Occupant Classification System (Diagnostic Codes): Diagnosis Lexus LX J200

INSPECTION PROCEDURE

Note. w/ Navigation system: After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal. When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION .

HINT

1. If troubleshooting (wire harness inspection) is difficult to perform, remove the front passenger seat installation bolts to see the undersurface of the seat cushion.
2. In the above case, hold the seat so that it does not fall down.

Scheme 382

1. CHECK FOR DTC Turn the engine switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . Clear the DTCs stored in the center airbag sensor. Refer to «DTC CHECK / CLEAR»(ref-385233-S26916866102011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . OK DTC B1771 is not output. HINT: Codes other than B1771 may be output at this time, but they are not related to this check. NG --> See step 2 OK --> See step 10
2. CHECK CONNECTION OF CONNECTOR Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Check that the connectors are properly connected to the occupant classification ECU and the front seat inner belt RH. OK Connectors are properly connected. NG --> CONNECT CONNECTORS PROPERLY OK: Go to next step
3. CHECK CONNECTOR Disconnect the connectors from the occupant classification ECU and front seat inner belt RH. Check that the connectors (on the center airbag sensor side and front seat inner belt RH side) are not damaged. OK Connectors are not deformed or damaged. HINT: If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection. NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
4. CHECK FRONT SEAT WIRE RH (FRONT SEAT INNER BELT RH - OCCUPANT CLASSIFICATION ECU) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified condition c8-13 (BSW) - Body ground Engine switch on (IG) Below 1 V c8-14 (BGND) - Body ground Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Using a service wire, connect terminals 1 (RBE+) and 2 (RBE-) of connector C. NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified condition c8-13 (BSW) - c8-14 (BGND) Always Below 1 ohms Disconnect the service wire from connector C. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified condition c8-13 (BSW) - Body ground Always 1 Mohms or higher c8-14 (BGND) - Body ground c8-13 (BSW) - c8-14 (BGND) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
5. CHECK FOR DTC Connect the connectors to the occupant classification ECU and the front seat inner belt RH. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds. Turn the engine switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . Clear the DTCs stored in the center airbag sensor. Refer to «DTC CHECK / CLEAR»(ref-385233-S26916866102011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . OK DTC B1771 is not output. HINT: Codes other than DTC B1771 may be output at this time, but they are not related to this check. NG --> See step 6 OK --> See step 10
6. REPLACE FRONT SEAT INNER BELT ASSEMBLY RH (PASSENGER SIDE BUCKLE SWITCH) Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Replace the front seat inner belt RH. Refer to «REMOVAL»(ref-385314-S28374368152011021400000) . HINT: Perform the inspection using parts from a normal vehicle if possible. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds. Turn the engine switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . Clear the DTCs stored in the center airbag sensor. Refer to «DTC CHECK / CLEAR»(ref-385233-S26916866102011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . OK DTC B1771 is not output. HINT: Codes other than DTC B1771 may be output at this time, but they are not related to this check. NG --> See step 7 OK --> END
7. REPLACE NO. 1 SEAT CUSHION ASSEMBLY (OCCUPANT CLASSIFICATION ECU) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Using the Techstream, save the ECU data from the ECU which is installed in the vehicle. Refer to «REGISTRATION»(ref-385313-S25701287342011021400000) . Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Replace the No. 1 seat cushion (occupant classification ECU). Refer to «DISASSEMBLY»(ref-385219-S07493195202011021400000) . Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds. Turn the engine switch on (IG). Using the Techstream, load the previous ECU data stored in the Techstream into the new ECU. Refer to «REGISTRATION»(ref-385313-S25701287342011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Clear the DTCs stored in the memory. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . HINT: If DTCs are not cleared at this time, past DTCs will remain. NEXT: Go to next step
8. PERFORM ZERO POINT CALIBRATION Connect the Techstream to the DLC3. Turn the engine switch on (IG). Using the Techstream, perform zero point calibration. Refer to «INITIALIZATION»(ref-385313-S14540855742011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . HINT: If the DTCs are not cleared at this time, past DTCs will remain. NEXT: Go to next step
9. PERFORM SENSITIVITY CHECK Perform the sensitivity check. Refer to «INITIALIZATION»(ref-385313-S14540855742011021400000) . NEXT --> END
10. USE SIMULATION METHOD TO CHECK. Refer to «DIAGNOSIS SYSTEM»(ref-385313-S06292088792011021400000)

Note. w/ Navigation system: After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal. When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION .

