Toyota Avalon (XX50): 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

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Interior / Supplemental Restraint Systems / 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

Side Airbag Sensor Assembly No.2 Lost Communication (LH) (B163B,B163C)

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.

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 ECU 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 ECU assembly malfunction	Floor wire Side No. 1 airbag sensor LH Airbag ECU assembly	Comes on	Does not apply to test/check mode
B163C	Side Airbag Sensor Assembly No.2 Initialization Error (LH)	The airbag ECU 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 ECU assembly malfunction	Floor wire Side No. 1 airbag sensor LH Airbag ECU assembly	Comes on	Does not apply to test/check mode

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

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 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 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 LH)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
K33-2 (BFL+) - Body ground	Engine switch on (IG)	Below 1 V
K33-1 (BFL-) - 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 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
K33-2 (BFL+) - K33-1 (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
K33-2 (BFL+) - K33-1 (BFL-)	Always	1 MΩ or higher
K33-2 (BFL+) - Body ground	Always	1 MΩ or higher
K33-1 (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 ECU assembly.

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

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

Front Door Pressure Sensor RH Circuit Range/Performance (B166B,B166C,B166F)

DESCRIPTION

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

The side airbag pressure sensor RH and side No. 2 airbag sensor RH detect impacts to the vehicle and send 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 airbag pressure sensor RH.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Test Mode / Check Mode
B166B	Front Door Pressure Sensor RH Circuit Range/Performance	Side airbag pressure sensor RH malfunction Airbag ECU assembly malfunction	Side airbag pressure sensor RH Airbag ECU assembly	Comes on	Does not apply to test/check mode
B166C	Front Door Pressure Sensor RH	Side airbag pressure sensor RH malfunction Airbag ECU assembly malfunction	Side airbag pressure sensor RH Airbag ECU assembly	Comes on	Does not apply to test/check mode
B166F	Front Door Pressure Sensor Threshold Malfunction (RH)	Side airbag pressure sensor RH malfunction Airbag ECU assembly malfunction	Side airbag pressure sensor RH 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 AIRBAG PRESSURE SENSOR RH

(a) Turn the engine switch off.

*1	Side Airbag Pressure Sensor LH
*2	Side No. 2 Airbag Sensor RH

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

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminals 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 B166B, B166C, B166F, B167A, B167E and B167F may be output at this time, but they are not related to this check.

Result	Proceed to
DTC B166B, B166C or B166F is output.	A
DTC B167A, B167E or B167F is output.	B
DTCs B166B, B166C, B166F, B167A, B167E and B167F 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 airbag pressure sensor RH and LH to their original positions and connect the connectors.

REPLACE AIRBAG ECU ASSEMBLY

REPLACE SIDE AIRBAG PRESSURE SENSOR RH

USE SIMULATION METHOD TO CHECK

Lost Communication with Front Door Pressure Sensor RH (B166D,B166E)

DESCRIPTION

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

These DTCs are stored when a malfunction is detected in the side collision sensor RH circuit (bus 1).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Test Mode / Check Mode
B166D	Lost Communication with Front Door Pressure Sensor 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 1). Side airbag pressure sensor RH malfunction Airbag ECU assembly malfunction	Floor wire Front door wire RH Side airbag pressure sensor RH Airbag ECU assembly	Comes on	Does not apply to test/check mode
B166E	Front Door Pressure Sensor RH Initialization Incomplete	The airbag ECU assembly detects a line short, short to ground or B+, or an open in the side collision sensor RH circuit (bus 1). Side airbag pressure sensor RH malfunction Airbag ECU assembly malfunction	Floor wire Front door wire RH Side airbag pressure 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.

(c) Check that the connectors are properly connected to the side airbag pressure sensor RH and side No. 2 airbag sensor RH. Also check that the connectors that link the floor wire and front door wire RH are properly connected.

OK:

The connectors are properly connected.

CONNECT CONNECTORS PROPERLY

2.	CHECK CONNECTORS

(a) Disconnect the connectors from the side airbag pressure sensor RH and side No. 2 airbag sensor RH. Also disconnect the connectors that link the floor wire and front door wire 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 OR FRONT DOOR WIRE RH

3.	CHECK WIRE HARNESS

(a) Connect the connectors that link the floor wire and front door wire RH.

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

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

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
K30-1 (BDR+) - Body ground	Engine switch on (IG)	Below 1 V
K30-2 (BDR-) - Body ground	Engine switch on (IG)	Below 1 V

(e) Turn the engine switch off.

(f) 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.

(g) Using a service wire, connect terminals 2 (BDR+) and 1 (BDR-) of connector E.

NOTICE:

Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
K30-1 (BDR+) - K30-2 (BDR-)	Always	Below 1 Ω

(i) Disconnect the service wire from connector E.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
K30-1 (BDR+) - K30-2 (BDR-)	Always	1 MΩ or higher
K30-1 (BDR+) - Body ground	Always	1 MΩ or higher
K30-2 (BDR-) - Body ground	Always	1 MΩ or higher

GO TO STEP 5

4.	CHECK SIDE AIRBAG PRESSURE SENSOR RH

(a) Connect the connector to the side No. 2 airbag sensor RH.

*1	Side Airbag Pressure Sensor LH
*2	Side No. 2 Airbag Sensor RH

(b) Interchange the side airbag pressure 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 B166D, B166E, B167B and B167C may be output at this time, but they are not related to this check.

Result	Proceed to
DTC B166D or B166E is output.	A
DTC B167B or B167C is output.	B
DTCs B166D, B166E, B167B and B167C 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 airbag pressure sensor RH and LH to their original positions and connect the connectors.

REPLACE AIRBAG ECU ASSEMBLY

REPLACE SIDE AIRBAG PRESSURE SENSOR RH

USE SIMULATION METHOD TO CHECK

5.	CHECK FLOOR WIRE

(a) Disconnect the floor wire connector from the front door wire RH.

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

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

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
IK1-23 (BDR+) - Body ground	Engine switch on (IG)	Below 1 V
IK1-41 (BDR-) - Body ground	Engine switch on (IG)	Below 1 V

(e) Turn the engine switch off.

(f) 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.

(g) Using a service wire, connect terminals 1 (BDR+) and 2 (BDR-) of connector B.

NOTICE:

Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
IK1-23 (BDR+) - IK1-41 (BDR-)	Always	Below 1 Ω

(i) Disconnect the service wire from connector B.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
IK1-23 (BDR+) - IK1-41 (BDR-)	Always	1 MΩ or higher
IK1-23 (BDR+) - Body ground	Always	1 MΩ or higher
IK1-41 (BDR-) - Body ground	Always	1 MΩ or higher

REPLACE FRONT DOOR WIRE RH

REPLACE FLOOR WIRE

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)

Front Door Pressure Sensor LH (B167A,B167E,B167F). Lost Communication with Front Door Pressure Sensor LH (B167B,B167C). Airbag ECU Malfunction1 (B1160-B1167)

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