DTC B1782: Rear Occupant Classification Sensor LH Circuit Malfunction: Procedure

1. Turn the ignition switch on (IG).
2. Clear the DTCs stored in the occupant classification ECU. Refer to DTC CHECK / CLEAR .
3. Clear the DTCs stored in the center airbag sensor assembly. Refer to DTC CHECK / CLEAR .
4. Turn the ignition switch off.
5. Turn the ignition switch on (IG).
6. Check the DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B1782 is not output.

   HINT: 

   Codes other than DTC B1782 may be output at this time, but they are not related to this check.

OK → USE SIMULATION METHOD TO CHECK 

NG: Go to next step 

1. Turn the ignition switch off.
2. Disconnect the negative (-) terminal cable from the battery.
3. Check that the connectors are properly connected to the occupant classification ECU and the rear occupant classification sensor LH.

   OK

   The connectors are connected.

NG → CONNECT CONNECTORS, THEN GO TO STEP   1 

OK: Go to next step 

1. Disconnect the connectors from the occupant classification ECU and the rear occupant classification sensor LH.
   Fig 1: Checking Front Seat Wire RH (Short To B+)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the negative (-) terminal cable to the battery.
3. Turn the ignition switch on (IG).
4. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester connection	Condition	Specified condition
   O2-3 (SGD3) - Body ground	Ignition switch on (IG)	Below 1 V
   O2-5 (SVC3) - Body ground	Ignition switch on (IG)	Below 1 V
   O2-9 (SIG3) - Body ground	Ignition switch on (IG)	Below 1 V

NG → REPAIR OR REPLACE FRONT SEAT WIRE RH 

OK: Go to next step 

1. Turn the ignition switch off.
   Fig 2: Checking Front Seat Wire RH (Open)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the negative (-) terminal cable from the battery.
3. Using a service wire, connect O6-1 (SVC3) and O6-3 (SGD3), and connect O6-2 (SIG3) and O6-3 (SGD3) of connector "C".
   NOTE:

   Do not forcibly insert a service wire into the terminals of the connector when connecting.

4. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester connection	Condition	Specified condition
   O2-5 (SVC3) - O2-3 (SGD3)	Always	Below 1 Ω
   O2-9 (SIG3) - O2-3 (SGD3)	Always	Below 1 Ω

NG → REPAIR OR REPLACE FRONT SEAT WIRE RH 

OK: Go to next step 

1. Disconnect the service wire from connector "C".
   Fig 3: Checking Front Seat Wire RH (Short)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester connection	Condition	Specified condition
   O2-5 (SVC3) - O2-3 (SGD3)	Always	1 MΩ or Higher
   O2-9 (SIG3) - O2-3 (SGD3)	Always	1 MΩ or Higher
   O2-5 (SVC3) - O2-9 (SIG3)	Always	1 MΩ or Higher

NG → REPAIR OR REPLACE FRONT SEAT WIRE RH 

OK: Go to next step 

1. Measure the resistance according to value(s) in the table below.
   Fig 4: Checking Front Seat Wire RH (Short To Ground)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester connection	Condition	Specified condition
   O2-3 (SGD3) - Body ground	Always	1 MΩ or Higher
   O2-5 (SVC3) - Body ground	Always	1 MΩ or Higher
   O2-9 (SIG3) - Body ground	Always	1 MΩ or Higher

NG → REPAIR OR REPLACE FRONT SEAT WIRE RH 

OK: Go to next step 

1. Connect the connectors to the occupant classification ECU and the rear occupant classification sensor LH.
2. Connect the negative (-) terminal cable to the battery.
3. Turn the ignition switch on (IG).
4. Clear the DTCs stored in the occupant classification ECU. Refer to DTC CHECK / CLEAR .
5. Clear the DTCs stored in the center airbag sensor assembly. Refer to DTC CHECK / CLEAR .
6. Turn the ignition switch off.
7. Turn the ignition switch on (IG).
8. Check the DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B1782 is not output.

   HINT: 

   Codes other than DTC B1782 may be output at this time, but they are not related to this check.

OK → USE SIMULATION METHOD TO CHECK 

NG: Go to next step 

1. Turn the ignition switch off.
2. Disconnect the negative (-) terminal cable from the battery.
3. Replace the occupant classification ECU. Refer to REMOVAL .

   HINT: 

   Perform the inspection using parts from a normal vehicle if possible.

NEXT: Go to next step 

1. Connect the negative (-) terminal cable to the battery.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch on (IG).
4. Using the Techstream, perform "Zero point calibration". Refer to INITIALIZATION .

   OK

   The "Zero Point Calibration is complete." is displayed.

NG → See step   12 

OK: Go to next step 

1. Using the Techstream, perform "Sensitivity check". Refer to INITIALIZATION .

   Standard value

   27 to 33 kg (59.52 to 72.75 lb)

NG → See step   12 

OK: Go to next step 

1. Turn the ignition switch on (IG).
2. Clear the DTCs stored in the occupant classification ECU. Refer to DTC CHECK / CLEAR .
3. Clear the DTCs stored in the center airbag sensor assembly. Refer to DTC CHECK / CLEAR .
4. Turn the ignition switch off.
5. Turn the ignition switch on (IG).
6. Check the DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B1782 is not output.

   HINT: 

   Codes other than DTC B1782 may be output at this time, but they are not related to this check.

OK → END 

NG: Go to next step 

1. Turn the ignition switch off.
2. Disconnect the negative (-) terminal cable from the battery.
3. Replace the front seat frame with adjuster assembly RH. Refer to REMOVAL for power seat or REMOVAL for manual seat.

NEXT: Go to next step 

1. Connect the negative (-) terminal cable to the battery.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch on (IG).
4. Using the Techstream, perform "Zero point calibration". Refer to INITIALIZATION .

   OK

   The "Zero Point Calibration is complete." is displayed.

NEXT: Go to next step 

1. Using the Techstream, perform "Sensitivity check". Refer to INITIALIZATION .

   Standard value

   27 to 33 kg (59.52 to 72.75 lb)

NEXT → END