HINT

1. If troubleshooting (wire harness inspection) is difficult to perform, remove the passenger seat installation bolts to see the undersurface of the seat cushion.
2. In the above case, hold the seat so that it does not fall down.

Scheme 383

1. CHECK FOR DTC Turn the engine switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . Clear the DTCs stored in the center airbag sensor. Refer to «DTC CHECK / CLEAR»(ref-385233-S26916866102011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . OK DTC B1772 is not output. HINT: DTCs other than B1772 may be output at this time, but they are not related to this check. NG --> See step 3 OK --> See step 2
2. USE SIMULATION METHOD TO CHECK. Refer to «DIAGNOSIS SYSTEM»(ref-385313-S06292088792011021400000)
3. CHECK CONNECTION OF CONNECTOR Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Check that the connectors are properly connected to the occupant classification ECU and the seat belt tension sensor. OK Connectors are properly connected. NG --> CONNECT CONNECTORS PROPERLY OK: Go to next step
4. CHECK CONNECTOR Disconnect the connectors from the occupant classification ECU and the belt tension sensor. Check that the connectors (on the center airbag sensor side and seat belt tension sensor side) are not damaged. OK Connectors are not deformed or damaged. NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
5. CHECK FRONT SEAT WIRE RH (SEAT POSITION SENSOR - OCCUPANT CLASSIFICATION ECU) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition c8-4 (SP) - Body ground Engine switch on (IG) Below 1 V c8-3 (GSP) - Body ground Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Using a service wire, connect terminals 4 (GSP) and 3 (SP) of connector C. NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition c8-4 (SP) - c8-3 (GSP) Always Below 1 ohms Disconnect the service wire from connector C. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition c8-4 (SP) - Body ground Always 1 Mohms or higher c8-3 (GSP) - Body ground c8-4 (SP) - c8-3 (GSP) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
6. CHECK FOR DTC Connect the connectors to the occupant classification ECU and the seat position sensor. Connect the cable to the negative (-) battery terminal. Turn the engine switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . Clear the DTCs stored in the center airbag sensor. Refer to «DTC CHECK / CLEAR»(ref-385233-S26916866102011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . OK DTC B1772 is not output. HINT: DTCs other than B1772 may be output at this time, but they are not related to this check. NG --> See step 7 OK --> See step 2
7. REPLACE SEAT POSITION SENSOR Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Replace the seat position sensor. Refer to «REMOVAL»(ref-385228-S41109868582011021400000) . HINT: Perform the inspection using parts from a normal vehicle if possible. The seat position sensor is installed on the driver side. Connect the cable to the negative (-) battery terminal. Turn the engine switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . Clear the DTCs stored in the center airbag sensor. Refer to «DTC CHECK / CLEAR»(ref-385233-S26916866102011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . OK DTC B1772 is not output. HINT: DTCs other than B1772 may be output at this time, but they are not related to this check. NG --> See step 8 OK --> END
8. REPLACE NO. 1 SEAT CUSHION ASSEMBLY (OCCUPANT CLASSIFICATION ECU) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Using the Techstream, save the ECU data from the ECU which is installed in the vehicle. Refer to «REGISTRATION»(ref-385313-S25701287342011021400000) . Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Replace the No. 1 seat cushion (occupant classification ECU). Refer to «DISASSEMBLY»(ref-385219-S07493195202011021400000) . Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds. Turn the engine switch on (IG). Using the Techstream, load the previous ECU data stored in the Techstream into the new ECU. Refer to «REGISTRATION»(ref-385313-S25701287342011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Clear the DTCs stored in the memory. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . HINT: If DTCs are not cleared at this time, past DTCs will remain. NEXT: Go to next step
9. PERFORM ZERO POINT CALIBRATION Connect the Techstream to the DLC3. Turn the engine switch on (IG). Using the Techstream, perform zero point calibration. Refer to «INITIALIZATION»(ref-385313-S14540855742011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . HINT: If the DTCs are not cleared at this time, past DTCs will remain. NEXT: Go to next step
10. PERFORM SENSITIVITY CHECK Perform the sensitivity check. Refer to «INITIALIZATION»(ref-385313-S14540855742011021400000) . NEXT --> END

Note. w/ Navigation system: After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal. When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION .

