- The center airbag sensor assembly receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the front airbag sensor LH circuit for 2 seconds.
- Front airbag sensor LH malfunction
- Center airbag sensor assembly malfunction
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VJR4 |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - ] |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1617/84,B1618/84; Lost Communication with Front Airbag Sensor LH; 2016 - 2020 MY Sienna [12/2015 - ] | ||
|
DTC |
B1617/84 |
Lost Communication with Front Airbag Sensor LH |
|
DTC |
B1618/84 |
Front Airbag Sensor LH Initialization Incomplete |
DESCRIPTION
The front airbag sensor LH circuit consists of the center airbag sensor assembly and front airbag sensor LH.
The front airbag sensor LH detects impacts to the vehicle and sends signals to the center airbag sensor to determine if the airbag should be deployed.
DTC B1617/84 or B1618/84 is recorded when a malfunction is detected in the front airbag sensor LH circuit.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1617/84 B1618/84 |
When one of following conditions is met: |
|
WIRING DIAGRAM
PROCEDURE
|
1. |
CHECK FOR DTC |
(a) Turn the ignition switch off.
(b) Turn the ignition switch to ON, and wait for at least 60 seconds.
(c) Check for DTCs (See page
![2016 - 2020 MY Sienna [12/2015 - ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
).
OK:
DTC B161A/8A is not output.
| NG |
|
|
|
2. |
CHECK CONNECTION OF CONNECTORS |
(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 connectors are properly connected to the center airbag sensor assembly and the front airbag sensor LH.
OK:
The connectors are properly connected.
| NG |
|
CONNECT CONNECTORS PROPERLY |
|
|
3. |
CHECK CONNECTORS |
(a) Disconnect the connectors from the center airbag sensor assembly and front airbag sensor LH.
(b) Check that the connectors (on the center airbag sensor assembly side and front airbag sensor LH side) are not damaged.
OK:
The connectors are not deformed or damaged.
| NG |
|
REPLACE HARNESS AND CONNECTOR |
|
|
4. |
CHECK FRONT AIRBAG SENSOR LH CIRCUIT |
Text in Illustration
|
*1 |
Front Airbag Sensor LH |
*2 |
Center Airbag Sensor Assembly |
|
*3 |
Connector E |
*4 |
Connector B |
|
*5 |
Service Wire |
- |
- |
|
*a |
Front view of wire harness connector (to Front Airbag Sensor LH) |
*b |
Rear view of wire harness connector (to 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 |
|---|---|---|
|
A38-2 (+SL) - Body ground |
Ignition switch ON |
Below 1 V |
|
A38-1 (-SL) - 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) Using a service wire, connect terminals 30 (+SL) and 28 (-SL) of connector B.
NOTICE:
Do not forcibly insert a service wire into the terminals of the connector when connecting the wire.
(g) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A38-2 (+SL) - A38-1 (-SL) |
Always |
Below 1 Ω |
(h) Disconnect the service wire from connector B.
(i) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A38-2 (+SL) - A38-1 (-SL) |
Always |
1 MΩ or higher |
|
A38-2 (+SL) - Body ground |
Always |
1 MΩ or higher |
|
A38-1 (-SL) - Body ground |
Always |
1 MΩ or higher |
| NG |
|
|
|
5. |
CHECK FRONT AIRBAG SENSOR LH |
(a) Connect the connectors to the center airbag sensor assembly.
(b) Interchange the front airbag sensor LH with RH and connect the connectors to them.
(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) Check for DTCs (See page
).
Result
|
Result |
Proceed to |
|---|---|
|
DTC B1617/84 or B1618/84 is output |
A |
|
DTC B1612/83 or B1613/83 is output |
B |
|
DTC B1612/83, B1613/83, B1617/84 and B1618/84 are not output |
C |
Text in Illustration
|
*1 |
Front Airbag Sensor RH |
|
*2 |
Center Airbag Sensor Assembly |
HINT:
DTCs other than B1612/83, B1613/83, B1617/84 and B1618/84 may be output at this time, but they are not related to this check.
| C |
|
| A |
|
| B |
|
|
6. |
CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR ASSEMBLY - ENGINE ROOM MAIN WIRE) |
Text in Illustration
|
*1 |
Front Airbag Sensor LH |
*2 |
Center Airbag Sensor Assembly |
|
*3 |
Engine Room Main Wire |
*4 |
Instrument Panel Wire |
|
*5 |
Connector C |
*6 |
Connector B |
|
*7 |
Service Wire |
- |
- |
|
*a |
Front view of wire harness connector (to Engine Room Main Wire) |
*b |
Rear view of wire harness connector (to Center Airbag Sensor Assembly) |
(a) Disconnect the instrument panel wire connector from the engine room main wire.
(b) Connect the cable to the negative battery terminal, and wait for at least 2 seconds.
(c) Turn the ignition switch to ON.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
DA1-2 (+SL) - Body ground |
Ignition switch ON |
Below 1 V |
|
DA1-1 (-SL) - Body ground |
Ignition switch ON |
Below 1 V |
(e) Turn the ignition switch off.
(f) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(g) Using a service wire, connect terminals 30 (+SL) and 28 (-SL) of connector B.
NOTICE:
Do not forcibly insert a service wire into the terminals of the connector when connecting the wire.
(h) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
DA1-2 (+SL) - DA1-1 (-SL) |
Always |
Below 1 Ω |
(i) Disconnect the service wire from connector B.
(j) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
DA1-2 (+SL) - DA1-1 (-SL) |
Always |
1 MΩ or higher |
|
DA1-2 (+SL) - Body ground |
Always |
1 MΩ or higher |
|
DA1-1 (-SL) - Body ground |
Always |
1 MΩ or higher |
| OK |
|
REPLACE ENGINE ROOM MAIN WIRE |
| NG |
|
REPLACE INSTRUMENT PANEL WIRE |
|
|