRAM
Scheme 119: WIRING DIAGRAM

The rear occupant detection sensor RH circuit consists of the occupant classification ECU and the rear occupant detection sensor RH.

DTC B1783 is set when a malfunction is detected in the rear occupant detection sensor RH circuit.

DTC CodeDTC Detection ConditionTrouble Area
B1783One of following conditions is met: Occupant classification ECU receives line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to +B signal in rear occupant detection sensor RH circuit for 2 seconds Rear occupant detection sensor RH malfunction Occupant classification ECU malfunctionFront seat frame with adjuster RH (Rear occupant detection sensor RH) Front seat wire wire RH Occupant classification ECU

HINT

  1. When DTC B1650/32 is detected as a result of troubleshooting the airbag system, perform troubleshooting for DTC B1783 of the occupant classification system.
  2. Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTCs cannot be read.

Scheme 120

Scheme 120: WIRING DIAGRAM
Scheme 120: WIRING DIAGRAM

DTC B1785 is set when the occupant classification ECU receives a collision detection signal, which is sent by the front occupant detection sensor LH when an accident occurs.

DTC B1785 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 B1785 can be cleared by conducting the zero point calibration and sensitivity check.

Therefore, if DTC B1785 is set, first perform the zero point calibration and sensitivity check.

DTC CodeDTC Detection ConditionTrouble Area
B1785Either of following conditions is met: Occupant classification ECU receives collision detection signal, which is sent by front occupant detection sensor LH when accident occurs Front seat frame with adjuster RH is subjected to strong impact, even if actual accident has not occurredFront seat frame with adjuster RH (Front occupant detection sensor LH) Occupant classification ECU

HINT

  1. When DTC B1650/32 is set as a result of troubleshooting the airbag system, perform troubleshooting for DTC B1785 of the occupant classification system.
  2. Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTCs cannot be read.

DTC B1786 is set when the occupant classification ECU receives a collision detection signal, which is sent by the front occupant detection sensor RH when an accident occurs.

DTC B1786 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 B1786 can be cleared by conducting the zero point calibration and sensitivity check.

Therefore, if DTC B1786 is set, first perform the zero point calibration and sensitivity check.

DTC CodeDTC Detection ConditionTrouble Area
B1786Either of following conditions is met: Occupant classification ECU receives collision detection signal, which is sent by front occupant detection sensor RH when accident occurs Front seat frame with adjuster RH is subjected to strong impact, even if actual accident has not occurredFront seat frame with adjuster RH (Front occupant detection sensor RH) Occupant classification ECU

HINT

  1. When DTC B1650/32 is set as a result of troubleshooting the airbag system, perform troubleshooting for DTC B1786 of the occupant classification system.
  2. Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTCs cannot be read.

DTC B1787 is set when the occupant classification ECU receives a collision detection signal, which is sent by the rear occupant detection 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.

DTC CodeDTC Detection ConditionTrouble Area
B1787Either of following conditions is met: Occupant classification ECU receives collision detection signal, which is sent by rear occupant detection sensor LH when accident occurs Front seat frame with adjuster RH is subjected to strong impact, even if actual accident has not occurredFront seat frame with adjuster RH (Rear occupant detection sensor LH) Occupant classification ECU

HINT

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

DTC B1788 is set when the occupant classification ECU receives a collision detection signal, which is sent by the occupant detection sensor rear RH when an accident occurs.

DTC B1788 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 B1788 can be cleared by conducting the zero point calibration and sensitivity check.

Therefore, if DTC B1788 is output, first perform the zero point calibration and sensitivity check.

DTC CodeDTC Detection ConditionTrouble Area
B1788Either of following conditions is met: Occupant classification ECU receives collision detection signal, which is sent by occupant detection sensor rear RH when accident occurs Front seat frame with adjuster RH is subjected to strong impact, even if actual accident has not occurredFront seat frame with adjuster RH (Rear occupant detection sensor RH) Occupant classification ECU

HINT

  1. When DTC B1650/32 is set as a result of troubleshooting the airbag system, perform troubleshooting for DTC B1788 of the occupant classification system.
  2. Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTCs cannot be read.

