Toyota Avalon (XX50): Short in Knee Airbag (D Side) Squib Circuit (B1860-B1863). Short in Knee Airbag (P Side) Squib Circuit (B1865-B1868). Short in P/T Squib (RH) Circuit (B1900-B1903)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Interior / Supplemental Restraint Systems / Airbag System(for Gasoline Model) / Short in Knee Airbag (D Side) Squib Circuit (B1860-B1863). Short in Knee Airbag (P Side) Squib Circuit (B1865-B1868). Short in P/T Squib (RH) Circuit (B1900-B1903)

Short in Knee Airbag (D Side) Squib Circuit (B1860-B1863)

DESCRIPTION

The driver side knee airbag squib circuit consists of the airbag ECU assembly and lower No. 1 instrument panel airbag assembly.

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

These DTCs are stored when a malfunction is detected in the driver side knee airbag squib circuit.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Test Mode / Check Mode
B1860	Short in Knee Airbag (D Side) Squib Circuit	The airbag ECU assembly detects a line short in the driver side knee airbag squib during the primary check. Driver side knee airbag squib malfunction Airbag ECU assembly malfunction	Instrument panel wire Driver side knee airbag squib (Lower No. 1 instrument panel airbag assembly) Airbag ECU assembly	Comes on	Applies to check mode
B1861	Open in Knee Airbag (D Side) Squib Circuit	The airbag ECU assembly detects an open in the driver side knee airbag squib. Driver side knee airbag squib malfunction Airbag ECU assembly malfunction	Instrument panel wire Driver side knee airbag squib (Lower No. 1 instrument panel airbag assembly) Airbag ECU assembly	Comes on	Applies to check mode
B1862	Short in Knee Airbag (D Side) Squib Circuit (to Ground)	The airbag ECU assembly detects a short to ground in the driver side knee airbag squib. Driver side knee airbag squib malfunction Airbag ECU assembly malfunction	Instrument panel wire Driver side knee airbag squib (Lower No. 1 instrument panel airbag assembly) Airbag ECU assembly	Comes on	Applies to check mode
B1863	Short in Knee Airbag (D Side) Squib Circuit (to +B)	The airbag ECU assembly detects a short to B+ in the driver side knee airbag squib. Driver side knee airbag squib malfunction Airbag ECU assembly malfunction	Instrument panel wire Driver side knee airbag squib (Lower No. 1 instrument panel airbag assembly) Airbag ECU assembly	Comes on	Applies to 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

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 engine switch off.

*1	Lower No. 1 Instrument Panel Airbag Assembly
*2	Airbag ECU Assembly
*3	Instrument Panel Wire

(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 lower No. 1 instrument panel airbag assembly and airbag ECU assembly.

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 lower No. 1 instrument panel airbag assembly and airbag ECU 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 instrument panel wire connector (on the lower No. 1 instrument panel airbag assembly 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 instrument panel wire connector are not deformed or damaged.

OK:

The short springs are not deformed or damaged.

REPLACE INSTRUMENT PANEL WIRE

2.	CHECK LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY

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

Lower No. 1 Instrument Panel Airbag Assembly

Airbag ECU Assembly

Front view of wire harness connector

(to Lower No. 1 Instrument Panel Airbag Assembly)

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

CAUTION:

Never connect a tester to the lower No. 1 instrument panel airbag assembly for measurement, as this may lead to a serious injury due to airbag 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 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

OK:

DTC B1860, B1861, B1862 or B1863 is not output.

HINT:

Codes other than DTCs B1860, B1861, B1862 and B1863 may be output at this time, but they are not related to this check.

(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) Disconnect SST from connector C.

REPLACE LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY

3.	CHECK INSTRUMENT PANEL WIRE

(a) Disconnect the instrument panel wire from the airbag ECU assembly.

*1	Lower No. 1 Instrument Panel Airbag Assembly
*2	Airbag ECU Assembly
*3	Instrument Panel Wire
*a	Front view of wire harness connector (to Lower No. 1 Instrument Panel Airbag Assembly)

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

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

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

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
G55-1 (DK+) - Body ground	Engine switch on (IG)	Below 1 V
G55-2 (DK-) - Body ground	Engine switch on (IG)	Below 1 V

(4) Turn the engine switch off.

(5) 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.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G55-1 (DK+) - G55-2 (DK-)	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
G55-1 (DK+) - Body ground	Always	1 MΩ or higher
G55-2 (DK-) - 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
G55-1 (DK+) - G55-2 (DK-)	Always	1 MΩ or higher

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

REPLACE INSTRUMENT PANEL WIRE

CHECK DTC

(a) Connect the connectors to the lower No. 1 instrument panel airbag assembly and airbag ECU assembly.

