Toyota Yaris: 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 |
|
| 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 |
|
| 3. | CHECK CONNECTORS |
| (a) Disconnect the connectors from the airbag sensor assembly and airbag cut off switch cylinder sub-assembly. |
|
(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 |
|
| 4. | INSPECT AIRBAG CUT OFF SWITCH CYLINDER SUB-ASSEMBLY |
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| NG |
 | REPLACE AIRBAG CUT OFF SWITCH CYLINDER SUB-ASSEMBLY |
|
| 5. | CHECK WIRE HARNESS (SHORT) |
| (a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| NG |
 | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 6. | CHECK WIRE HARNESS (SHORT TO GROUND) |
| (a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| NG |
 | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 7. | CHECK WIRE HARNESS (SHORT TO B+) |
| (a) Connect the cable to the negative (-) auxiliary battery terminal. |
|
(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 |
|
| 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. |
|
(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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Other information:
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Front Seat Belt Pretensioners
The front seat belt pretensioners are designed to deploy in moderate or severe frontal, near frontal collisions.
In addition, the pretensioners operate when a side collision or a rollover accident is detected. The pretensioners operate differently depending on what types of air bags are equipped. For more details about the seat belt pretensioner operation, refer to the SRS Air Bag Deployment Criteria.