The center airbag sensor communication circuit consists of the occupant classification ECU and the center airbag sensor.

DTC B1790 is set when a malfunction is detected in the center airbag sensor communication circuit.

DTC CodeDTC Detection ConditionTrouble Area
B1790One of following conditions is met: Occupant classification ECU receives line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to +B signal in center airbag sensor communication circuit for 2 seconds Center airbag sensor malfunction Occupant classification ECU malfunctionNo. 2 floor wire Front seat wire RH Occupant classification ECU Center airbag sensor

HINT

  1. When DTC B1630/32 is detected as a result of troubleshooting the airbag system, perform troubleshooting for DTC B1790 of the occupant classification system.
  2. Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTCs cannot be read.

Scheme 121

Scheme 121: WIRING DIAGRAM
Scheme 121: WIRING DIAGRAM

The occupant detection sensor power supply circuit consists of the occupant classification ECU and the occupant detection sensors.

DTC B1793 is set when a malfunction is detected in the occupant detection sensor power supply circuit.

DTC CodeDTC Detection ConditionTrouble Area
B1793One of following conditions is met: Occupant classification ECU receives line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to +B signal in occupant detection sensor power supply circuit for 2 seconds Open circuit in occupant detection sensor wire harness Occupant classification ECU malfunctionFront seat frame with adjuster RH (Occupant detection sensors) Front seat wire RH Occupant classification ECU

HINT

  1. When DTC B1650/32 is detected as a result of troubleshooting the airbag system, perform troubleshooting for DTC B1793 of the occupant classification system.
  2. Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTCs cannot be read.

Scheme 122

Scheme 122: WIRING DIAGRAM
Scheme 122: WIRING DIAGRAM

DTC B1794 is set when a malfunction is detected in the occupant classification ECU.

DTC CodeDTC Detection ConditionTrouble Area
B1794One of following conditions is met: Occupant classification ECU circuit malfunction Occupant classification ECU malfunction Occupant classification ECU receives short circuit to ground signal in passenger side buckle switch circuit for 2 secondsHarness or connector Occupant classification ECU

HINT

  1. When DTC B1650/32 is detected as a result of troubleshooting the airbag system, perform troubleshooting for DTC B1794 of the occupant classification system.
  2. Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTCs cannot be read.