HINT

1. If troubleshooting (wire harness inspection) is difficult to perform, remove the passenger seat installation bolts to see the undersurface of the seat cushion.
2. In the above case, hold the seat so that it does not fall down.

Scheme 384

Scheme 385

1. CHECK FOR DTC Turn the engine switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . Clear the DTCs stored in the center airbag sensor. Refer to «DTC CHECK / CLEAR»(ref-385233-S26916866102011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . OK DTC B1773 and B1776 are not output. HINT: Codes other than DTC B1773 and B1776 may be output at this time, but they are not related to this check. NG --> See step 2 OK --> See step 10
2. CHECK CONNECTION OF CONNECTOR Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Check that the connectors are properly connected to the occupant classification ECU and the seat belt tension sensor. OK Connectors are properly connected. NG --> CONNECT CONNECTORS PROPERLY OK: Go to next step
3. CHECK CONNECTOR Disconnect the connectors from the occupant classification ECU and the belt tension sensor. Check that the connectors (on the center airbag sensor side and seat belt tension sensor side) are not damaged. OK Connectors are not deformed or damaged. HINT: If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection. NG --> REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK SEAT BELT TENSION SENSOR CIRCUIT Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition c8-8 (GBT) - Body ground Engine switch on (IG) Below 1 V c8-16 (BT) - Body ground c8-17 (VBT) - Body ground Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Using 2 service wires, connect terminals 1 (GBT) and 3 (BT), and connect terminals 1 (GBT) and 2 (VBT) of connector E. NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition c8-16 (BT) - c8-8 (GBT) Always Below 1 ohms c8-17 (VBT) - c8-8 (GBT) Disconnect the service wires from connector E. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition c8-8 (GBT) - Body ground Always 1 Mohms or higher c8-16 (BT) - Body ground c8-17 (VBT) - Body ground c8-16 (BT) - c8-8 (GBT) c8-17 (VBT) - c8-8 (GBT) NG --> See step 11 OK: Go to next step
5. CHECK FOR DTC Connect the connectors to the occupant classification ECU and the seat belt tension sensor. Connect the cable to the negative (-) battery terminal. Turn the engine switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . Clear the DTCs stored in the center airbag sensor. Refer to «DTC CHECK / CLEAR»(ref-385233-S26916866102011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . OK DTC B1773 and B1776 are not output. HINT: Codes other than DTC B1773 and B1776 may be output at this time, but they are not related to this check. NG --> See step 6 OK --> See step 10
6. REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH (SEAT BELT TENSION SENSOR) Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Replace the front seat outer belt. Refer to «REMOVAL»(ref-385314-S20923964312011021400000) . HINT: Perform the inspection using parts from a normal vehicle if possible. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds. Turn the engine switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . Clear the DTCs stored in the center airbag sensor. Refer to «DTC CHECK / CLEAR»(ref-385233-S26916866102011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . OK DTC B1773 and B1776 are not output. HINT: Codes other than DTC B1773 and B1776 may be output at this time, but they are not related to this check. NG --> See step 7 OK --> END
7. REPLACE NO. 1 SEAT CUSHION ASSEMBLY (OCCUPANT CLASSIFICATION ECU) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Using the Techstream, save the ECU data from the ECU which is installed in the vehicle. Refer to «REGISTRATION»(ref-385313-S25701287342011021400000) . Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Replace the No. 1 seat cushion (occupant classification ECU). Refer to «DISASSEMBLY»(ref-385219-S07493195202011021400000) . Connect the cable to the negative (-) battery terminal. Turn the engine switch on (IG). Using the Techstream, load the previous ECU data stored in the Techstream into the new ECU. Refer to «REGISTRATION»(ref-385313-S25701287342011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Clear the DTCs stored in the memory. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . HINT: If DTCs are not cleared at this time, past DTCs will remain. NEXT: Go to next step
8. PERFORM ZERO POINT CALIBRATION Connect the Techstream to the DLC3. Turn the engine switch on (IG). Using the Techstream, perform zero point calibration. Refer to «INITIALIZATION»(ref-385313-S14540855742011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . HINT: If the DTCs are not cleared at this time, past DTCs will remain. NEXT: Go to next step
9. PERFORM SENSITIVITY CHECK Perform the sensitivity check. Refer to «INITIALIZATION»(ref-385313-S14540855742011021400000) . NEXT --> END
10. USE SIMULATION METHOD TO CHECK. Refer to «DIAGNOSIS SYSTEM»(ref-385313-S06292088792011021400000)
11. CHECK FRONT SEAT WIRE RH (OCCUPANT CLASSIFICATION ECU - NO. 2 FLOOR WIRE) Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Disconnect the front seat wire RH connector from the No. 2 floor wire. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition Lc2-2 (VBT) - Body ground Engine switch on (IG) Below 1 V Lc2-3 (BT) - Body ground Lc2-4 (GBT) - Body ground Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 2 seconds. Disconnect the front seat wire RH connector from the No. 2 floor wire. Using 2 service wires, connect terminals 8 (GBT) and 16 (BT), and connect terminals 17 (VBT) of connector B. NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Lc2-4 (GBT) - Lc2-3 (BT) Always Below 1 ohms Lc2-4 (GBT) - Lc2-2 (VBT) Disconnect the service wires from connector B. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Lc2-4 (GBT) - Lc2-3 (BT) Always 1 Mohms or higher Lc2-4 (GBT) - Lc2-2 (VBT) Lc2-2 (VBT) - Body ground Lc2-3 (BT) - Body ground Lc2-4 (GBT) - Body ground NG --> REPLACE FRONT SEAT WIRE RH OK --> REPLACE NO. 2 FLOOR WIRE

