Toyota Avalon (XX50): Side Airbag Sensor Assembly No.2 (RH) (B162A). Side Airbag Sensor Assembly No.2 Lost Communication (RH) (B162B,B162C). Side Airbag Sensor Assembly No.2 (LH) (B163A)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Interior / Supplemental Restraint Systems / Airbag System(for Gasoline Model) / Side Airbag Sensor Assembly No.2 (RH) (B162A). Side Airbag Sensor Assembly No.2 Lost Communication (RH) (B162B,B162C). Side Airbag Sensor Assembly No.2 (LH) (B163A)

Side Airbag Sensor Assembly No.2 (RH) (B162A)

DESCRIPTION

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

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

DTC B162A is stored when a malfunction is detected in the side No. 1 airbag sensor RH.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Test Mode / Check Mode
B162A	Side Airbag Sensor Assembly No.2 (RH)	Side No. 1 airbag sensor RH malfunction Airbag ECU assembly malfunction	Side No. 1 airbag sensor RH Airbag ECU assembly	Comes on	Does not apply to test/check mode

WIRING DIAGRAM

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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.

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PROCEDURE

1.	CHECK SIDE NO. 1 AIRBAG SENSOR RH

(a) Turn the engine switch off.

*1	Side No. 1 Airbag Sensor LH
*2	Airbag ECU Assembly

(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.

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

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

(f) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(g) Turn the engine switch off.

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

(i) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTCs B162A and B163A may be output at this time, but they are not related to this check.

Result	Proceed to
DTC B162A is output.	A
DTC B163A is output.	B
DTCs B162A and B163A are not output.	C

(j) Turn the engine switch off.

(k) 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.

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

REPLACE AIRBAG ECU ASSEMBLY

REPLACE SIDE NO. 1 AIRBAG SENSOR RH

USE SIMULATION METHOD TO CHECK

Side Airbag Sensor Assembly No.2 Lost Communication (RH) (B162B,B162C)

DESCRIPTION

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

The side No. 1 airbag sensor RH detects impacts to the vehicle and sends signals to the airbag ECU 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 RH circuit (bus 2).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Test Mode / Check Mode
B162B	Side Airbag Sensor Assembly No.2 Lost Communication (RH)	The airbag ECU assembly detects a line short, short to ground or B+, or an open in the side collision sensor RH circuit (bus 2). Side No. 1 airbag sensor RH malfunction Airbag ECU assembly malfunction	Floor wire Side No. 1 airbag sensor RH Airbag ECU assembly	Comes on	Does not apply to test/check mode
B162C	Side Airbag Sensor Assembly No.2 Initialization Error (RH)	The airbag ECU assembly detects a line short, short to ground or B+, or an open in the side collision sensor RH circuit (bus 2). Side No. 1 airbag sensor RH malfunction Airbag ECU assembly malfunction	Floor wire Side No. 1 airbag sensor RH Airbag ECU assembly	Comes on	Does not apply to test/check mode

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Click here

PROCEDURE

1.	CHECK CONNECTION OF CONNECTORS

(a) Turn the engine 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 ECU assembly and side No. 1 airbag sensor RH.

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

(b) Turn the engine switch on (IG).

Standard Voltage:

Tester Connection	Condition	Specified Condition
K32-2 (BFR+) - Body ground	Engine switch on (IG)	Below 1 V
K32-1 (BFR-) - Body ground	Engine switch on (IG)	Below 1 V

(d) Turn the engine 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 28 (BCR+) and 27 (BCR-) 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
K32-2 (BFR+) - K32-1 (BFR-)	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
K32-2 (BFR+) - K32-1 (BFR-)	Always	1 MΩ or higher
K32-2 (BFR+) - Body ground	Always	1 MΩ or higher
K32-1 (BFR-) - Body ground	Always	1 MΩ or higher

REPLACE FLOOR WIRE

4.	CHECK SIDE NO. 1 AIRBAG SENSOR RH

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

*1	Side No. 1 Airbag Sensor LH
*2	Airbag ECU Assembly

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

(d) Turn the engine 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 engine switch off.

(g) Turn the engine switch on (IG), 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 B162B or B162C is output.	A
DTC B163B or B163C is output.	B
DTCs B162B, B162C, B163B and B163C are not output.	C

(i) Turn the engine 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 RH and LH to their original positions and connect the connectors.

REPLACE AIRBAG ECU ASSEMBLY

REPLACE SIDE NO. 1 AIRBAG SENSOR RH

USE SIMULATION METHOD TO CHECK

Side Airbag Sensor Assembly No.2 (LH) (B163A)

DESCRIPTION

The side collision sensor LH circuit (bus 2) consists of the airbag ECU 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 ECU assembly to determine if the airbags and pretensioners should be deployed.

DTC B163A is stored when a malfunction is detected in the side No. 1 airbag sensor LH.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Test Mode / Check Mode
B163A	Side Airbag Sensor Assembly No.2 (LH)	Side No. 1 airbag sensor LH malfunction Airbag ECU assembly malfunction	Side No. 1 airbag sensor LH Airbag ECU assembly	Comes on	Does not apply to test/check mode

WIRING DIAGRAM

Click here

CAUTION / NOTICE / HINT

NOTICE:

Click here

PROCEDURE

1.	CHECK SIDE NO. 1 AIRBAG SENSOR LH

(a) Turn the engine switch off.

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

(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.

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

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

(f) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(g) Turn the engine switch off.

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

(i) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTCs B162A and B163A may be output at this time, but they are not related to this check.

Result	Proceed to
DTC B163A is output.	A
DTC B162A is output.	B
DTCs B162A and B163A are not output.	C

(j) Turn the engine switch off.

(k) 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.

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

REPLACE AIRBAG ECU ASSEMBLY

REPLACE SIDE NO. 1 AIRBAG SENSOR LH

USE SIMULATION METHOD TO CHECK

Airbag System(for Gasoline Model)

Side Airbag Sensor Assembly No.2 Lost Communication (LH) (B163B,B163C). Front Door Pressure Sensor RH Circuit Range/Performance (B166B,B166C,B166F). Lost Communication with Front Door Pressure Sensor

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