Scheme 123

Scheme 123: WIRING DIAGRAM
Scheme 123: WIRING DIAGRAM

Scheme 124

Scheme 124: PROCEDURE
Scheme 124: PROCEDURE
  1. CHECK FOR DTC Turn the ignition switch ON, and wait for at least 60 seconds. Clear any DTCs stored in the memory. Refer to «DTC CHECK / CLEAR»(ref-389466-S36147380192011032200000) . HINT: First clear DTCs stored in the occupant classification ECU and then in the center airbag sensor. Use the Techstream to clear the DTCs of the occupant classification ECU, otherwise the DTCs cannot be cleared. Turn the ignition switch OFF, and wait for at least 10 seconds. Turn the ignition switch ON, and wait for at least 60 seconds. Using the Techstream, check for DTCs of the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-389466-S36147380192011032200000) . OK DTC B1794 is not output. HINT: DTCs other than DTC B1794 may be output at this time, but they are not related to this check. NG --> Go to next step OK --> See step 9
  2. CHECK CONNECTION OF CONNECTOR Turn the ignition switch OFF. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds. Check that the connectors are properly connected to the center airbag sensor, occupant detection sensors and occupant classification ECU. OK Connectors are properly connected. NG --> CONNECT CONNECTOR OK: Go to next step
  3. CHECK CONNECTOR Check that the connectors (on the occupant classification ECU side) are not damaged. Refer to «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-389124-S01101719472011032200000) . OK Connectors are not deformed or damaged. NG --> REPLACE HARNESS OR CONNECTOR OK: Go to next step
  4. CHECK HARNESS AND CONNECTOR (SOURCE VOLTAGE) Turn the ignition switch OFF. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds. Disconnect the Y2*1 or Q11*2 ECU connector. HINT: *1: for Power Seat *2: for Manual Seat Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds. Turn the ignition switch ON, and wait for at least 60 seconds. Measure the resistance and voltage according to the value(s) in the table below. Standard resistance for Power Seat for Manual Seat Tester Connection Condition Specified Condition Y2-3 (GND) - Body ground Always Below 1 ohms Tester Connection Condition Specified Condition Q11-3 (GND) - Body ground Always Below 1 ohms Standard voltage for Power Seat for Manual Seat Tester Connection Switch Condition Specified Condition Y2-1 (+B) - Body ground Ignition switch ON 11 to 14 V Y2-7 (IG) - Body ground Tester Connection Switch Condition Specified Condition Q11-1 (+B) - Body ground Ignition switch ON 11 to 14 V Q11-7 (IG) - Body ground NG --> REPLACE HARNESS OR CONNECTOR OK: Go to next step
  5. CHECK FOR DTC Turn the ignition switch OFF. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds. Connect the connectors to the occupant classification ECU. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds. Turn the ignition switch ON, and wait for at least 60 seconds. Clear any DTCs stored in the memory. Refer to «DTC CHECK / CLEAR»(ref-389466-S36147380192011032200000) . HINT: First clear DTCs stored in the occupant classification ECU and then in the center airbag sensor. Use the Techstream to clear the DTCs of the occupant classification ECU, otherwise the DTCs cannot be cleared. Turn the ignition switch OFF, and wait for at least 10 seconds. Turn the ignition switch ON, and wait for at least 60 seconds. Using the Techstream, check for DTCs of the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-389466-S36147380192011032200000) . OK DTC B1794 is not output. HINT: DTCs other than DTC B1794 may be output at this time, but they are not related to this check. NG --> Go to next step OK --> See step 9
  6. REPLACE OCCUPANT CLASSIFICATION ECU Turn the ignition switch OFF. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds. Replace the occupant classification ECU. for Manual Seat. Refer to «DISASSEMBLY»(ref-389422-S26760409282011032200000) for Power Seat. Refer to «DISASSEMBLY»(ref-389422-S37743958112011032200000) HINT: Perform the inspection using parts from a normal vehicle when possible. NEXT: Go to next step
  7. PERFORM ZERO POINT CALIBRATION Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds. Connect the Techstream to the DLC3. Turn the ignition switch ON, and wait for at least 60 seconds. Using the Techstream, perform the zero point calibration. Refer to «INITIALIZATION»(ref-389466-S10312972172011032200000) . NEXT: Go to next step
  8. PERFORM SENSITIVITY CHECK Using the Techstream, perform the sensitivity check. Refer to «INITIALIZATION»(ref-389466-S10312972172011032200000) . Standard range 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END
  9. USE SIMULATION METHOD TO CHECK. Refer to «DIAGNOSIS SYSTEM»(ref-389466-S11562162802011032200000)

DTC B1795 is set when a malfunction is detected in the occupant classification ECU.

Troubleshoot DTC B1771 first when both DTCs B1771 and B1795 are present.

DTC CodeDTC Detection ConditionTrouble Area
B1795Occupant classification ECU malfunctionOccupant classification ECU

HINT

  1. When DTC B1650/32 is detected as a result of troubleshooting the airbag system, perform troubleshooting for DTC B1795 of the occupant classification system.
  2. Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTCs cannot be read.

During sleep mode, the occupant classification ECU monitors the condition of each sensor while the ignition switch is OFF. In this mode, if the occupant classification ECU detects an internal malfunction, DTC B1796 is set.

DTC CodeDTC Detection ConditionTrouble Area
B1796Occupant classification ECU malfunctionOccupant classification ECU

HINT

  1. When DTC B1650/32 is detected as a result of troubleshooting the airbag system, perform troubleshooting for DTC B1796 of the occupant classification system.
  2. Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTCs cannot be read.

The passenger airbag ON/OFF indicator consists of the center airbag sensor assembly, occupant classification ECU, hazard warning switch assembly, and 4 occupant classification sensors. This system controls the passenger airbag deployment according to the occupancy condition of the front passenger seat, and also displays those detected conditions.