Note. w/ Navigation system: After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal. When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION .

HINT

1. If troubleshooting (wire harness inspection) is difficult to perform, remove the passenger seat installation bolts to see the undersurface of the seat cushion.
2. In the above case, hold the seat so that it does not fall down.
3. After performing the zero point calibration, check for DTCs to confirm that the calibration is completed normally (if it fails, DTC B1797 will be output).

Scheme 386

1. CHECK FOR DTC Turn the engine switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . Clear the DTCs stored in the center airbag sensor. Refer to «DTC CHECK / CLEAR»(ref-385233-S26916866102011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . OK DTC B1774 and B1775 are not output. HINT: Codes other than DTC B1774 and B1775 may be output at this time, but they are not related to this check. NG --> See step 2 OK --> See step 10
2. CHECK CONNECTION OF CONNECTOR Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Check that the connectors are properly connected to the occupant classification ECU and the occupant detection sensor. OK Connectors are properly connected. NG --> CONNECT CONNECTORS PROPERLY OK: Go to next step
3. CHECK CONNECTOR Disconnect the connectors from the occupant classification ECU and the occupant detection sensor. Check that the connectors (on the center airbag sensor and occupant detection sensor side) are not damaged. OK Connectors are not deformed or damaged. NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
4. CHECK FRONT SEAT WIRE RH (OCCUPANT DETECTION SENSOR - OCCUPANT CLASSIFICATION ECU) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition c8-6 (PS) - Body ground Engine switch on (IG) Below 1 V c8-7 (VPS) - Body ground c8-15 (GPS) - Body ground Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Using 2 service wires, connect terminals 1 (GPS) and 3 (VPS), and connect terminals 2 (PS) and 3 (VPS) of connector C. NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition c8-6 (PS) - c8-7 (VPS) Always Below 1 ohms c8-7 (VPS) - c8-15 (GPS) Disconnect the service wires from connector C. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition c8-6 (PS) - Body ground Always 1 Mohms or higher c8-7 (VPS) - Body ground c8-15 (GPS) - Body ground c8-6 (PS) - c8-15 (GPS) c8-7 (VPS) - c8-15 (GPS) NG --> REPLACE FRONT SEAT WIRE RH OK: Go to next step
5. CHECK FOR DTC Connect the connectors to the occupant classification ECU and the occupant detection sensor. Connect the cable to the negative (-) battery terminal. Turn the engine switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . Clear the DTCs stored in the center airbag sensor. Refer to «DTC CHECK / CLEAR»(ref-385233-S26916866102011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . OK DTC B1774 and B1775 are not output. HINT: Codes other than DTC B1774 and B1775 may be output at this time, but they are not related to this check. NG --> See step 6 OK --> See step 10
6. REPLACE NO. 1 SEAT CUSHION ASSEMBLY (OCCUPANT CLASSIFICATION ECU AND OCCUPANT DETECTION SENSOR) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Using the Techstream, save the ECU data from the ECU which is installed in the vehicle. Refer to «REGISTRATION»(ref-385313-S25701287342011021400000) . Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Replace the No. 1 seat cushion (occupant classification ECU and occupant detection sensor). Refer to «DISASSEMBLY»(ref-385219-S07493195202011021400000) . Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds. Turn the engine switch on (IG). Using the Techstream, load the previous ECU data stored in the Techstream into the new ECU. Refer to «REGISTRATION»(ref-385313-S25701287342011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Clear the DTCs stored in the memory. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . HINT: If the DTCs are not cleared at this time, past DTCs will remain. NEXT: Go to next step
7. PERFORM ZERO POINT CALIBRATION Connect the Techstream to the DLC3. Turn the engine switch on (IG). Using the Techstream, perform zero point calibration. Refer to «INITIALIZATION»(ref-385313-S14540855742011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Clear the DTCs stored in the memory. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . HINT: If DTCs are not cleared at this time, past DTCs will remain. NEXT: Go to next step
8. CHECK FOR DTC HINT: Check that the zero point calibration is completed normally. If one of the following conditions is met, DTC B1797 will be output (refer to Initialization. Refer to «INITIALIZATION»(ref-385313-S14540855742011021400000) ): Zero point calibration is performed when the conditions for the calibration are not satisfied. Zero point calibration has failed. Turn the engine switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . Clear the DTCs stored in the center airbag sensor. Refer to «DTC CHECK / CLEAR»(ref-385233-S26916866102011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . OK DTC B1797 is not output. HINT: Codes other than DTC B1797 may be output at this time, but they are not related to this check. NG --> See step 11 OK: Go to next step
9. PERFORM SENSITIVITY CHECK Perform the sensitivity check. Refer to «INITIALIZATION»(ref-385313-S14540855742011021400000) . NEXT --> END
10. USE SIMULATION METHOD TO CHECK. Refer to «DIAGNOSIS SYSTEM»(ref-385313-S06292088792011021400000)
11. Go to DTC B1797. Refer to «DTC B1797: Calibration Malfunction»(ref-385315-S14954967042011021400000)

Note. w/ Navigation system: After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal. When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION .

HINT

1. If troubleshooting (wire harness inspection) is difficult to perform, remove the front passenger seat installation bolts to see the undersurface of the seat cushion.
2. In the above case, hold the seat so that it does not fall down.

