- The center airbag sensor receives a line short circuit signal 5 times in the front pretensioner squib LH circuit during the primary check.
- A front pretensioner squib LH malfunction.
- A center airbag sensor malfunction.
| Last Modified: 11-27-2007 | 1.6 C | |
| Service Category: Vehicle Interior | Section: Supplemental Restraint Systems | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000002O2U00IX |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DESCRIPTION (2008 LX570) | ||
|
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 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 |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1905/74 |
When one of the following conditions is met: |
|
|
B1906/74 |
When one of the following conditions is met:
|
|
|
B1907/74 |
When one of the following conditions is met:
|
|
|
B1908/74 |
When one of the following conditions is met:
|
|
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
-
w/ Navigation system:
After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.
-
When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected
.
HINT:
To perform the simulation method, enter the "check mode (signal check) with the Techstream
, and then wiggle each connector of the airbag system or drive the vehicle on various type of road
.
PROCEDURE
|
1. |
CHECK FRONT SEAT OUTER BELT LH (FRONT PRETENSIONER SQUIB LH) |
(a) Turn the engine switch off.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Disconnect the connectors from the front seat outer belt LH.
(d) 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:
- Do not forcibly insert SST into the terminals of the connector when connecting SST.
- Insert SST straight into the terminals of the connector.
SST: 09843-18061
(e) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(f) Turn the engine switch on (IG), and wait for at least 60 seconds.
(g) Clear the DTCs
.
(h) Turn the engine switch off.
(i) Turn the engine switch on (IG), and wait for at least 60 seconds.
(j) Check for DTCs
.
OK:
DTC B1905, B1906, B1907 or B1908 is not output.
HINT:
Codes other than DTC B1905, B1906, B1907 and B1908 may be output at this time, but they are not related to this check.
|
|
2. |
CHECK CONNECTOR |
(a) Turn the engine 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 floor wire connector (on the front seat outer belt LH side) is not damaged.
OK:
The lock button is not disengaged, and the claw of the lock is not deformed or damaged.
|
|
3. |
CHECK FLOOR WIRE (FRONT PRETENSIONER SQUIB LH CIRCUIT) |
(a) Disconnect the connectors from the center airbag sensor.
(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
K1-1 (L+) - Body ground |
Engine switch on (IG) |
Below 1 V |
|
K1-2 (L-) - Body ground |
Engine switch on (IG) |
Below 1 V |
(d) Turn the engine 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 |
|---|---|---|
|
K1-1 (L+) - K1-2 (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 |
|---|---|---|
|
K1-1 (L+) - K1-2 (L-) |
Always |
1 MΩ or higher |
|
K1-1 (L+) - Body ground |
Always |
1 MΩ or higher |
|
K1-2 (L-) - Body ground |
Always |
1 MΩ or higher |
|
|
4. |
CHECK CENTER AIRBAG SENSOR |
(a) Connect the connectors to the front seat outer belt LH and the center airbag sensor.
(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(c) Turn the engine switch on (IG), and wait for at least 60 seconds.
(d) Clear the DTCs
.
(e) Turn the engine switch off.
(f) Turn the engine switch on (IG), and wait for at least 60 seconds.
(g) Check for DTCs
.
OK:
DTC B1905, B1906, B1907 or B1908 is not output.
HINT:
Codes other than DTC B1905, B1906, B1907 and B1908 may be output at this time, but they are not related to this check.
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