- The center airbag sensor receives a line short circuit signal 5 times in the driver side squib circuit during primary check.
- Driver side squib malfunction
- Spiral cable 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: RM000000XFI043X |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
DTC |
B1800/51 |
Short in Driver Side Squib Circuit |
|
DTC |
B1801/51 |
Open in Driver Side Squib Circuit |
|
DTC |
B1802/51 |
Short to GND in Driver Side Squib Circuit |
|
DTC |
B1803/51 |
Short to B+ in Driver Side Squib Circuit |
DESCRIPTION
The driver side squib circuit consists of the center airbag sensor, the spiral cable, and the steering pad.
The circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are stored when a malfunction is detected in the driver side squib circuit.
|
DTC Code |
Detection Condition |
Trouble Area |
|---|---|---|
|
B1800/51 |
When one of following conditions is met: |
|
|
B1801/51 |
When one of following conditions is met:
|
|
|
B1802/51 |
When one of following conditions is met:
|
|
|
B1803/51 |
When one of following conditions is met:
|
|
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 steering pad.
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 steering pad.
(e) Check that the spiral cable connector (on the steering pad side) is not damaged.
OK:
The lock button is not disengaged, or the claw of the lock is not deformed or damaged.
|
|
2. |
CHECK STEERING PAD (DRIVER SIDE SQUIB) |
(a) Connect the white wire side of SST (resistance: 2.1 Ω) to connector E (orange connector).
CAUTION:
Never connect the tester to the steering pad (driver side squib) 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
(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 B1800, B1801, B1802, B1803 or 51 is not output.
HINT:
Codes other than DTC B1800, B1801, B1802, B1803 and 51 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 E.
(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 instrument panel wire connector with the activation prevention mechanism is not deformed or damaged.
OK:
The short spring is not deformed or damaged.
|
|
4. |
CHECK DRIVER SIDE SQUIB 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 |
|---|---|---|
|
z7-2 (D+) - Body ground |
Ignition switch ON |
Below 1 V |
|
z7-1 (D-) - 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 |
|---|---|---|
|
z7-2 (D+) - z7-1 (D-) |
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 |
|---|---|---|
|
z7-2 (D+) - z7-1 (D-) |
Always |
1 MΩ or higher |
|
z7-2 (D+) - Body ground |
Always |
1 MΩ or higher |
|
z7-1 (D-) - 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 steering pad 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 B1800, B1801, B1802, B1803 or 51 is not output.
HINT:
Codes other than DTC B1800, B1801, B1802, B1803 and 51 may be output at this time, but they are not related to this check.
|
|
6. |
CHECK CONNECTOR |
(a) Restore the released activation prevention mechanism of connector B to the original condition.
(b) Check that the connectors that link the spiral cable and instrument panel wire harness are properly connected.
OK:
The connectors are properly connected.
HINT:
If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.
(c) Disconnect the connectors that link the spiral cable and instrument panel wire.
(d) Check that the terminals of the connectors are not damaged.
OK:
The terminals are not deformed or damaged.
(e) Check that the short spring for the spiral cable connector with the activation prevention mechanism is not deformed or damaged.
OK:
The short spring is not deformed or damaged.
|
|
7. |
CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - SPIRAL CABLE) |
|
(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 |
|---|---|---|
|
H13-1 (D+) - Body ground |
Ignition switch ON |
Below 1 V |
|
H13-2 (D-) - 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 |
|---|---|---|
|
H13-1 (D+) - H13-2 (D-) |
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 |
|---|---|---|
|
H13-1 (D+) - H13-2 (D-) |
Always |
1 MΩ or higher |
|
H13-1 (D+) - Body ground |
Always |
1 MΩ or higher |
|
H13-2 (D-) - Body ground |
Always |
1 MΩ or higher |
|
|
|