DTC Code | DTC Name |
---|---|
B1617/84 | Lost Communication with Front Airbag Sensor LH |
B1618/84 | Front Airbag Sensor LH Initialization Incomplete |
DESCRIPTION
The front airbag sensor LH circuit consists of the airbag ECU assembly and front airbag sensor LH.
The front airbag sensor LH detects impacts to the vehicle and sends signals to the airbag ECU assembly to determine if the airbag and pretensioner should be deployed.
These DTCs are stored when a malfunction is detected in the front airbag sensor LH circuit.
DTC No. | DTC Detection Condition | Trouble Area |
---|---|---|
B1617/84 B1618/84 |
|
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WIRING DIAGRAM
INSPECTION PROCEDURE
Note
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.
PROCEDURE
CHECK CONNECTORS
Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
Check that the connectors are properly connected to the airbag ECU assembly and front airbag sensor LH. Also check that the connectors that link the engine room main wire and instrument panel wire are properly connected.
OK |
---|
The connectors are properly connected. |
Tech Tips
If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.
Disconnect the connectors from the airbag ECU assembly and front airbag sensor LH. Also disconnect the connectors that link the engine room main wire and instrument panel wire.
Check that the terminals of the connectors are not damaged.
OK |
---|
The terminals are not deformed or damaged. |
NG |
REPLACE WIRE HARNESS |
OK |
CHECK FRONT AIRBAG SENSOR LH CIRCUIT (OPEN)
*1 | Front Airbag Sensor LH |
*2 | Airbag ECU Assembly |
*3 | Service Wire |
*a | Front view of wire harness connector (to Airbag ECU Assembly) |
*b | Front view of wire harness connector (to Front Airbag Sensor LH) |
Connect the connectors that link the engine room main wire and instrument panel wire.
Using a service wire, connect terminals 30 (+SL) and 28 (-SL) of connector B.
Note
Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
NG |
CHECK INSTRUMENT PANEL WIRE (OPEN) Click here |
OK |
CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT)
*1 | Front Airbag Sensor LH |
*2 | Airbag ECU Assembly |
*a | Front view of wire harness connector (to Front Airbag Sensor LH) |
Disconnect the service wire from connector B.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
NG |
CHECK INSTRUMENT PANEL WIRE (SHORT) Click here |
OK |
CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO B+)
*1 | Front Airbag Sensor LH |
*2 | Airbag ECU Assembly |
*a | Front view of wire harness connector (to Front Airbag Sensor LH) |
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).
Measure the voltage according to the value(s) in the table below.
Standard Voltage | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
NG |
CHECK INSTRUMENT PANEL WIRE (SHORT TO B+) Click here |
OK |
CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO GROUND)
*1 | Front Airbag Sensor LH |
*2 | Airbag ECU Assembly |
*a | Front view of wire harness connector (to Front Airbag Sensor LH) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
NG |
CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND) Click here |
OK |
CHECK FRONT AIRBAG SENSOR LH
*1 | Front Airbag Sensor RH |
*2 | Airbag ECU Assembly |
Connect the connector to the airbag ECU assembly.
Interchange the front airbag sensor LH with RH and connect the connectors.
Connect the cable to the negative (-) auxiliary battery terminal.
Clear the DTCs stored in memory Click here.
Turn the power switch off.
Turn the power switch on (IG), and wait for at least 60 seconds.
Check for DTCs Click here.
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
Tech Tips
Codes other than DTCs B1612/83, B1613/83, B1617/84 and B1618/84, may be output at this time, but they are not related to this check.
Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
Return the front airbag sensor LH and RH to their original positions and connect the connectors.
B |
REPLACE AIRBAG ECU ASSEMBLY Click here |
C |
REPLACE FRONT AIRBAG SENSOR LH Click here |
A |
USE SIMULATION METHOD TO CHECK Click here
CHECK INSTRUMENT PANEL WIRE (OPEN)
*1 | Front Airbag Sensor LH |
*2 | Airbag ECU Assembly |
*3 | Engine Room Main Wire |
*4 | Instrument Panel Wire |
*5 | Service Wire |
*a | Front view of wire harness connector (to Airbag ECU Assembly) |
*b | Front view of wire harness connector (to Engine Room Main Wire) |
Disconnect the instrument panel wire connector from the engine room main wire.
Tech Tips
The service wire has already been inserted into connector B.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Disconnect the service wire from connector B.
NG |
REPLACE INSTRUMENT PANEL WIRE |
OK |
REPLACE ENGINE ROOM MAIN WIRE
CHECK INSTRUMENT PANEL WIRE (SHORT)
*1 | Front Airbag Sensor LH |
*2 | Airbag ECU Assembly |
*3 | Engine Room Main Wire |
*4 | Instrument Panel Wire |
*a | Front view of wire harness connector (to Engine Room Main Wire) |
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 | ||||||
---|---|---|---|---|---|---|
|
NG |
REPLACE INSTRUMENT PANEL WIRE |
OK |
REPLACE ENGINE ROOM MAIN WIRE
CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)
*1 | Front Airbag Sensor LH |
*2 | Airbag ECU Assembly |
*3 | Engine Room Main Wire |
*4 | Instrument Panel Wire |
*a | Front view of wire harness connector (to Engine Room Main Wire) |
Disconnect the instrument panel wire connector from the engine room main wire.
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).
Measure the voltage according to the value(s) in the table below.
Standard Voltage | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
NG |
REPLACE INSTRUMENT PANEL WIRE |
OK |
REPLACE ENGINE ROOM MAIN WIRE
CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)
*1 | Front Airbag Sensor LH |
*2 | Airbag ECU Assembly |
*3 | Engine Room Main Wire |
*4 | Instrument Panel Wire |
*a | Front view of wire harness connector (to Engine Room Main Wire) |
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 | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
NG |
REPLACE INSTRUMENT PANEL WIRE |
OK |
REPLACE ENGINE ROOM MAIN WIRE