Toyota Avalon (XX50): Front Door Pressure Sensor LH (B167A,B167E,B167F). Lost Communication with Front Door Pressure Sensor LH (B167B,B167C). Airbag ECU Malfunction1 (B1160-B1167)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Interior / Supplemental Restraint Systems / Airbag System(for Gasoline Model) / Front Door Pressure Sensor LH (B167A,B167E,B167F). Lost Communication with Front Door Pressure Sensor LH (B167B,B167C). Airbag ECU Malfunction1 (B1160-B1167)

Front Door Pressure Sensor LH (B167A,B167E,B167F)

DESCRIPTION

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

The side airbag pressure sensor LH and side No. 2 airbag sensor LH 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 LH.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Test Mode / Check Mode
B167A	Front Door Pressure Sensor LH	Side airbag pressure sensor LH malfunction Airbag ECU assembly malfunction	Side airbag pressure sensor LH Airbag ECU assembly	Comes on	Does not apply to test/check mode
B167E	Front Door Pressure Sensor Threshold Malfunction (LH)	Side airbag pressure sensor LH malfunction Airbag ECU assembly malfunction	Side airbag pressure sensor LH Airbag ECU assembly	Comes on	Does not apply to test/check mode
B167F	Front Door Pressure Sensor LH Circuit Range/Performance	Side airbag pressure sensor LH malfunction Airbag ECU assembly malfunction	Side airbag pressure sensor LH 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.

Click here

PROCEDURE

1.	CHECK SIDE AIRBAG PRESSURE SENSOR LH

(a) Turn the engine switch off.

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

(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 B167A, B167E or B167F is output.	A
DTC B166B, B166C or B166F 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 LH and RH to their original positions and connect the connectors.

REPLACE AIRBAG ECU ASSEMBLY

REPLACE SIDE AIRBAG PRESSURE SENSOR LH

USE SIMULATION METHOD TO CHECK

Lost Communication with Front Door Pressure Sensor LH (B167B,B167C)

DESCRIPTION

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

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Test Mode / Check Mode
B167B	Lost Communication with Front Door Pressure Sensor 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 1). Side airbag pressure sensor LH malfunction Airbag ECU assembly malfunction	Floor wire Front door wire LH Side airbag pressure sensor LH Airbag ECU assembly	Comes on	Does not apply to test/check mode
B167C	Front Door Pressure Sensor LH Initialization Incomplete	The airbag ECU assembly detects a line short, short to ground or B+, or an open in the side collision sensor LH circuit (bus 1). Side airbag pressure sensor LH malfunction Airbag ECU assembly malfunction	Floor wire Front door wire LH Side airbag pressure sensor LH 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 LH and side No. 2 airbag sensor LH. Also check that the connectors that link the floor wire and front door wire LH 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 LH and side No. 2 airbag sensor LH. Also disconnect the connectors that link the floor wire and front door wire 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 OR FRONT DOOR WIRE LH

3.	CHECK WIRE HARNESS

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

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

(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
K31-1 (BDL+) - Body ground	Engine switch on (IG)	Below 1 V
K31-2 (BDL-) - 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 (BDL+) and 1 (BDL-) 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
K31-1 (BDL+) - K31-2 (BDL-)	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
K31-1 (BDL+) - K31-2 (BDL-)	Always	1 MΩ or higher
K31-1 (BDL+) - Body ground	Always	1 MΩ or higher
K31-2 (BDL-) - Body ground	Always	1 MΩ or higher

GO TO STEP 5

4.	CHECK SIDE AIRBAG PRESSURE SENSOR LH

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

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

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

Result	Proceed to
DTC B167B or B167C is output.	A
DTC B166D or B166E 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 LH and RH to their original positions and connect the connectors.

REPLACE AIRBAG ECU ASSEMBLY

REPLACE SIDE AIRBAG PRESSURE SENSOR LH

USE SIMULATION METHOD TO CHECK

5.	CHECK FLOOR WIRE

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

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

(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
IK2-23 (BDL+) - Body ground	Engine switch on (IG)	Below 1 V
IK2-41 (BDL-) - 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 (BDL+) and 2 (BDL-) 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
IK2-23 (BDL+) - IK2-41 (BDL-)	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
IK2-23 (BDL+) - IK2-41 (BDL-)	Always	1 MΩ or higher
IK2-23 (BDL+) - Body ground	Always	1 MΩ or higher
IK2-41 (BDL-) - Body ground	Always	1 MΩ or higher

REPLACE FRONT DOOR WIRE LH

REPLACE FLOOR WIRE

Airbag ECU Malfunction1 (B1160-B1167)

DESCRIPTION

The airbag ECU assembly consists of the acceleration sensor, safing sensor, drive circuit, diagnosis circuit, ignition control, etc.

If the airbag ECU assembly receives signals from the acceleration sensor and pressure sensor, it determines whether the airbags and pretensioners should be deployed.

These DTCs are stored when a malfunction is detected in the airbag ECU assembly.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Test Mode / Check Mode
B1160	Airbag ECU Malfunction1	Airbag ECU assembly malfunction	Airbag ECU assembly	Comes on	Does not apply to test/check mode
B1161	Airbag ECU Malfunction2	Airbag ECU assembly malfunction	Airbag ECU assembly	Comes on	Does not apply to test/check mode
B1162	Airbag ECU Malfunction3	Airbag ECU assembly malfunction	Airbag ECU assembly	Comes on	Does not apply to test/check mode
B1163	Airbag ECU Malfunction4	Airbag ECU assembly malfunction	Airbag ECU assembly	Comes on	Does not apply to test/check mode
B1164	Airbag ECU Malfunction5	Airbag ECU assembly malfunction	Airbag ECU assembly	Comes on	Does not apply to test/check mode
B1165	Airbag ECU Malfunction6	Airbag ECU assembly malfunction	Airbag ECU assembly	Comes on	Does not apply to test/check mode
B1166	Airbag ECU Malfunction7	Airbag ECU assembly malfunction	Airbag ECU assembly	Comes on	Does not apply to test/check mode
B1167	Airbag ECU Malfunction8	Airbag ECU assembly malfunction	Airbag ECU assembly	Comes on	Does not apply to test/check mode

CAUTION / NOTICE / HINT

HINT:

If any DTCs other than B1160, B1161, B1162, B1163, B1164, B1165, B1166 and B1167 are also output, troubleshoot those DTCs first.

PROCEDURE

CHECK DTC

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

(b) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

NOTICE:

If only DTC B1160, B1161, B1162, B1163, B1164, B1165, B1166 or B1167 is output, do not clear the DTC, replace the airbag ECU assembly.

Result	Proceed to
Only DTC B1160, B1161, B1162, B1163, B1164, B1165, B1166 or B1167 is output	A
DTC B1160, B1161, B1162, B1163, B1164, B1165, B1166 or B1167 and other DTCs are output	B

REPLACE AIRBAG ECU ASSEMBLY

GO TO DIAGNOSTIC TROUBLE CODE CHART

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

Front Airbag Sensor (RH) (B1610). Front Airbag Sensor Lost Communication (RH) (B1612,B1613). Front Airbag Sensor (LH) (B1615)

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