DESCRIPTION
The front occupant classification sensor RH circuit consists of the occupant detection ECU and the front occupant classification sensor RH.
DTC B1781 is set when a malfunction is detected in the front occupant classification sensor RH circuit.
DTC No. |
DTC Detecting Conditions |
Trouble Areas |
---|---|---|
B1781 |
|
|
HINT:
WIRING DIAGRAM
CAUTION / NOTICE / HINT
HINT:
PROCEDURE
1. |
CHECK DTC |
(a) Turn the ignition switch to the ON position.
(b) Clear any DTCs stored in the memory (See page
).
HINT:
(c) Turn the ignition switch to the LOCK position.
(d) Turn the ignition switch to the ON position.
(e) Using the Techstream, check for DTCs of the occupant detection ECU (See page
).
OK:
DTC B1781 is not output.
HINT:
DTCs other than B1781 may be output at this time, but they are not related to this check.
OK | ![]() |
USE SIMULATION METHOD TO CHECK |
|
2. |
CHECK CONNECTION OF CONNECTORS |
(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) Check that the connectors are properly connected to the occupant detection ECU and the front occupant classification sensor RH.
OK:
The connectors are properly connected.
NG | ![]() |
OTHERS CONNECTORS |
|
3. |
CHECK CONNECTORS |
(a) Check that the connectors (on the occupant detection ECU side and front occupant
classification sensor RH side) are not damaged (See page
).
OK:
The connectors are not deformed or damaged.
NG | ![]() |
REPAIR OR REPLACE WIRE HARNESS |
|
4. |
CHECK NO. 1 SEAT WIRE (TO B+) |
(a) Disconnect the connectors from the occupant detection ECU and the front occupant classification sensor RH. |
|
(b) Connect the negative (-) terminal cable to the battery.
(c) Turn the ignition switch to the ON position.
(d) Measure the voltage.
Standard voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
O4-2 (SGD2) - Body ground |
Ignition switch ON |
Below 1 V |
O4-8 (SIG2) - Body ground |
Ignition switch ON |
Below 1 V |
O4-12 (SVC2) - Body ground |
Ignition switch ON |
Below 1 V |
NG | ![]() |
REPAIR OR REPLACE NO. 1 SEAT WIRE |
|
5. |
CHECK NO. 1 SEAT WIRE (FOR OPEN) |
(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) Using service wires, connect O7-1 (SVC2) and O7-3 (SGD2), and connect O7-2 (SIG2) and O7-3 (SGD2) of connector C.
NOTICE:
Do not forcibly insert the service wires into the terminals of the connector when connecting.
(d) Measure the resistance.
Standard resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
O4-8 (SIG2) - O4-2 (SGD2) |
Always |
Below 1 Ω |
O4-12 (SVC2) - O4-2 (SGD2) |
Always |
Below 1 Ω |
NG | ![]() |
REPAIR OR REPLACE NO. 1 SEAT WIRE |
|
6. |
CHECK NO. 1 SEAT WIRE (FOR SHORT) |
(a) Disconnect the service wires from connector C. |
|
(b) Measure the resistance.
Standard resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
O4-8 (SIG2) - O4-2 (SGD2) |
Always |
1 MΩ or higher |
O4-12 (SVC2) - O4-2 (SGD2) |
Always |
1 MΩ or higher |
O4-8 (SIG2) - O4-12 (SVC2) |
Always |
1 MΩ or higher |
NG | ![]() |
REPAIR OR REPLACE NO. 1 SEAT WIRE |
|
7. |
CHECK NO. 1 SEAT WIRE (TO GROUND) |
(a) Measure the resistance. Standard resistance:
|
|
NG | ![]() |
REPAIR OR REPLACE NO. 1 SEAT WIRE |
|
8. |
CHECK DTC |
(a) Connect the connectors to the occupant detection ECU and the front occupant classification sensor RH.
(b) Connect the negative (-) terminal cable to the battery.
(c) Turn the ignition switch to the ON position.
(d) Clear any DTCs stored in the memory (See page
).
HINT:
(e) Turn the ignition switch to the LOCK position.
(f) Turn the ignition switch to the ON position.
(g) Using the Techstream, check for DTCs of the occupant detection ECU (See page
).
OK:
DTC B1781 is not output.
HINT:
DTCs other than B1781 may be output at this time, but they are not related to this check.
OK | ![]() |
USE SIMULATION METHOD TO CHECK |
|
9. |
REPLACE OCCUPANT DETECTION 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 detection ECU (See page
).
HINT:
Perform the inspection using parts from a normal vehicle when possible.
|
10. |
PERFORM ZERO POINT CALIBRATION |
(a) Connect the negative (-) terminal cable to the battery.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Using the Techstream, perform the zero point calibration (See page
).
OK:
"Zero Point Calibration is complete." is displayed on the Techstream.
NG | ![]() |
GO TO STEP 13 |
|
11. |
PERFORM SENSITIVITY CHECK |
(a) Using the Techstream, perform the sensitivity check (See page
).
Standard value:
27 to 33 kg (59.52 to 72.75 lb)
NG | ![]() |
GO TO STEP 13 |
|
12. |
CHECK DTC |
(a) Connect the negative (-) terminal cable to the battery.
(b) Turn the ignition switch to the ON position.
(c) Clear any DTCs stored in the memory (See page
).
HINT:
(d) Turn the ignition switch to the LOCK position.
(e) Turn the ignition switch to the ON position.
(f) Using the Techstream, check for DTCs of the occupant detection ECU (See page
).
OK:
DTC B1781 is not output.
HINT:
DTCs other than B1781 may be output at this time, but they are not related to this check.
OK | ![]() |
USE SIMULATION METHOD TO CHECK |
|
13. |
REPLACE FRONT SEAT WITH ADJUSTER FRAME 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 with adjuster frame assembly RH (See page
).
|
14. |
PERFORM ZERO POINT CALIBRATION |
(a) Connect the negative (-) terminal cable to the battery.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Using the Techstream, perform the zero point calibration (See page
).
OK:
"Zero Point Calibration is complete." is displayed on the Techstream.
|
15. |
PERFORM SENSITIVITY CHECK |
(a) Using the Techstream, perform the sensitivity check (See page
).
Standard value:
27 to 33 kg (59.52 to 72.75 lb)
NEXT | ![]() |
USE SIMULATION METHOD TO CHECK |
Removal
REMOVAL
PROCEDURE
1. PRECAUTION
NOTICE:
After turning the ignition switch off, waiting time may be required before disconnecting
the cable from the negative (-) battery terminal. Therefore, make sure to read the
disconnecting the cable from the negative (-) battery terminal notices before pr ...
Cargo and luggage
Take notice of the following information about storage precautions, cargo
capacity and load.
● Stow cargo and luggage in the rear deck whenever possible.
● Be sure all items are secured in place.
● Be careful to keep the vehicle level. Placing the weight as far forward as
po ...
VSC OFF Switch Circuit
DESCRIPTION
The skid control ECU assembly is connected to the combination meter assembly
via CAN communication.
Pressing the VSC OFF switch turns off TRAC operation, and pressing and holding
this switch turns off TRAC and VSC operation.
If TRAC and VSC operations are turned off, the TRAC OFF ...