Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Short in Knee Airbag (D Side) Squib Circuit (B1860-B1863)

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)

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.

NG

REPLACE INSTRUMENT PANEL WIRE
OK

2.

CHECK LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY

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

*1

Lower No. 1 Instrument Panel Airbag Assembly

*2

Airbag ECU Assembly

*a

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

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

(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.

OK

REPLACE LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY

NG

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.

(c) Check for an open 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+) - 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.

NG

REPLACE INSTRUMENT PANEL WIRE
OK

4.

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.

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

(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.

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE AIRBAG ECU ASSEMBLY

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