DESCRIPTION
The rear occupant classification sensor RH circuit consists of the occupant detection ECU and the rear occupant classification sensor RH.
DTC B1783 is set when a malfunction is detected in the rear occupant classification sensor RH circuit.
DTC No. |
DTC Detecting Conditions |
Trouble Areas |
---|---|---|
B1783 |
|
|
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 B1783 is not output.
HINT:
DTCs other than B1783 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 rear occupant classification sensor RH.
OK:
The connectors are properly connected.
NG | ![]() |
CONNECT CONNECTORS |
|
3. |
CHECK CONNECTORS |
(a) Check that the connectors (on the occupant detection ECU side and rear 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 rear 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 |
---|---|---|
O4-4 (SGD4) - Body ground |
Ignition switch ON |
Below 1 V |
O4-6 (SVC4) - Body ground |
Ignition switch ON |
Below 1 V |
O4-10 (SIG4) - 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 O9-1 (SVC4) and O9-3 (SGD4), and connect O9-2 (SIG4) and O9-3 (SGD4) 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 |
---|---|---|
O4-6 (SVC4) - O4-4 (SGD4) |
Always |
Below 1 Ω |
O4-10 (SIG4) - O4-4 (SGD4) |
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 |
---|---|---|
O4-6 (SVC4) - O4-4 (SGD4) |
Always |
1 MΩ or higher |
O4-10 (SIG4) - O4-4 (SGD4) |
Always |
1 MΩ or higher |
O4-6 (SVC4) - O4-10 (SIG4) |
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 voltage:
|
|
NG | ![]() |
REPAIR OR REPLACE NO. 1 SEAT WIRE |
|
8. |
CHECK DTC |
(a) Connect the connectors to the occupant detection ECU and the rear 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 B1783 is not output.
HINT:
DTCs other than B1783 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 B1783 is not output.
HINT:
DTCs other than B1783 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 |
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(b) Measure the voltage and resistance according to the value(s) in the table
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HINT:
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