Scheme 387

Scheme 388

1. CHECK FOR DTC Turn the engine switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . Clear the DTCs stored in the center airbag sensor. Refer to «DTC CHECK / CLEAR»(ref-385233-S26916866102011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . OK DTC B1790 is not output. HINT: Codes other than DTC B1790 may be output at this time, but they are not related to this check. NG --> See step 2 OK --> See step 14
2. CHECK CONNECTION OF CONNECTOR Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Check that the connectors are properly connected to the occupant classification ECU and the center airbag sensor. OK Connectors are properly connected. NG --> CONNECT CONNECTORS PROPERLY OK: Go to next step
3. CHECK CONNECTOR Disconnect the connectors from the center airbag sensor and the occupant classification ECU. Check that the connectors (on the center airbag sensor side and occupant classification ECU side) are not damaged. OK Connectors are not deformed or damaged. NG --> REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition c8-11 (FSR+) - Body ground Engine switch on (IG) Below 1 V c8-12 (FSR-) - Body ground Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Using a service wire, connect terminals 16 (FSR+) and 22 (FSR-) of connector B. NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition c8-11 (FSR+) - c8-12 (FSR-) 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 c8-11 (FSR+) - c8-12 (FSR-) Always 1 Mohms or higher c8-11 (FSR+) - Body ground c8-12 (FSR-) - Body ground NG --> See step 12 OK: Go to next step
5. CHECK FOR DTC Connect the connectors to the occupant classification ECU and the center airbag sensor. Connect the Techstream to the DLC3. Connect the cable to the negative (-) battery terminal. Turn the engine switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . Clear the DTCs stored in the center airbag sensor. Refer to «DTC CHECK / CLEAR»(ref-385233-S26916866102011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Using the Techstream, check for DTCs of the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . OK DTC B1790 is not output. HINT: Codes other than DTC B1790 may be output at this time, but they are not related to this check. NG --> See step 6 OK --> See step 13
6. REPLACE NO. 1 SEAT CUSHION ASSEMBLY (OCCUPANT CLASSIFICATION ECU) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Using the Techstream, save the ECU data from the ECU which is installed in the vehicle. Refer to «REGISTRATION»(ref-385313-S25701287342011021400000) . Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Replace the No. 1 seat cushion (occupant classification ECU). Refer to «DISASSEMBLY»(ref-385219-S07493195202011021400000) . Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds. Turn the engine switch on (IG). Using the Techstream, load the previous ECU data stored in the Techstream into the new ECU. Refer to «REGISTRATION»(ref-385313-S25701287342011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Clear the DTCs stored in the memory. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . HINT: If the DTCs are not cleared at this time, past DTCs will remain. NEXT: Go to next step
