DESCRIPTION The rear occupant classification sensor LH circuit consists of the occupant detection ECU and rear occupant classification sensor LH. DTC B1782 is stored when a malfunction is detected in the rear occupant classification sensor LH circuit.
WIRING DIAGRAM  CAUTION / NOTICE / HINT NOTICE: After turning the engine 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 proceeding with work. Click here
HINT:
PROCEDURE
(a) Turn the engine switch off. (b) Disconnect the cable from the negative (-) battery terminal. (c) Check that the connectors are properly connected to the occupant detection ECU and rear occupant classification sensor LH. OK: The connectors are properly connected. HINT: If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection. (d) Disconnect the connectors from the occupant detection ECU and rear occupant classification sensor LH. (e) Check that the terminals of the connectors are not deformed or damaged. OK: The terminals are not deformed or damaged.
(b) Turn the engine switch on (IG). (c) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(d) Turn the engine switch off. (e) Disconnect the cable from the negative (-) battery terminal. (f) Using service wires, connect terminals 1 (SVC3) and 3 (SGD3), and terminals 2 (SIG3) and 3 (SGD3) of connector C. NOTICE: Do not forcibly insert the service wire into the terminals of the connector when connecting the wire. (g) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(h) Disconnect the service wires from connector C. (i) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(a) Connect the connectors to the occupant detection ECU and rear occupant classification sensor LH. (b) Connect the cable to the negative (-) battery terminal. (c) Turn the engine switch on (IG), and wait for at least 60 seconds. (d) Clear the DTCs stored in the occupant detection ECU. Body Electrical > Occupant Detection > Clear DTCs(e) Clear the DTCs stored in the airbag ECU assembly. Body Electrical > SRS Airbag > Clear DTCs(f) Turn the engine switch off. (g) Turn the engine switch on (IG), and wait for at least 10 seconds. (h) Check for DTCs. Body Electrical > Occupant Detection > Trouble CodesOK: 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. (i) Turn the engine switch off.
(a) Disconnect the cable from the negative (-) battery terminal. (b) Replace the occupant detection ECU with a known good one. Click here
HINT: Perform the following inspection using known good parts from another vehicle if possible. (c) Connect the cable to the negative (-) battery terminal. (d) Turn the engine switch on (IG), and wait for at least 60 seconds. (e) Clear the DTCs stored in the occupant detection ECU. Body Electrical > Occupant Detection > Clear DTCs(f) Clear the DTCs stored in the airbag ECU assembly. Body Electrical > SRS Airbag > Clear DTCs(g) Turn the engine switch off. (h) Turn the engine switch on (IG), and wait for at least 10 seconds. (i) Check for DTCs. Body Electrical > Occupant Detection > Trouble CodesOK: 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. (j) Turn the engine switch off. (k) Disconnect the cable from the negative (-) battery terminal. (l) Restore the occupant detection ECU that was installed for testing to its original location. Click here
(a) Turn the engine switch off. (b) Disconnect the cable from the negative (-) battery terminal. (c) Replace the occupant detection ECU with a new one. Click here (d) Connect the cable to the negative (-) battery terminal.
(a) Using the Techstream, perform Zero Point Calibration. Click here
(a) Turn the engine switch off. (b) Disconnect the cable from the negative (-) battery terminal. (c) Replace the separate type front seat cushion spring assembly RH. Click here
(d) Connect the cable to the negative (-) battery terminal.
(a) Using the Techstream, perform Zero Point Calibration. Click here
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Can Communication System(for Gasoline Model): Dtc Combination Table
DTC COMBINATION TABLE HOW TO INTERPRET COMMUNICATION DTCS (DTCS THAT START WITH U) (a) If a CAN communication error cannot be reproduced, determine the suspected malfunctioning part using the DTCs stored in ECUs that are connected to the CAN buses by following the procedure below. HINT: Communicatio ...
