CHECK FRONT SEAT OUTER BELT ASSEMBLY LH (FRONT PRETENSIONER SQUIB LH)
CHECK FLOOR WIRE (FRONT PRETENSIONER SQUIB LH CIRCUIT)
CHECK CENTER AIRBAG SENSOR ASSEMBLY
DTC B1905/74 Short in Front Pretensioner Squib LH Circuit |
DTC B1906/74 Open in Front Pretensioner Squib LH Circuit |
DTC B1907/74 Short to GND in Front Pretensioner Squib LH Circuit |
DTC B1908/74 Short to B+ in Front Pretensioner Squib LH Circuit |
DESCRIPTION
The front pretensioner squib LH circuit consists of the center airbag sensor assembly and the front seat outer belt assembly LH.This circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are recorded when a malfunction is detected in the front pretensioner squib LH circuit.
| DTC No. | DTC Detection Condition | Trouble Area |
| B1905/74 |
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| B1906/74 |
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| B1907/74 |
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| B1908/74 |
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WIRING DIAGRAM
INSPECTION PROCEDURE
- HINT:
- Perform the simulation method by selecting Check Mode (signal check) using the Techstream (COROLLA_ZRE142 RM000000XFF0COX.html).
- 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 or rough road (COROLLA_ZRE142 RM000000XFD0GSX.html).
| 1.CHECK CONNECTORS |
Turn the ignition switch off.
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Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
Check that the connectors are properly connected to the front seat outer belt assembly LH and center airbag sensor assembly.
- OK:
- The connectors are properly connected.
- HINT:
- If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.
Disconnect the connectors from the front seat outer belt assembly LH and center airbag sensor assembly.
Check that the terminals of the connectors are not damaged.
- OK:
- The terminals are not deformed or damaged.
Check that the floor wire connector (on the front seat outer belt assembly LH side) is not damaged.
- OK:
- The lock button is not disengaged, or the claw of the lock is not deformed or damaged.
Check that the short spring for the floor wire with the activation prevention mechanism is not deformed or damaged.
- OK:
- The short spring is not deformed or damaged.
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| OK | |
| 2.CHECK FRONT SEAT OUTER BELT ASSEMBLY LH (FRONT PRETENSIONER SQUIB LH) |
Connect the connector to the center airbag sensor assembly.
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Connect SST (resistance 2.1 Ω) to connector C.
- CAUTION:
- Never connect the tester to the front seat outer belt assembly LH (front pretensioner squib LH) 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.
- Insert SST straight into the terminals of the connector.
- SST
- 09843-18061
Connect the cable to the negative (-) battery terminal.
Turn the ignition switch to ON, and wait for at least 60 seconds.
Clear the DTCs stored in the memory (COROLLA_ZRE142 RM000000XFE0H1X.html).
Turn the ignition switch off.
Turn the ignition switch to ON, and wait for at least 60 seconds.
Check for DTCs (COROLLA_ZRE142 RM000000XFE0H1X.html).
- OK:
- DTC B1905, B1906, B1907, B1908, or 74 is not output.
- HINT:
- Codes other than DTC B1905, B1906, B1907, B1908, and 74 may be output at this time, but they are not related to this check.
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| OK | ||
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| 3.CHECK FLOOR WIRE (FRONT PRETENSIONER SQUIB LH CIRCUIT) |
Turn the ignition switch off.
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Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
Disconnect SST from connector C.
Disconnect the connector from the center airbag sensor assembly.
Check for a short to B+ in the circuit.
Connect the cable to the negative (-) battery terminal.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection Switch Condition Specified Condition L4-1 (L+) - Body ground Ignition switch ON Below 1 V L4-2 (L-) - Body ground Ignition switch ON Below 1 V
Check for an open in the circuit.
Turn the ignition switch off.
Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition L4-1 (L+) - L4-2 (L-) Always Below 1 Ω
Check for a short to ground in the circuit.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition L4-1 (L+) - Body ground Always 1 MΩ or higher L4-2 (L-) - Body ground Always 1 MΩ or higher
Check for a short in the circuit.
Release the activation prevention mechanism built into connector B (COROLLA_ZRE142 RM000000XFD0GSX.html).
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition L4-1 (L+) - L4-2 (L-) Always 1 MΩ or higher
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| OK | |
| 4.CHECK CENTER AIRBAG SENSOR ASSEMBLY |
Restore the released activation prevention mechanism of connector B to the original condition.
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Connect the connectors to the front seat outer belt assembly LH and the center airbag sensor assembly.
Connect the cable to the negative (-) battery terminal.
Turn the ignition switch to ON, and wait for at least 60 seconds.
Clear the DTCs stored in the memory (COROLLA_ZRE142 RM000000XFE0H1X.html).
Turn the ignition switch off.
Turn the ignition switch to ON, and wait for at least 60 seconds.
Check for DTCs (COROLLA_ZRE142 RM000000XFE0H1X.html).
- OK:
- DTC B1905, B1906, B1907, B1908, or 74 is not output.
- HINT:
- Codes other than DTC B1905, B1906, B1907, B1908, and 74 may be output at this time, but they are not related to this check.
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| OK | ||
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