7. PERFORM ZERO POINT CALIBRATION Connect the Techstream to the DLC3. Turn the engine switch on (IG). Using the Techstream, perform zero point calibration. Refer to «INITIALIZATION»(ref-385313-S14540855742011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . HINT: If the DTCs are not cleared at this time, past DTCs will remain. NEXT: Go to next step
8. CHECK FOR DTC Turn the engine switch on (IG). Clear the DTCs stored in the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . Clear the DTCs stored in the center airbag sensor. Refer to «DTC CHECK / CLEAR»(ref-385233-S26916866102011021400000) . Turn the engine switch off. Turn the engine switch on (IG). Using the Techstream, check for DTCs of the occupant classification ECU. Refer to «DTC CHECK / CLEAR»(ref-385313-S18166417782011021400000) . OK DTC B1790 is not output. HINT: Codes other than DTC B1790 may be output at this time, but they are not related to this check. NG --> See step 10 OK: Go to next step
9. PERFORM SENSITIVITY CHECK Perform the sensitivity check. Refer to «INITIALIZATION»(ref-385313-S14540855742011021400000) . NEXT --> END
10. REPLACE CENTER AIRBAG SENSOR ASSEMBLY Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Replace the center airbag sensor. Refer to «REMOVAL»(ref-385228-S13064596932011021400000) . NEXT: Go to next step
11. PERFORM SENSITIVITY CHECK Perform the sensitivity check. Refer to «INITIALIZATION»(ref-385313-S14540855742011021400000) . NEXT --> END
12. CHECK NO. 2 FLOOR WIRE (CENTER AIRBAG SENSOR - FRONT SEAT WIRE RH) Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Disconnect the front seat wire RH connector from the No. 2 floor wire. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition Lc2-6 (FSR+) - Body ground Engine switch on (IG) Below 1 V Lc2-7 (FSR-) - Body ground Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. Disconnect the front seat wire RH connector from the No. 2 floor wire. Using service wire, connect terminals 16 (FSR+) and 22 (FSR-) of connector B. NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Lc2-6 (FSR+) - Lc2-7 (FSR-) 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 Lc2-6 (FSR+) - Lc2-7 (FSR-) Always 1 Mohms or higher Lc2-6 (FSR+) - Body ground Lc2-7 (FSR-) - Body ground NG --> REPLACE NO. 2 FLOOR WIRE OK --> REPLACE FRONT SEAT WIRE RH
13. USE SIMULATION METHOD TO CHECK. Refer to «DIAGNOSIS SYSTEM»(ref-385313-S06292088792011021400000)
14. USE SIMULATION METHOD TO CHECK. Refer to «DIAGNOSIS SYSTEM»(ref-385313-S06292088792011021400000)

Note. w/ Navigation system: After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal. When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION .

HINT

1. If troubleshooting (wire harness inspection) is difficult to perform, remove the front passenger seat installation bolts to see the undersurface of the seat cushion.
2. In the above case, hold the seat so that it does not fall down.

Note. w/ Navigation system: After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal. When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION .

Note. w/ Navigation system: After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal. When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION .

HINT

When the indicator is malfunctioning, if the SRS warning light is off, follow the procedures below as a DTC is not output. If the SRS warning light is on, a DTC is output. Troubleshoot for the output DTC.