Scheme 125

Scheme 125: WIRING DIAGRAM
Scheme 125: WIRING DIAGRAM

Scheme 126

Scheme 126: PROCEDURE
Scheme 126: PROCEDURE

Scheme 127

Scheme 127
Scheme 127
  1. CHECK VEHICLE TYPE Proceed to the appropriate step according to the table below. RESULT Result Proceed to w/o Passenger airbag cut-off switch A w/ Passenger airbag cut-off switch B B --> See step 13 A: Go to next step
  2. RETIGHTEN FRONT SEAT ASSEMBLY RH BOLT Turn the ignition switch OFF. Loosen the 4 installation bolts of the front seat RH. Tighten the 4 installation bolts of the front seat RH to the specified torque. for Manual Seat. Refer to «INSTALLATION»(ref-389422-S30234758812011032200000) for Power Seat. Refer to «INSTALLATION»(ref-389422-S30122868692011032200000) Torque: 37 N*m (377 kgf*cm, 27 ft.*lbf) NEXT: Go to next step
  3. PERFORM ZERO POINT CALIBRATION Connect the Techstream to the DLC3. Turn the ignition switch ON, and wait for at least 60 seconds. Using the Techstream, perform the zero point calibration. Refer to «INITIALIZATION»(ref-389466-S10312972172011032200000) . OK Zero point calibration is completed using tester. NG --> Go to next step OK --> END
  4. READ VALUE USING TECHSTREAM (PASSENGER SIDE BUCKLE SWITCH) Turn the ignition switch ON, and wait for at least 60 seconds. Using the Techstream, read the "Data List". Refer to «DATA LIST / ACTIVE TEST»(ref-389466-S03856397302011032200000) . OCCUPANT DETECTION: Tester Display Measure Item / Range Normal Condition Diagnostic Note Passenger Buckle SW Passenger side buckle switch / Set, Unset or NG Set: Passenger side seat belt is fastened Unset: Passenger side seat belt is unfastened NG: Passenger side seat belt is malfunctioning - OK Display changed correctly according to operation of buckle switch. NG --> See step 9 OK: Go to next step
  5. READ VALUE USING TECHSTREAM (OCCUPANT DETECTION SENSOR) Fasten the passenger side seat belt. Turn the ignition switch ON, and wait for at least 60 seconds. Using the Techstream, read the "Data List". Refer to «DATA LIST / ACTIVE TEST»(ref-389466-S03856397302011032200000) . OCCUPANT DETECTION: Tester Display Test Part Control Range Diagnostic Note FL Sensor Voltage Front left sensor voltage/ Min.: 0 V Max.: 19.8 V 0 to 4.7 V - FR Sensor Voltage Front right sensor voltage/ Min.: 0 V Max.: 19.8 V 0 to 4.7 V - RL Sensor Voltage Rear left sensor voltage/ Min.: 0 V Max.: 19.8 V 0 to 4.7 V - RR Sensor Voltage Rear right sensor voltage/ Min.: 0 V Max.: 19.8 V 0 to 4.7 V - FL Sensor Weight Info Front left sensor weight information/ Min.: -17 kg (-37.48 lb) Max.: 27 kg (59.52 lb) -17 to 27 kg (-37.48 to 59.52 lb) - FR Sensor Weight Info Front right sensor weight information/ Min.: -17 kg (-37.48 lb) Max.: 27 kg (59.52 lb) -17 to 27 kg (-37.48 to 59.52 lb) - RL Sensor Weight Info Rear left sensor weight information/ Min.: -17 kg (-37.48 lb) Max.: 37 kg (81.57 lb) -17 to 37 kg (-37.48 to 81.57 lb) - RR Sensor Weight Info Rear right sensor weight information/ Min.: -17 kg (-37.48 lb) Max.: 37 kg (81.57 lb) -17 to 37 kg (-37.48 to 81.57 lb) - Total Weight Information Total weight information/ Min.: -68 kg (-149.91 lb) Max.: 128 kg (282.19 lb) -68 to 128 kg (-149.91 to 282.19 lb) - RESULT Result Proceed to Display is as specified in normal condition A Display is not as specified in normal condition (for Manual Seat) B Display is not as specified in normal condition (for Power Seat) C C --> See step 30 B --> See step 29 A: Go to next step
  6. REPLACE FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY RH Turn the ignition switch OFF. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds. Replace the front seat frame with adjuster RH. Refer to «INITIALIZATION»(ref-389466-S10312972172011032200000) . HINT: Perform the inspection using parts from a normal vehicle when possible. NEXT: Go to next step
