SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1920-B1923; Short in Rear P/T Squib (RH) Circuit; 2018 - 2024 MY Camry HV [07/2017

Last Modified: 11-20-2023	6.11:8.1.0	Doc ID: RM1000000015C1S
Model Year Start: 2018	Model: Camry HV	Prod Date Range: [07/2017 - ]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1920-B1923; Short in Rear P/T Squib (RH) Circuit; 2018 - 2024 MY Camry HV [07/2017 - ]

DTC

B1920

Short in Rear P/T Squib (RH) Circuit

DTC

B1921

Open in Rear P/T Squib (RH) Circuit

DTC

B1922

Short in Rear P/T Squib (RH) Circuit (to Ground)

DTC

B1923

Short in Rear P/T Squib (RH) Circuit (to +B)

DESCRIPTION

The rear pretensioner squib RH circuit consists of the airbag sensor assembly and rear seat outer belt assembly RH.

The airbag sensor assembly uses this circuit to deploy the pretensioner when deployment conditions are met.

These DTCs are stored when a malfunction is detected in the rear pretensioner squib RH circuit.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Test Mode / Check Mode
B1920	Short in Rear P/T Squib (RH) Circuit	The airbag sensor assembly detects a line short in the rear pretensioner squib RH circuit during the primary check. Rear pretensioner squib RH malfunction Airbag sensor assembly malfunction	Floor wire Rear pretensioner squib RH (Rear seat outer belt assembly RH) Airbag sensor assembly	Comes on	Applies to check mode
B1921	Open in Rear P/T Squib (RH) Circuit	The airbag sensor assembly detects an open in the rear pretensioner squib RH circuit. Rear pretensioner squib RH malfunction Airbag sensor assembly malfunction	Floor wire Rear pretensioner squib RH (Rear seat outer belt assembly RH) Airbag sensor assembly	Comes on	Applies to check mode
B1922	Short in Rear P/T Squib (RH) Circuit (to Ground)	The airbag sensor assembly detects a short to ground in the rear pretensioner squib RH circuit. Rear pretensioner squib RH malfunction Airbag sensor assembly malfunction	Floor wire Rear pretensioner squib RH (Rear seat outer belt assembly RH) Airbag sensor assembly	Comes on	Applies to check mode
B1923	Short in Rear P/T Squib (RH) Circuit (to +B)	The airbag sensor assembly detects a short to B+ in the rear pretensioner squib RH circuit. Rear pretensioner squib RH malfunction Airbag sensor assembly malfunction	Floor wire Rear pretensioner squib RH (Rear seat outer belt assembly RH) Airbag sensor assembly	Comes on	Applies to check mode

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

Click here

HINT:

Perform the simulation method by selecting check mode (Signal Check) using the Techstream.
Click here
After selecting check mode (Signal Check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on a city road or rough road.
Click here

PROCEDURE

1.	CHECK CONNECTORS

(a) Turn the power switch off.

*1	Rear Seat Outer Belt Assembly RH
*2	Airbag Sensor Assembly
*3	Floor Wire

(b) Disconnect the cable from the negative (-) auxiliary battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

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 rear seat outer belt assembly RH and airbag sensor assembly.

(e) Check that the terminals of the connectors are not deformed or damaged.

OK:

The terminals are not deformed or damaged.

(f) Check that the floor wire connector (on the rear seat outer belt assembly RH side) is not loose, deformed or damaged.

OK:

The airbag connector locking button is not disengaged, and the claw of the lock is not deformed or damaged.

(g) Check that the short springs of the activation prevention mechanism of the floor wire connector are not deformed or damaged.

OK:

The short springs are not deformed or damaged.

REPLACE FLOOR WIRE

2.	CHECK REAR SEAT OUTER BELT ASSEMBLY RH

(a) Connect the connector to the airbag sensor assembly.

Rear Seat Outer Belt Assembly RH

Airbag Sensor Assembly

Front view of wire harness connector

(to Rear Seat Outer Belt Assembly RH)

(b) Connect SST (resistance 2.1 Ω) to connector C.

CAUTION:

Never connect a tester to the rear seat outer belt assembly RH for measurement, as this may lead to a serious injury due to pretensioner deployment.

NOTICE:

Do not forcibly insert SST into the terminals of the connector when connecting it.
Insert SST straight into the terminals of the connector.

SST: 09843-18061

(d) Turn the power switch on (IG), and wait for at least 60 seconds.

(e) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(f) Turn the power switch off.

(g) Turn the power switch on (IG), and wait for at least 60 seconds.

(h) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

OK:

DTC B1920, B1921, B1922 or B1923 is not output.

HINT:

Codes other than DTCs B1920, B1921, B1922 and B1923 may be output at this time, but they are not related to this check.

(i) Turn the power switch off.

(j) Disconnect the cable from the negative (-) auxiliary battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

(k) Disconnect SST from connector C.

REPLACE REAR SEAT OUTER BELT ASSEMBLY RH

3.	CHECK FLOOR WIRE

(a) Disconnect the floor wire from the airbag sensor assembly.

*1	Rear Seat Outer Belt Assembly RH
*2	Airbag Sensor Assembly
*3	Floor Wire
*a	Front view of wire harness connector (to Rear Seat Outer Belt Assembly RH)

(b) Check for a short to B+ in the circuit.

(1) Connect the cable to the negative (-) auxiliary battery terminal.

(2) Turn the power switch on (IG).

(3) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
R54-1 (RR+) - Body ground	Power switch on (IG)	Below 1 V
R54-2 (RR-) - Body ground	Power switch on (IG)	Below 1 V

(4) Turn the power switch off.

(5) Disconnect the cable from the negative (-) auxiliary battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R54-1 (RR+) - R54-2 (RR-)	Always	Below 1 Ω

(d) Check for a short to ground in the circuit.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R54-1 (RR+) - Body ground	Always	1 MΩ or higher
R54-2 (RR-) - Body ground	Always	1 MΩ or higher

(e) Check for a short in the circuit.

(1) Release the activation prevention mechanism built into connector B.

Click here

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R54-1 (RR+) - R54-2 (RR-)	Always	1 MΩ or higher

(3) Restore the released activation prevention mechanism of connector B to the original condition.

REPLACE FLOOR WIRE

CHECK DTC

(a) Connect the connectors to the rear seat outer belt assembly RH and airbag sensor assembly.

*1	Rear Seat Outer Belt Assembly RH
*2	Airbag Sensor Assembly

(b) Connect the cable to the negative (-) auxiliary battery terminal.

(d) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(e) Turn the power switch off.

(f) Turn the power switch on (IG), and wait for at least 60 seconds.

(g) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

OK:

DTC B1920, B1921, B1922 or B1923 is not output.

HINT:

Codes other than DTCs B1920, B1921, B1922 and B1923 may be output at this time, but they are not related to this check.

USE SIMULATION METHOD TO CHECK

REPLACE AIRBAG SENSOR ASSEMBLY