Toyota Yaris: Airbag System / Trouble in Passenger Airbag ON/OFF Indicator

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Supplemental Restraint Systems / Airbag System / Trouble in Passenger Airbag ON/OFF Indicator

DESCRIPTION

This circuit detects the airbag cut off switch cylinder sub-assembly status.

The passenger airbag ON/OFF indicator comes on to inform the driver of the instrument panel passenger without door airbag assembly status (activated or deactivated).

HINT:

Refer to the normal condition of the passenger airbag ON/OFF indicator.

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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.

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HINT:

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.

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PROCEDURE

1.

CHECK SRS WARNING LIGHT

(a) Turn the ignition switch to ON, and check the SRS warning light condition.

OK:

After the primary check period, the SRS warning light turns off.

HINT:

  • If the SRS warning light is on when this malfunction occurs, a DTC is stored. Troubleshoot for the stored DTC.
  • The primary check period is approximately 6 seconds after the ignition switch is turned to ON.
NG

GO TO DIAGNOSTIC TROUBLE CODE CHART

OK

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 airbag sensor assembly and airbag cut off switch cylinder sub-assembly.

OK:

The connectors are properly connected.

NG

CONNECT CONNECTORS PROPERLY

OK

3.

CHECK CONNECTORS

(a) Disconnect the connectors from the airbag sensor assembly and airbag cut off switch cylinder sub-assembly.

*1

Airbag Cut Off Switch Cylinder Sub-assembly

*2

Airbag Sensor Assembly

*3

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.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

INSPECT AIRBAG CUT OFF SWITCH CYLINDER SUB-ASSEMBLY

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NG

REPLACE AIRBAG CUT OFF SWITCH CYLINDER SUB-ASSEMBLY

OK

5.

CHECK WIRE HARNESS (SHORT)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H15-2 (PMC+) - H15-1 (PMC-)

Always

1 MΩ or higher

*1

Airbag Cut Off Switch Cylinder Sub-assembly

*2

Airbag Sensor Assembly

*3

Wire Harness

*a

Front view of wire harness connector

(to Airbag Cut Off Switch Cylinder Sub-assembly)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

CHECK WIRE HARNESS (SHORT TO GROUND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H15-2 (PMC+) - Body ground

Always

1 MΩ or higher

H15-1 (PMC-) - Body ground

Always

1 MΩ or higher

*1

Airbag Cut Off Switch Cylinder Sub-assembly

*2

Airbag Sensor Assembly

*3

Wire Harness

*a

Front view of wire harness connector

(to Airbag Cut Off Switch Cylinder Sub-assembly)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

CHECK WIRE HARNESS (SHORT TO B+)

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

*1

Airbag Cut Off Switch Cylinder Sub-assembly

*2

Airbag Sensor Assembly

*3

Wire Harness

*a

Front view of wire harness connector

(to Airbag Cut Off Switch Cylinder Sub-assembly)

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

H15-2 (PMC+) - Body ground

Ignition switch ON

Below 1 V

H15-1 (PMC-) - Body ground

Ignition switch ON

Below 1 V

(d) Turn the ignition switch off.

(e) 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.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

CHECK WIRE HARNESS (OPEN)

(a) Using a service wire, connect terminals 22 (MSW+) and 21 (MSW-) of connector B.

NOTICE:

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

*1

Airbag Cut Off Switch Cylinder Sub-assembly

*2

Airbag Sensor Assembly

*3

Wire Harness

*4

Service Wire

*a

Front view of wire harness connector

(to Airbag Cut Off Switch Cylinder Sub-assembly)

*b

Front view of wire harness connector

(to Airbag Sensor Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H15-2 (PMC+) - H15-1 (PMC-)

Always

Below 1 Ω

(c) Disconnect the service wire from connector B.

OK

REPLACE AIRBAG SENSOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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