*1	Lower No. 1 Instrument Panel Airbag Assembly
*2	Airbag ECU Assembly

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

(d) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(e) Turn the engine switch off.

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

(g) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

OK:

DTC B1860, B1861, B1862 or B1863 is not output.

HINT:

Codes other than DTCs B1860, B1861, B1862 and B1863 may be output at this time, but they are not related to this check.

USE SIMULATION METHOD TO CHECK

REPLACE AIRBAG ECU ASSEMBLY

Short in Knee Airbag (P Side) Squib Circuit (B1865-B1868)

DESCRIPTION

The front passenger side knee airbag squib circuit consists of the airbag ECU assembly and lower No. 2 instrument panel airbag assembly.

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

These DTCs are stored when a malfunction is detected in the front passenger side knee airbag squib circuit.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Test Mode / Check Mode
B1865	Short in Knee Airbag (P Side) Squib Circuit	The airbag ECU assembly detects a line short in the front passenger side knee airbag squib during the primary check. Front passenger side knee airbag squib malfunction Airbag ECU assembly malfunction	Instrument panel wire Front passenger side knee airbag squib (Lower No. 2 instrument panel airbag assembly) Airbag ECU assembly	Comes on	Applies to check mode
B1866	Open in Knee Airbag (P Side) Squib Circuit	The airbag ECU assembly detects an open in the front passenger side knee airbag squib. Front passenger side knee airbag squib malfunction Airbag ECU assembly malfunction	Instrument panel wire Front passenger side knee airbag squib (Lower No. 2 instrument panel airbag assembly) Airbag ECU assembly	Comes on	Applies to check mode
B1867	Short in Knee Airbag (P Side) Squib Circuit (to Ground)	The airbag ECU assembly detects a short to ground in the front passenger side knee airbag squib. Front passenger side knee airbag squib malfunction Airbag ECU assembly malfunction	Instrument panel wire Front passenger side knee airbag squib (Lower No. 2 instrument panel airbag assembly) Airbag ECU assembly	Comes on	Applies to check mode
B1868	Short in Knee Airbag (P Side) Squib Circuit (to +B)	The airbag ECU assembly detects a short to B+ in the front passenger side knee airbag squib. Front passenger side knee airbag squib malfunction Airbag ECU assembly malfunction	Instrument panel wire Front passenger side knee airbag squib (Lower No. 2 instrument panel airbag assembly) Airbag ECU assembly	Comes on	Applies to check mode

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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 engine switch off.

*1	Lower No. 2 Instrument Panel Airbag Assembly
*2	Airbag ECU Assembly
*3	Instrument Panel Wire

(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 lower No. 2 instrument panel airbag assembly and airbag ECU assembly.

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 lower No. 2 instrument panel airbag assembly and airbag ECU 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 instrument panel wire connector (on the lower No. 2 instrument panel airbag assembly 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 instrument panel wire connector are not deformed or damaged.

OK:

The short springs are not deformed or damaged.

REPLACE INSTRUMENT PANEL WIRE

2.	CHECK LOWER NO. 2 INSTRUMENT PANEL AIRBAG ASSEMBLY

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

Lower No. 2 Instrument Panel Airbag Assembly

Airbag ECU Assembly

Front view of wire harness connector

(to Lower No. 2 Instrument Panel Airbag Assembly)

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

CAUTION:

Never connect a tester to the lower No. 2 instrument panel airbag assembly for measurement, as this may lead to a serious injury due to airbag 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 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

OK:

DTC B1865, B1866, B1867 or B1868 is not output.

HINT:

Codes other than DTCs B1865, B1866, B1867 and B1868 may be output at this time, but they are not related to this check.

(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) Disconnect SST from connector C.

REPLACE LOWER NO. 2 INSTRUMENT PANEL AIRBAG ASSEMBLY

3.	CHECK INSTRUMENT PANEL WIRE

(a) Disconnect the instrument panel wire from the airbag ECU assembly.

*1	Lower No. 2 Instrument Panel Airbag Assembly
*2	Airbag ECU Assembly
*3	Instrument Panel Wire
*a	Front view of wire harness connector (to Lower No. 2 Instrument Panel Airbag Assembly)

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

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

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

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
G56-1 (PK+) - Body ground	Engine switch on (IG)	Below 1 V
G56-2 (PK-) - Body ground	Engine switch on (IG)	Below 1 V

(4) Turn the engine switch off.

