- Center airbag sensor assembly detects line short circuit signal in driver side squib circuit 5 times during primary check.
- Driver side squib malfunction
- Spiral cable malfunction
- Center airbag sensor assembly malfunction
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VJQM |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - ] |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1800/51-B1803/51; Short in Driver Side Squib Circuit; 2016 - 2020 MY Sienna [12/2015 - ] | ||
|
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 assembly, the spiral cable and the steering pad.
- The circuit signals the SRS to deploy when deployment conditions are met.
- These DTCs are recorded when a malfunction is detected in the driver side squib circuit.
|
DTC No. |
DTC 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
CAUTION / NOTICE / HINT
HINT:
-
Perform the simulation method by selecting Check Mode (signal check) with the Techstream (See page
![2016 - 2020 MY Sienna [12/2015 - ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: CHECK MODE PROCEDURE](/t3Portal/stylegraphics/info.gif)
).
-
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 street or rough road (See page
).
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.
| NG |
|
|
|
2. |
INSPECT STEERING PAD (DRIVER SIDE SQUIB) |
SST: 09843-18061
(a) Disconnect the connector from the steering pad.
Text in Illustration
|
*1 |
Driver Side Squib |
*2 |
Spiral Cable |
|
*3 |
Center Airbag Sensor Assembly |
*4 |
Connector E |
|
*5 |
Color: Orange |
*6 |
DTC 51 |
|
*a |
Front view of wire harness connector (to Driver Side Squib) |
*b |
Front view of DLC3 |
(b) Connect SST (resistance 2.1 Ω) to connector E (orange connector).
CAUTION:
Never connect a 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.
- Insert SST straight into the terminals of the connector.
(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 stored in the memory (See page
).
(f) Turn the ignition switch off.
(g) Turn the ignition switch to ON, and wait for at least 60 seconds.
(h) Turn the steering wheel lock to lock 5 times or more.
(i) Check the DTCs (See page
).
OK:
DTC B1800/51, B1801/51, B1802/51 or B1803/51 is not output.
HINT:
DTCs other than B1800/51, B1801/51, B1802/51 and B1803/51 may be output at this time, but they are not related to this check.
| OK |
|
|
|
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 the SST from connector E.
(d) 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.
(e) Disconnect the connectors that link the spiral cable and instrument panel wire.
(f) Check that the terminals of the connectors are not damaged.
OK:
The terminals are not deformed or damaged.
(g) 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.
| NG |
|
REPLACE SPIRAL CABLE OR INSTRUMENT PANEL WIRE |
|
|
4. |
CHECK SPIRAL CABLE (DRIVER SIDE SQUIB - INSTRUMENT PANEL WIRE) |
|
(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 |
|---|---|---|
|
z4-1 (D-) - Body ground |
Ignition switch ON |
Below 1 V |
|
z4-2 (D+) - Body ground |
Ignition switch ON |
Below 1 V |
Text in Illustration
|
*1 |
Driver Side Squib |
|
*2 |
Spiral Cable |
|
*3 |
Instrument Panel Wire |
|
*4 |
Center Airbag Sensor Assembly |
|
*5 |
Connector E |
|
*6 |
Color: Orange |
|
*a |
Front view of wire harness connector (to Driver Side Squib) |
(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 |
|---|---|---|
|
z4-1 (D-) - z4-2 (D+) |
Always |
Below 1 Ω |
(g) Release the activation prevention mechanism built into connector D (See page
).
(h) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
z4-1 (D-) - z4-2 (D+) |
Always |
1 MΩ or higher |
|
z4-1 (D-) - Body ground |
Always |
1 MΩ or higher |
|
z4-2 (D+) - Body ground |
Always |
1 MΩ or higher |
(i) Restore the released activation prevention mechanism of connector D to the original condition.
| NG |
|
|
|
5. |
CHECK CONNECTOR |
(a) 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.
(b) Disconnect the connector from the center airbag sensor assembly.
(c) Check that the terminal of the connector is not damaged.
OK:
The terminal is not deformed or damaged.
(d) 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.
| NG |
|
REPLACE INSTRUMENT PANEL WIRE |
|
|
6. |
CHECK INSTRUMENT PANEL WIRE (SPIRAL CABLE - CENTER AIRBAG SENSOR ASSEMBLY) |
|
(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 |
|---|---|---|
|
D20-1 (D+) - Body ground |
Ignition switch ON |
Below 1 V |
|
D20-2 (D-) - Body ground |
Ignition switch ON |
Below 1 V |
Text in Illustration
|
*1 |
Driver Side Squib |
|
*2 |
Spiral Cable |
|
*3 |
Instrument Panel Wire |
|
*4 |
Center Airbag Sensor Assembly |
|
*5 |
Connector C |
|
*a |
Rear view of wire harness connector (to Spiral Cable) |
(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 |
|---|---|---|
|
D20-1 (D+) - D20-2 (D-) |
Always |
Below 1 Ω |
(g) Release the activation prevention mechanism built into connector B (See page
).
(h) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D20-1 (D+) - D20-2 (D-) |
Always |
1 MΩ or higher |
|
D20-1 (D+) - Body ground |
Always |
1 MΩ or higher |
|
D20-2 (D-) - Body ground |
Always |
1 MΩ or higher |
(i) Restore the released activation prevention mechanism of connector B to the original condition.
| NG |
|
REPLACE INSTRUMENT PANEL WIRE |
|
|
7. |
CHECK CENTER AIRBAG SENSOR ASSEMBLY |
|
(a) Connect the connectors to the steering pad, spiral cable and the center airbag sensor assembly. |
|
(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 stored in the memory (See page
).
(e) Turn the ignition switch off.
(f) Turn the ignition switch to ON, and wait for at least 60 seconds.
(g) Check the DTCs (See page
).
OK:
DTC B1800/51, B1801/51, B1802/51 or B1803/51 is not output.
Text in Illustration
|
*1 |
Driver Side Squib |
|
*2 |
Spiral Cable |
|
*3 |
Center Airbag Sensor Assembly |
|
*4 |
DTC 51 |
|
*a |
Front view of DLC3 |
HINT:
DTCs other than B1800/51, B1801/51, B1802/51 and B1803/51 may be output at this time, but they are not related to this check.
| OK |
|
| NG |
|
|
|