  7. PERFORM ZERO POINT CALIBRATION Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds. Connect the Techstream to the DLC3. Turn the ignition switch ON, and wait for at least 60 seconds. Using the Techstream, perform the zero point calibration. Refer to «INITIALIZATION»(ref-389466-S10312972172011032200000) . NEXT: Go to next step
  8. PERFORM SENSITIVITY CHECK Using the Techstream, perform the sensitivity check. Refer to «INITIALIZATION»(ref-389466-S10312972172011032200000) . Standard range 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END
  9. CHECK CONNECTOR Disconnect the connectors from the occupant classification ECU and front seat inner belt RH. Check that the connectors (on the occupant classification ECU side and front seat inner belt RH side) are not damaged. OK Connectors are not deformed or damaged. NG --> REPLACE NO. 2 FLOOR WIRE OK: Go to next step
  10. REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Turn the ignition switch OFF. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds. Replace the front seat inner belt RH. Refer to «REMOVAL»(ref-389467-S26310028982011032200000) . Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds. NEXT: Go to next step
  11. PERFORM ZERO POINT CALIBRATION Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds. Connect the Techstream to the DLC3. Turn the ignition switch ON, and wait for at least 60 seconds. Using the Techstream, perform the zero point calibration. Refer to «INITIALIZATION»(ref-389466-S10312972172011032200000) . NEXT: Go to next step
  12. PERFORM SENSITIVITY CHECK Using the Techstream, perform the sensitivity check. Refer to «INITIALIZATION»(ref-389466-S10312972172011032200000) . Standard range 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END
  13. CHECK INTEGRATION CONTROL AND PANEL ASSEMBLY (PASSENGER AIRBAG ON/OFF INDICATOR) Turn the ignition switch ON, and wait for at least 60 seconds. The passenger airbag ON/OFF indicator (ON and OFF) comes on for approximately 4 seconds, then turns off for approximately 2 seconds. Approximately 6 seconds after the ignition switch is turned ON, check that the passenger airbag ON/OFF indicator indicates ON/OFF according to the condition listed below. RESULT Front Seat Passenger Passenger Airbag Cut-off Switch Position ON Indicator OFF Indicator SRS Warning Light Adult seated ON ON OFF OFF Adult seated OFF OFF ON OFF Child seated / Child restraint system set AUTO OFF ON OFF Child seated / Child restraint system set OFF OFF ON OFF Vacant ON OFF OFF OFF Vacant OFF OFF ON OFF OK Passenger airbag ON/OFF indicator illuminates as specified in table above. OK --> See step 17 NG: Go to next step
  14. RETIGHTEN FRONT SEAT ASSEMBLY RH BOLT Turn the ignition switch OFF. Loosen the 4 installation bolts of the front seat RH. Tighten the 4 installation bolts of the front seat RH to the specified torque. for Manual Seat. Refer to «INSTALLATION»(ref-389422-S14732836102011032200000) for Power Seat. Refer to «INSTALLATION»(ref-389422-S30122868692011032200000) Torque: 37 N*m (377 kgf*cm, 27 ft.*lbf) NEXT: Go to next step
  15. PERFORM ZERO POINT CALIBRATION Connect the Techstream to the DLC3. Turn the ignition switch ON, and wait for at least 60 seconds. Using the Techstream, perform the zero point calibration. Refer to «INITIALIZATION»(ref-389466-S10312972172011032200000) . OK Zero point calibration is completed using tester. NG --> Go to next step OK --> END
