- The center airbag sensor receives a line short circuit signal 5 times in the front pretensioner squib LH circuit during primary check.
- Front pretensioner squib LH malfunction
- Center airbag sensor malfunction
| Last Modified: 11-29-2007 | 1.6 C | |
| Service Category: Vehicle Interior | Section: Supplemental Restraint Systems | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000002O2U00JX |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
DTC |
B1900/73 |
Short in Front Driver Side Pretensioner Squib Circuit |
|
DTC |
B1901/73 |
Open in Front Driver Side Pretensioner Squib Circuit |
|
DTC |
B1902/73 |
Short to GND in Front Driver Side Pretensioner Squib Circuit |
|
DTC |
B1903/73 |
Short to B+ in Front Driver Side Pretensioner Squib Circuit |
DESCRIPTION
The front pretensioner squib LH circuit consists of the center airbag sensor and the front seat outer belt LH.
This circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are stored when a malfunction is detected in the front pretensioner squib LH circuit.
|
DTC Code |
Detection Condition |
Trouble Area |
|---|---|---|
|
B1900/73 |
When one of following conditions is met: |
|
|
B1901/73 |
When one of following conditions is met:
|
|
|
B1902/73 |
When one of following conditions is met:
|
|
|
B1903/73 |
When one of following conditions is met:
|
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WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
-
Perform the simulation method by selecting "check mode" (signal check) with the Techstream
.
-
After selecting "check mode" (signal check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on various types of roads
.
PROCEDURE
|
1. |
CHECK CONNECTOR |
(a) Turn the ignition switch off.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Check that the connector is properly connected to the front seat outer belt LH.
OK:
The connector is properly connected.
HINT:
If the connector is not connected securely, reconnect the connector and proceed to the next inspection.
(d) Disconnect the connector from the front seat outer belt LH.
(e) Check that the floor wire connector (on the front seat outer belt LH side) is not damaged.
OK:
The lock button is not disengaged, or the claw of the lock is not deformed or damaged.
|
|
2. |
CHECK FRONT SEAT OUTER BELT LH (FRONT PRETENSIONER SQUIB LH) |
|
(a) Connect the white wire side of SST (resistance: 2.1 Ω) to connector C. CAUTION:
Never connect the tester to the front seat outer belt LH (front pretensioner squib LH) for measurement, as this may lead to a serious injury due to airbag deployment. NOTICE:
|
SST: 09843-18061
(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(c) Turn the ignition switch to ON, and wait for at least 60 seconds.
(d) Clear the DTCs
.
(e) Turn the ignition switch off.
(f) Turn the ignition switch to ON, and wait for at least 60 seconds.
(g) Check for DTCs
.
OK:
DTC B1900, B1901, B1902, B1903 or 73 is not output.
HINT:
Codes other than DTC B1900, B1901, B1902, B1903 and 73 may be output at this time, but they are not related to this check.
|
|
3. |
CHECK CONNECTOR |
(a) Turn the ignition switch off.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Disconnect SST from connector C.
(d) Check that the connector is properly connected to the center airbag sensor assembly.
OK:
The connector is properly connected.
HINT:
If the connector is not connected securely, reconnect the connector and proceed to the next inspection.
(e) Disconnect the connector from the center airbag sensor assembly.
(f) Check that the terminal of the connector is not damaged.
OK:
The terminal is not deformed or damaged.
(g) Check that the short spring for the floor wire connector with the activation prevention mechanism is not deformed or damaged.
OK:
The short spring is not deformed or damaged.
|
|
4. |
CHECK FLOOR WIRE (FRONT PRETENSIONER SQUIB LH CIRCUIT) |
|
(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds. |
(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 |
|---|---|---|
|
O9-1 (L+) - Body ground |
Ignition switch ON |
Below 1 V |
|
O9-2 (L-) - Body ground |
Ignition switch ON |
Below 1 V |
(d) Turn the ignition switch off.
(e) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(f) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
O9-1 (L+) - O9-2 (L-) |
Always |
Below 1 Ω |
(g) Release the activation prevention mechanism built into connector B
.
(h) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
O9-1 (L+) - O9-2 (L-) |
Always |
1 MΩ or higher |
|
O9-1 (L+) - Body ground |
Always |
1 MΩ or higher |
|
O9-2 (L-) - Body ground |
Always |
1 MΩ or higher |
|
|
5. |
CHECK CENTER AIRBAG SENSOR |
|
(a) Restore the released activation prevention mechanism of connector B to the original condition. |
(b) Connect the connectors to the front seat outer belt LH and the center airbag sensor.
(c) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(d) Turn the ignition switch to ON, and wait for at least 60 seconds.
(e) Clear the DTCs
.
(f) Turn the ignition switch off.
(g) Turn the ignition switch to ON, and wait for at least 60 seconds.
(h) Check for DTCs
.
OK:
DTC B1900, B1901, B1902, B1903 or 73 is not output.
HINT:
Codes other than DTC B1900, B1901, B1902, B1903 and 73 may be output at this time, but they are not related to this check.
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