DESCRIPTION
The front airbag sensor LH circuit consists of the airbag sensor assembly and
front airbag sensor LH.
The front airbag sensor LH detects impacts to the vehicle and sends signals to
the airbag sensor assembly to determine if the airbag should be deployed.
DTC B1617 or B1618 is stored when a malfunction is detected in the front airbag
sensor LH circuit.
|
DTC No.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
Warning Indicate
|
Test Mode / Check Mode
|
|
B1617
|
Front Airbag Sensor Lost Communication (LH)
|
One of the following conditions is met:
- The airbag sensor assembly detects a line short circuit signal,
open circuit signal, short circuit to ground signal or short circuit
to B+ signal in the front airbag sensor LH circuit for 2 seconds.
- A front airbag sensor LH malfunction.
- An airbag sensor assembly malfunction.
|
- Instrument panel wire
- Engine room main wire
- Front airbag sensor LH
- Airbag sensor assembly
|
Comes on
|
Not applicable
|
|
B1618
|
Front Airbag Sensor Initialization Error (LH)
|
One of the following conditions is met:
- The airbag sensor assembly detects a line short circuit signal,
open circuit signal, short circuit to ground signal or short circuit
to B+ signal in the front airbag sensor LH circuit for 2 seconds.
- A front airbag sensor LH malfunction.
- An airbag sensor assembly malfunction.
|
- Instrument panel wire
- Engine room main wire
- Front airbag sensor LH
- Airbag sensor assembly
|
Comes on
|
Not applicable
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- After turning the ignition switch off, waiting time may be required before
disconnecting the cable from the negative (-) battery terminal. Therefore, make
sure to read the disconnecting the cable from the negative (-) battery terminal
notices before proceeding with work.
Click here 
- When disconnecting the cable from the negative (-) battery terminal while
performing repairs, some systems need to be initialized after the cable is reconnected.
Click here
PROCEDURE
|
1.
|
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 airbag sensor assembly
and front airbag sensor LH.
OK:
The connectors are properly connected.
| NG |
 |
CONNECT CONNECTORS PROPERLY
|
| OK |
|
|
(a) Disconnect the connectors from the airbag sensor assembly and front airbag
sensor LH.
|
(b) Check that the connectors (on the airbag sensor assembly side and
front airbag sensor LH side) are not damaged.
OK:
The connectors are not deformed or damaged.
|
|
|
*1
|
Front Airbag Sensor LH
|
|
*2
|
Airbag Sensor Assembly
|
|
*3
|
Engine Room Main Wire
|
|
*4
|
Instrument Panel Wire
|
|
|
| NG |
|
REPLACE INSTRUMENT PANEL WIRE OR ENGINE ROOM MAIN WIRE
|
| OK |
|
|
|
|
3.
|
CHECK FRONT AIRBAG SENSOR LH CIRCUIT
|
|
(a) Connect the cable to the negative (-) battery terminal, and wait
for at least 2 seconds.
|
|
|
*1
|
Front Airbag Sensor LH
|
|
*2
|
Airbag Sensor Assembly
|
|
*3
|
Engine Room Main Wire
|
|
*4
|
Instrument Panel Wire
|
|
*5
|
Service Wire
|
|
*a
|
Front view of wire harness connector
(to Front Airbag Sensor LH)
|
|
*b
|
Front view of wire harness connector
(to Airbag Sensor Assembly)
|
|
|
(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
|
|
A2-2 (+SL) - Body ground
|
Ignition switch ON
|
Below 1 V
|
|
A2-1 (-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 31 (-SL) of connector
B.
NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when
connecting a service wire.
(g) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection
|
Condition
|
Specified Condition
|
|
A2-2 (+SL) - A2-1 (-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
|
|
A2-2 (+SL) - A2-1 (-SL)
|
Always
|
1 MΩ or higher
|
|
A2-2 (+SL) - Body ground
|
Always
|
1 MΩ or higher
|
|
A2-1 (-SL) - Body ground
|
Always
|
1 MΩ or higher
|
| NG |
|
GO TO STEP 5
|
| OK |
|
|
|
|
4.
|
CHECK FRONT AIRBAG SENSOR LH
|
|
(a) Connect the connectors to the airbag sensor assembly.
|
|
|
*1
|
Front Airbag Sensor RH
|
|
*2
|
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 memory.
Click here
(f) Turn the ignition switch off.
(g) Turn the ignition switch to ON, and wait for at least 60 seconds.
(h) Check for DTCs.
Click here
|
Result
|
Proceed to
|
|
DTC B1617 or B1618 is output
|
A
|
|
DTC B1612 or B1613 is output
|
B
|
|
DTC B1612, B1613, B1617 and B1618 are not output
|
C
|
HINT:
Codes other than DTC B1612, B1613, B1617 and B1618 may be output at this time,
but they are not related to this check.
(i) Turn the ignition switch off.
(j) Disconnect the cable from the negative (-) battery terminal, and wait for
at least 90 seconds.
(k) Return the front airbag sensor RH and LH to their original positions and
connect the connectors to them.
| A |
|
REPLACE AIRBAG SENSOR ASSEMBLY
|
| B |
|
REPLACE FRONT AIRBAG SENSOR LH
|
| C |
|
USE SIMULATION METHOD TO CHECK
|
|
5.
|
CHECK INSTRUMENT PANEL WIRE
|
|
(a) Disconnect the instrument panel wire connector from the engine room
main wire.
|
|
|
*1
|
Front Airbag Sensor LH
|
|
*2
|
Airbag Sensor Assembly
|
|
*3
|
Engine Room Main Wire
|
|
*4
|
Instrument Panel Wire
|
|
*5
|
Service Wire
|
|
*a
|
Front view of wire harness connector
(to Engine Room Main Wire)
|
|
*b
|
Front view of wire harness connector
(to 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.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection
|
Switch Condition
|
Specified Condition
|
|
AJ8-2 (+SL) - Body ground
|
Ignition switch ON
|
Below 1 V
|
|
AJ8-1 (-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 31 (-SL) of connector
B.
NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when
connecting a service wire.
(h) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection
|
Condition
|
Specified Condition
|
|
AJ8-2 (+SL) - AJ8-1 (-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
|
|
AJ8-2 (+SL) - AJ8-1 (-SL)
|
Always
|
1 MΩ or higher
|
|
AJ8-2 (+SL) - Body ground
|
Always
|
1 MΩ or higher
|
|
AJ8-1 (-SL) - Body ground
|
Always
|
1 MΩ or higher
|
| OK |
|
REPLACE ENGINE ROOM MAIN WIRE
|
| NG |
|
REPLACE INSTRUMENT PANEL WIRE
|
| 