  16. READ VALUE USING TECHSTREAM (PASSENGER SIDE BUCKLE SWITCH) Turn the ignition switch ON, and wait for at least 60 seconds. Using the Techstream, read the "Data List". Refer to «DATA LIST / ACTIVE TEST»(ref-389466-S03856397302011032200000) . OCCUPANT DETECTION: Tester Display Measure Item / Range Normal Condition Diagnostic Note Passenger Buckle SW Passenger side buckle switch / Set, Unset or NG Set: Passenger side seat belt is fastened Unset: Passenger side seat belt is unfastened NG: Passenger side seat belt is malfunctioning - OK Display changed correctly according to operation of buckle switch. NG --> See step 25 OK: Go to next step
  17. CHECK CONNECTOR Check that the connectors (on the center airbag sensor side and airbag cut-off switch side) are not damaged. OK Connectors are not deformed or damaged. NG --> REPLACE NO. 2 FLOOR WIRE OK: Go to next step
  18. INSPECT AIRBAG CUT-OFF SWITCH Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds. Disconnect the J33 switch connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Switch Condition Specified Condition 1 (PMC-) - 2 (PMC+) OFF 80 to 120 ohms ON 320 to 480 ohms NG --> See step 31 OK: Go to next step
  19. INSPECT INSTRUMENT PANEL WIRE Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds. Turn the ignition switch ON, and wait for at least 60 seconds. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Switch Condition Specified Condition J33-1 (PMC-) - Body ground Ignition switch ON Below 1 V J33-2 (PMC+) - Body ground Turn the ignition switch OFF. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds. Using a service wire, connect terminals 14 (MSW+) and 15 (MSW-) of connector B. NOTE: Do not forcibly insert the service wire into the terminals of the connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition J33-1 (PMC-) - J33-2 (PMC+) Always Below 1 ohms Disconnect the service wire from connector B. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition J33-1 (PMC-) - J33-2 (PMC+) Always 1 Mohms or higher J33-1 (PMC-) - Body ground J33-2 (PMC+) - Body ground NG --> REPLACE INSTRUMENT PANEL WIRE OK: Go to next step
  20. CHECK INTEGRATION CONTROL AND PANEL (PASSENGER AIRBAG ON/OFF INDICATOR) Connect the negative (-) terminal cable to the battery, and wait for 2 seconds. Turn the ignition switch ON, and wait for at least 60 seconds. The passenger airbag ON/OFF indicator (ON and OFF) comes on for approximately 4 seconds, then turns off for approximately 2 seconds. Approximately 6 seconds after the ignition switch is turned ON, check that the passenger airbag ON/OFF indicator indicates ON/OFF according to the condition listed below. RESULT Front Seat Passenger Passenger Airbag Cut-off Switch Position ON Indicator OFF Indicator SRS Warning Light Adult seated ON ON OFF OFF Adult seated OFF OFF ON OFF Child seated / Child restraint system set AUTO OFF ON OFF Child seated / Child restraint system set OFF OFF ON OFF Vacant ON OFF OFF OFF Vacant OFF OFF ON OFF OK Passenger airbag ON/OFF indicator illuminates as specified in table above. RESULT Result Proceed to NG A OK (for Column Shift Type) B OK (for Floor Shift Type) C C --> See step 33 B --> See step 32 A: Go to next step
  21. READ VALUE USING TECHSTREAM (SEAT BELT TENSION SENSOR) Fasten the passenger side seat belt. Turn the ignition switch ON, and wait for at least 60 seconds. Using the Techstream, read the "Data List". Refer to «DATA LIST / ACTIVE TEST»(ref-389466-S03856397302011032200000) . OCCUPANT DETECTION: Tester Display Test Part Control Range Diagnostic Note FL Sensor Voltage Front left sensor voltage/ Min.: 0 V Max.: 19.8 V 0 to 4.7 V - FR Sensor Voltage Front right sensor voltage/ Min.: 0 V Max.: 19.8 V 0 to 4.7 V - RL Sensor Voltage Rear left sensor voltage/ Min.: 0 V Max.: 19.8 V 0 to 4.7 V - RR Sensor