Toyota CH-R Service Manual: Trouble in Passenger Airbag ON/OFF Indicator

Toyota CH-R Service Manual / 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:

Approximately 6 seconds after the ignition switch is turned ON, the passenger airbag ON/OFF indicator will indicate ON/OFF depending on the following conditions.

Airbag Cut Off Switch Cylinder Sub-assembly

Passenger Airbag ON/OFF Indicator

SRS Warning Light

ON Indicator

OFF Indicator

ON

ON

OFF

OFF

OFF

OFF

ON

OFF

Switch failure

OFF

ON

ON

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After turning the ignition 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:

Terminals F70-11 (MSW+) and F70-12 (MSW-) of the instrument panel wire in this circuit have an activation prevention mechanism.

This mechanism can be used to check for an open circuit in the wire harness. When performing other checks (check for short, short to ground or short to B+), this mechanism should be released.

PROCEDURE

1.

CHECK SRS WARNING LIGHT

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

OK:

After the primary check period, the SRS warning light goes 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 ON.
NG

GO TO DIAGNOSTIC TROUBLE CODE CHART

OK

2.

CHECK CONNECTORS

(a) Turn the ignition 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 airbag sensor assembly and airbag cut off switch cylinder sub-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 airbag sensor assembly and airbag cut off switch cylinder sub-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 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

3.

CHECK INSTRUMENT PANEL WIRE (OPEN)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F64-2 (PMC+) - F64-1 (PMC-)

Always

Below 1 Ω

*1

Airbag Cut Off Switch Cylinder Sub-assembly

*2

Airbag Sensor Assembly

*3

Instrument Panel Wire

*a

Front view of wire harness connector

(to Airbag Cut Off Switch Cylinder Sub-assembly)
NG

REPLACE INSTRUMENT PANEL WIRE
OK

4.

CHECK INSTRUMENT PANEL WIRE (SHORT)

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

Click here

*1

Airbag Cut Off Switch Cylinder Sub-assembly

*2

Airbag Sensor Assembly

*3

Instrument Panel Wire

*a

Front view of wire harness connector

(to Airbag Cut Off Switch Cylinder Sub-assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F64-2 (PMC+) - F64-1 (PMC-)

Always

1 MΩ or higher
NG

REPLACE INSTRUMENT PANEL WIRE
OK

5.

CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)

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

*1

Airbag Cut Off Switch Cylinder Sub-assembly

*2

Airbag Sensor Assembly

*3

Instrument Panel Wire

*a

Front view of wire harness connector

(to Airbag Cut Off Switch Cylinder Sub-assembly)

(b) Turn the ignition switch ON.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F64-2 (PMC+) - Body ground

Ignition switch ON

Below 1 V

F64-1 (PMC-) - Body ground

Ignition switch ON

Below 1 V

(d) Turn the ignition switch off.

(e) 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.

NG

REPLACE INSTRUMENT PANEL WIRE
OK

6.

CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F64-2 (PMC+) - Body ground

Always

1 MΩ or higher

F64-1 (PMC-) - Body ground

Always

1 MΩ or higher

*1

Airbag Cut Off Switch Cylinder Sub-assembly

*2

Airbag Sensor Assembly

*3

Instrument Panel Wire

*a

Front view of wire harness connector

(to Airbag Cut Off Switch Cylinder Sub-assembly)

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

NG

REPLACE INSTRUMENT PANEL WIRE
OK

7.

CHECK AIRBAG CUT OFF SWITCH CYLINDER SUB-ASSEMBLY

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

2 (PMC+) - 1 (PMC-)

Cut off switch in ON position

360 to 440 Ω

2 (PMC+) - 1 (PMC-)

Cut off switch in OFF position

90 to 110 Ω

*a

Component without harness connected

(Airbag Cut Off Switch Cylinder Sub-assembly)
OK

REPLACE AIRBAG SENSOR ASSEMBLY

NG

REPLACE AIRBAG CUT OFF SWITCH CYLINDER SUB-ASSEMBLY

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