Toyota Yaris: Airbag System / Driver Frontal Stage 1 Deployment Control Circuit Resistance Below Threshold (B00011A)

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Supplemental Restraint Systems / Airbag System / Driver Frontal Stage 1 Deployment Control Circuit Resistance Below Threshold (B00011A)

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Test Mode / Check Mode

B00011A

Driver Frontal Stage 1 Deployment Control Circuit Resistance Below Threshold
  • The airbag sensor assembly detects a line short in the driver seat airbag squib circuit for 2 seconds during the primary check
  • Spiral cable sub-assembly malfunction
  • Horn button assembly malfunction
  • Airbag sensor assembly malfunction
  • Harness or connector
  • Spiral cable sub-assembly
  • Horn button assembly
  • Airbag sensor assembly

Comes on

Applies to check mode

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.

Click here

HINT:

  • To perform the simulation method, select Check Mode with the GTS.

    Click here

  • Perform the simulation method while checking the Data List.

    Click here

  • When disconnecting and reconnecting the cable to the auxiliary battery terminal, there is an automatic learning function that completes learning when the respective system is used.

    Click here

PROCEDURE

1.

CHECK CURRENT DTC

(a) Turn the ignition switch to ON, and wait for at least 60 seconds.

(b) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

Result

Proceed to

Current B00011A is output

A

History B00011A is output

B
B

USE SIMULATION METHOD TO CHECK

A

2.

CHECK CONNECTION OF CONNECTORS

(a) Turn the ignition switch off.

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

CAUTION:

Wait at least 60 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

(c) Check that the connectors are properly connected to the horn button assembly, spiral cable sub-assembly and airbag sensor assembly.

OK:

The connectors are properly connected.

NG

CONNECT CONNECTORS PROPERLY
OK

3.

CHECK CONNECTORS

(a) Disconnect the connectors from the horn button assembly, spiral cable sub-assembly and airbag sensor assembly.

*1

Horn Button Assembly

*2

Spiral Cable Sub-assembly

*3

Airbag Sensor Assembly

*4

Wire Harness

(b) Check that the terminals of the connectors are not deformed or damaged.

OK:

The terminals of the connectors are not deformed or damaged.

(c) Check that the short springs of the activation prevention mechanisms of the wire harness connector and spiral cable sub-assembly connector are not deformed or damaged.

OK:

The short springs are not deformed or damaged.

(d) Check that the spiral cable sub-assembly connector (on the horn button 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.

NG

REPLACE SPIRAL CABLE SUB-ASSEMBLY OR REPAIR OR REPLACE WIRE HARNESS
OK

4.

CHECK HORN BUTTON ASSEMBLY

(a) Connect the connectors to the airbag sensor assembly and spiral cable sub-assembly.

*1

Horn Button Assembly

*2

Spiral Cable Sub-assembly

*3

Airbag Sensor Assembly

*a

Front view of wire harness connector

(to Horn Button Assembly)

*b

Color: Light Green

(b) Connect the white wire side of SST (resistance 2.1 Ω) to connector E (light green connector).

CAUTION:

Never connect a tester to the horn button 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 (-) auxiliary battery terminal.

(d) Turn the ignition switch to ON, and wait for at least 60 seconds.

(e) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(f) Turn the ignition switch off.

NEXT

5.

CHECK HORN BUTTON ASSEMBLY

(a) Turn the ignition switch to ON, and wait for at least 60 seconds.

(b) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTC B00011A may be output at this time, but they are not related to this check.

Result

Proceed to

B00011A is not output

A

B00011A is output

B

(c) Turn the ignition switch off.

(d) Disconnect the cable from the negative (-) auxiliary battery terminal.

CAUTION:

Wait at least 60 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

(e) Disconnect SST from connector E.

A

REPLACE HORN BUTTON ASSEMBLY

B

6.

CHECK DRIVER SEAT AIRBAG SQUIB CIRCUIT (SHORT)

(a) Disconnect the connector from the airbag sensor assembly.

*1

Horn Button Assembly

*2

Spiral Cable Sub-assembly

*3

Airbag Sensor Assembly

*4

Wire Harness

*a

Front view of wire harness connector

(to Horn Button Assembly)

*b

Color: Light Green

(b) Release the activation prevention mechanism built into connector B.

HINT:

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

z3-2 - z3-1

Always

1 MΩ or higher

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

NG

GO TO STEP 9

OK

7.

CLEAR DTC

(a) Connect the connectors to the horn button assembly and airbag sensor assembly.

*1

Horn Button Assembly

*2

Spiral Cable Sub-assembly

*3

Airbag Sensor Assembly

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

(c) Turn the ignition switch to ON, and wait for at least 60 seconds.

(d) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(e) Turn the ignition switch off.

NEXT

8.

CHECK DTC

(a) Turn the ignition switch to ON, and wait for at least 60 seconds.

(b) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTC B00011A may be output at this time, but they are not related to this check.

Result

Proceed to

B00011A is not output

A

B00011A is output

B
A

USE SIMULATION METHOD TO CHECK

B

REPLACE AIRBAG SENSOR ASSEMBLY

9.

CHECK WIRE HARNESS (SHORT)

(a) Disconnect the connector from the spiral cable sub-assembly.

*1

Horn Button Assembly

*2

Spiral Cable Sub-assembly

*3

Airbag Sensor Assembly

*4

Wire Harness

*a

Front view of wire harness connector

(to Spiral Cable Sub-assembly)

(b) Release the activation prevention mechanism built into connector B.

HINT:

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H38-1 (D+) - H38-2 (D-)

Always

1 MΩ or higher

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

OK

REPLACE SPIRAL CABLE SUB-ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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