SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for TMMMS Made): B163B,B163C; Side Airbag Sensor Assembly No.2 Lost Communication (LH); 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022

Last Modified: 05-13-2024	6.11:8.1.0	Doc ID: RM1000000027799
Model Year Start: 2023	Model: GR Corolla	Prod Date Range: [09/2022 - 11/2022]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for TMMMS Made): B163B,B163C; Side Airbag Sensor Assembly No.2 Lost Communication (LH); 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]

DTC

B163B

Side Airbag Sensor Assembly No.2 Lost Communication (LH)

DTC

B163C

Side Airbag Sensor Assembly No.2 Initialization Error (LH)

DESCRIPTION

The side collision sensor LH circuit (bus 2) consists of the airbag sensor assembly and side No. 1 airbag sensor LH.

The side No. 1 airbag sensor LH detects impacts to the vehicle and sends signals to the airbag sensor assembly to determine if the airbags and pretensioners should be deployed.

These DTCs are stored when a malfunction is detected in the side collision sensor LH circuit (bus 2).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Test Mode / Check Mode
B163B	Side Airbag Sensor Assembly No.2 Lost Communication (LH)	The airbag sensor assembly detects a line short, short to ground or B+, or an open in the side collision sensor LH circuit (bus 2). Side No. 1 airbag sensor LH malfunction Airbag sensor assembly malfunction	Floor wire Side No. 1 airbag sensor LH Airbag sensor assembly	Comes on	Does not apply to test/check mode
B163C	Side Airbag Sensor Assembly No.2 Initialization Error (LH)	The airbag sensor assembly detects a line short, short to ground or B+, or an open in the side collision sensor LH circuit (bus 2). Side No. 1 airbag sensor LH malfunction Airbag sensor assembly malfunction	Floor wire Side No. 1 airbag sensor LH Airbag sensor assembly	Comes on	Does not apply to test/check mode

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
Click here

HINT:

When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

Click here

PROCEDURE

1.	CHECK CONNECTION OF CONNECTORS

(a) Turn the ignition switch off.

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

CAUTION:

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

OK:

The connectors are properly connected.

CONNECT CONNECTORS PROPERLY

2.	CHECK CONNECTORS

(a) Disconnect the connectors from the airbag sensor assembly and side No. 1 airbag sensor LH.

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

OK:

The terminals are not deformed or damaged.

REPLACE FLOOR WIRE

3.	CHECK FLOOR WIRE

(a) Connect the cable to the negative (-) battery terminal.

*1	Side No. 1 Airbag Sensor LH
*2	Airbag Sensor Assembly
*3	Floor Wire
*4	Service Wire
*a	Front view of wire harness connector (to Airbag Sensor Assembly)
*b	Front view of wire harness connector (to Side No. 1 Airbag Sensor LH)

(b) Turn the ignition switch to ON.

Standard Voltage:

Tester Connection	Condition	Specified Condition
O15-2 (BFL+) - Body ground	Ignition switch ON	Below 1 V
O15-1 (BFL-) - Body ground	Ignition switch ON	Below 1 V

(d) Turn the ignition switch off.

(e) Disconnect the cable from the negative (-) battery terminal.

CAUTION:

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

(f) Using a service wire, connect terminals 29 (BCL+) and 30 (BCL-) of connector B.

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:

Tester Connection	Condition	Specified Condition
O15-2 (BFL+) - O15-1 (BFL-)	Always	Below 1 Ω

(h) Disconnect the service wire from connector B.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
O15-2 (BFL+) - O15-1 (BFL-)	Always	1 MΩ or higher
O15-2 (BFL+) - Body ground	Always	1 MΩ or higher
O15-1 (BFL-) - Body ground	Always	1 MΩ or higher

REPLACE FLOOR WIRE

4.	CHECK SIDE NO. 1 AIRBAG SENSOR LH

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

*1	Side No. 1 Airbag Sensor RH
*2	Airbag Sensor Assembly

(b) Interchange the side No. 1 airbag sensor LH with RH and connect the connectors.

(d) Turn the ignition switch to ON, and wait for at least 60 seconds.

(e) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(f) Turn the ignition switch off.

(g) Turn the ignition switch to ON, and wait for at least 60 seconds.

(h) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTCs B162B, B162C, B163B and B163C may be output at this time, but they are not related to this check.

Result	Proceed to
DTC B163B or B163C is output.	A
DTC B162B or B162C is output.	B
DTCs B162B, B162C, B163B and B163C are not output.	C

(i) Turn the ignition switch off.

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

CAUTION:

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

(k) Return the side No. 1 airbag sensor LH and RH to their original positions and connect the connectors.

REPLACE AIRBAG SENSOR ASSEMBLY

REPLACE SIDE NO. 1 AIRBAG SENSOR LH

USE SIMULATION METHOD TO CHECK