Voltage Rear right sensor voltage/ Min.: 0 V Max.: 19.8 V 0 to 4.7 V - FL Sensor Weight Info Front left sensor weight information/ Min.: -17 kg (-37.48 lb) Max.: 27 kg (59.52 lb) -17 to 27 kg (-37.48 to 59.52 lb) - FR Sensor Weight Info Front right sensor weight information/ Min.: -17 kg (-37.48 lb) Max.: 27 kg (59.52 lb) -17 to 27 kg (-37.48 to 59.52 lb) - RL Sensor Weight Info Rear left sensor weight information/ Min.: -17 kg (-37.48 lb) Max.: 37 kg (81.57 lb) -17 to 37 kg (-37.48 to 81.57 lb) - RR Sensor Weight Info Rear right sensor weight information/ Min.: -17 kg (-37.48 lb) Max.: 37 kg (81.57 lb) -17 to 37 kg (-37.48 to 81.57 lb) - Total Weight Information Total weight information/ Min.: -68 kg (-149.91 lb) Max.: 128 kg (282.19 lb) -68 to 128 kg (-149.91 to 282.19 lb) - RESULT Result Proceed to Display is as specified in normal condition A Display is not as specified in normal condition (for Manual Seat) B Display is not as specified in normal condition (for Power Seat) C C --> See step 35 B --> See step 34 A: Go to next step
  22. REPLACE FRONT SEAT FRAME WITH ADJUSTER ASSEMBLY RH Turn the ignition switch OFF. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds. Replace the front seat from with adjuster RH. Refer to «REMOVAL»(ref-389422-S14958358232011032200000) . NEXT: Go to next step
  23. PERFORM ZERO POINT CALIBRATION Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds. Connect the Techstream to the DLC3. Turn the ignition switch ON, and wait for at least 60 seconds. Using the Techstream, perform the zero point calibration. Refer to «INITIALIZATION»(ref-389466-S10312972172011032200000) . NEXT: Go to next step
  24. PERFORM SENSITIVITY CHECK Using the Techstream, perform the sensitivity check. Refer to «INITIALIZATION»(ref-389466-S10312972172011032200000) . Standard range 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END
  25. CHECK CONNECTOR Disconnect the connectors from the occupant classification ECU and front seat inner belt RH. Check that the connectors (on the occupant classification ECU side and front seat inner belt RH side) are not damaged. OK Connectors are not deformed or damaged. NG --> REPLACE NO. 2 FLOOR WIRE OK: Go to next step
  26. REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Turn the ignition switch OFF. Replace front seat inner belt RH. Refer to «REMOVAL»(ref-389467-S26310028982011032200000) . NEXT: Go to next step
  27. PERFORM ZERO POINT CALIBRATION Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds. Connect the Techstream to the DLC3. Turn the ignition switch ON, and wait for at least 60 seconds. Using the Techstream, perform zero point calibration. Refer to «INITIALIZATION»(ref-389466-S10312972172011032200000) . NEXT: Go to next step
  28. PERFORM SENSITIVITY CHECK Using the Techstream, perform the sensitivity check. Refer to «INITIALIZATION»(ref-389466-S10312972172011032200000) . Standard range 27 to 33 kg (59.5 to 72.8 lb) NEXT --> END
  29. REPLACE OCCUPANT CLASSIFICATION ECU. Refer to «DISASSEMBLY»(ref-389422-S42057103112011032200000)
  30. REPLACE OCCUPANT CLASSIFICATION ECU. Refer to «DISASSEMBLY»(ref-389422-S26760409282011032200000)
  31. REPLACE AIRBAG CUT-OFF SWITCH. Refer to «REMOVAL»(ref-389421-S17264946912011032200000)
  32. REPLACE CENTER AIRBAG SENSOR. Refer to «REMOVAL»(ref-389421-S14433953552011032200000)
  33. REPLACE CENTER AIRBAG SENSOR. Refer to «REMOVAL»(ref-389421-S15426922272011032200000)
  34. REPLACE OCCUPANT DETECTION ECU. Refer to «DISASSEMBLY»(ref-389422-S42057103112011032200000)
  35. REPLACE OCCUPANT DETECTION ECU. Refer to «REMOVAL»(ref-389422-S08850645442011032200000)

More articles — Occupant Classification System (Diagnostic Codes)