(5) 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.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G56-1 (PK+) - G56-2 (PK-)	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
G56-1 (PK+) - Body ground	Always	1 MΩ or higher
G56-2 (PK-) - 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
G56-1 (PK+) - G56-2 (PK-)	Always	1 MΩ or higher

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

REPLACE INSTRUMENT PANEL WIRE

CHECK DTC

(a) Connect the connectors to the lower No. 2 instrument panel airbag assembly and airbag ECU assembly.

*1	Lower No. 2 Instrument Panel Airbag Assembly
*2	Airbag ECU Assembly

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

(d) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(e) Turn the engine switch off.

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

(g) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

OK:

DTC B1865, B1866, B1867 or B1868 is not output.

HINT:

Codes other than DTCs B1865, B1866, B1867 and B1868 may be output at this time, but they are not related to this check.

USE SIMULATION METHOD TO CHECK

REPLACE AIRBAG ECU ASSEMBLY

Short in P/T Squib (RH) Circuit (B1900-B1903)

DESCRIPTION

The front pretensioner squib RH circuit consists of the airbag ECU assembly and front seat outer belt assembly RH.

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

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Test Mode / Check Mode
B1900	Short in P/T Squib (RH) Circuit	The airbag ECU assembly detects a line short in the front pretensioner squib RH circuit during the primary check. Front pretensioner squib RH malfunction Airbag ECU assembly malfunction	Floor wire Front pretensioner squib RH (Front seat outer belt assembly RH) Airbag ECU assembly	Comes on	Applies to check mode
B1901	Open in P/T Squib (RH) Circuit	The airbag ECU assembly detects an open in the front pretensioner squib RH circuit. Front pretensioner squib RH malfunction Airbag ECU assembly malfunction	Floor wire Front pretensioner squib RH (Front seat outer belt assembly RH) Airbag ECU assembly	Comes on	Applies to check mode
B1902	Short in P/T Squib (RH) Circuit (to Ground)	The airbag ECU assembly detects a short to ground in the front pretensioner squib RH circuit. Front pretensioner squib RH malfunction Airbag ECU assembly malfunction	Floor wire Front pretensioner squib RH (Front seat outer belt assembly RH) Airbag ECU assembly	Comes on	Applies to check mode
B1903	Short in P/T Squib (RH) Circuit (to +B)	The airbag ECU assembly detects a short to B+ in the front pretensioner squib RH circuit. Front pretensioner squib RH malfunction Airbag ECU assembly malfunction	Floor wire Front pretensioner squib RH (Front seat outer belt assembly RH) Airbag ECU assembly	Comes on	Applies to check mode

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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 engine switch off.

*1	Front Seat Outer Belt Assembly RH
*2	Airbag ECU Assembly
*3	Floor Wire

(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.

HINT:

If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.

(d) Disconnect the connectors from the front seat outer belt assembly RH and airbag ECU 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 front 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 FRONT SEAT OUTER BELT ASSEMBLY RH

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

Front Seat Outer Belt Assembly RH

Airbag ECU Assembly

Front view of wire harness connector

(to Front Seat Outer Belt Assembly RH)

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

CAUTION:

Never connect a tester to the front 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 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

OK:

DTC B1900, B1901, B1902 or B1903 is not output.

HINT:

Codes other than DTCs B1900, B1901, B1902 and B1903 may be output at this time, but they are not related to this check.

(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) Disconnect SST from connector C.

REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH

3.	CHECK FLOOR WIRE

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

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

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

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

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

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
K46-1 (R+) - Body ground	Engine switch on (IG)	Below 1 V
K46-2 (R-) - Body ground	Engine switch on (IG)	Below 1 V

(4) Turn the engine switch off.

(5) 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.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
K46-1 (R+) - K46-2 (R-)	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
K46-1 (R+) - Body ground	Always	1 MΩ or higher
K46-2 (R-) - 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
K46-1 (R+) - K46-2 (R-)	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 front seat outer belt assembly RH and airbag ECU assembly.

*1	Front Seat Outer Belt Assembly RH
*2	Airbag ECU Assembly

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

(d) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(e) Turn the engine switch off.

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

(g) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

OK:

DTC B1900, B1901, B1902 or B1903 is not output.

HINT:

Codes other than DTCs B1900, B1901, B1902 and B1903 may be output at this time, but they are not related to this check.

USE SIMULATION METHOD TO CHECK

REPLACE AIRBAG ECU ASSEMBLY

Short in Curtain Shield Airbag (LH) Squib Circuit (B1835-B1838). Short in Rear Side Squib RH Circuit (B1850-B1853). Short in Rear Side Squib LH Circuit (B1855-B1858)

Short in P/T Squib (LH) Circuit (B1905-B1908). Short in Rear P/T Squib (RH) Circuit (B1920-B1923). Short in Rear P/T Squib (LH) Circuit (B1925-B1928)

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