DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK DTC
CHECK CONNECTION OF CONNECTORS
CHECK FRONT AIRBAG SENSOR LH CIRCUIT (OPEN)
CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT)
CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO B+)
CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO GROUND)
CHECK FRONT AIRBAG SENSOR LH
CHECK INSTRUMENT PANEL WIRE (OPEN)
CHECK INSTRUMENT PANEL WIRE (SHORT)
CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)
CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)
DTC B1615/14 Front Airbag Sensor LH Circuit Malfunction
DESCRIPTION
The front airbag sensor LH consists of the diagnostic circuit and the frontal deceleration sensor, etc.
If the center airbag sensor assembly receives signals from the frontal deceleration sensor, it determines whether or not the SRS should be activated.
DTC B1615/14 is recorded when a malfunction is detected in the front airbag sensor LH circuit.
| DTC No. | DTC Detecting Condition | Trouble Area |
| B1615/14 | 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
| Instrument panel wire
Engine room main wire
Front airbag sensor LH
Center airbag sensor assembly
|
WIRING DIAGRAM
INSPECTION PROCEDURE
Connect the connectors to the center airbag sensor assembly.
Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
Turn the engine switch on (IG), and wait for at least 60 seconds.
Clear the DTCs stored in the memory .
Turn the engine switch off.
Turn the engine switch on (IG), and wait for at least 60 seconds.
Check for DTCs .
- OK:
- DTC B1615/14 is not output.
- Codes other than DTC B1615/14 may be output at this time, but they are not related to this check.
| OK | |
| |
| USE SIMULATION METHOD TO CHECK |
|
| 2.CHECK CONNECTION OF CONNECTORS |
Turn the engine switch off.
Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
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.
| 4.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT) |
Disconnect the service wire from connector "B".
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester connection | Condition | Specified condition |
| A12-2 (+SL) - A12-1 (-SL) | Always | 1 MΩ or higher |
| 5.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO B+) |
Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
| Tester connection | Condition | Specified condition |
| A12-2 (+SL) - Body ground | Engine switch on (IG) | Below 1 V |
| A12-1 (-SL) - Body ground | Engine switch on (IG) | Below 1 V |
| 6.CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO GROUND) |
Turn the engine switch off.
Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester connection | Condition | Specified condition |
| A12-2 (+SL) - Body ground | Always | 1 MΩor higher |
| A12-1 (-SL) - Body ground | Always | 1 MΩor higher |
| 7.CHECK FRONT AIRBAG SENSOR LH |
Connect the connectors to the center airbag sensor assembly.
Interchange the front airbag sensor RH with LH and connect the connectors to them.
Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
Turn the engine switch on (IG), and wait for at least 60 seconds.
Clear the DTCs stored in the memory .
Turn the engine switch off.
Turn the engine switch on (IG), and wait for at least 60 seconds.
Check for DTCs .
- Result:
| Result | Proceed to |
| DTC B1615/14 is output. | A |
| DTC B1610/13 is output. | B |
| DTC B1610/13 and B1615/14 are not output. | C |
- Codes other than DTC B1610/13 and B1615/14 may be output at this time, but they are not related to this check.
| | REPLACE CENTER AIRBAG SENSOR ASSEMBLY |
|
|
| | REPLACE FRONT AIRBAG SENSOR LH |
|
|
| C | |
| |
| USE SIMULATION METHOD TO CHECK |
|
| 8.CHECK INSTRUMENT PANEL WIRE (OPEN) |
Disconnect the instrument panel wire connector from the engine room main wire.
- The service wire has already been inserted into connector "B".
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester connection | Condition | Specified condition |
| JA1-2 (+SL) - JA1-1 (-SL) | Always | Below 1 Ω |
| | REPAIR OR REPLACE INSTRUMENT PANEL WIRE |
|
|
| OK | |
| |
| REPAIR OR REPLACE ENGINE ROOM MAIN WIRE |
|
| 9.CHECK INSTRUMENT PANEL WIRE (SHORT) |
Disconnect the instrument panel wire connector from the engine room main wire.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester connection | Condition | Specified condition |
| JA1-2 (+SL) - JA1-1 (-SL) | Always | 1 MΩ or higher |
| | REPAIR OR REPLACE INSTRUMENT PANEL WIRE |
|
|
| OK | |
| |
| REPAIR OR REPLACE ENGINE ROOM MAIN WIRE |
|
| 10.CHECK INSTRUMENT PANEL WIRE (SHORT TO B+) |
Turn the engine switch off.
Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
Disconnect the instrument panel wire connector from the engine room main wire.
Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
| Tester connection | Condition | Specified condition |
| JA1-2 (+SL) - Body ground | Engine switch on (IG) | Below 1 V |
| JA1-1 (-SL) - Body ground | Engine switch on (IG) | Below 1 V |
| | REPAIR OR REPLACE INSTRUMENT PANEL WIRE |
|
|
| OK | |
| |
| REPAIR OR REPLACE ENGINE ROOM MAIN WIRE |
|
| 11.CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND) |
Disconnect the instrument panel wire connector from the engine room main wire.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester connection | Condition | Specified condition |
| JA1-2 (+SL) - Body ground | Always | 1 MΩ or higher |
| JA1-1 (-SL) - Body ground | Always | 1 MΩ or higher |
| | REPAIR OR REPLACE INSTRUMENT PANEL WIRE |
|
|
| OK | |
| |
| REPAIR OR REPLACE ENGINE ROOM MAIN WIRE |
|
LEXUS IS250, IS220d / GSE20 ALE20
