DESCRIPTION
The seat position airbag sensor circuit consists of the airbag sensor assembly
and seat position airbag sensor.
DTC B1653 is stored when a malfunction is detected in the seat position airbag
sensor circuit.
|
DTC No.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
Warning Indicate
|
Test Mode / Check Mode
|
|
B1653
|
Seat Position Airbag Sensor Circuit Malfunction
|
- 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 seat position airbag sensor circuit for 2 seconds.
- A seat position airbag sensor malfunction.
- An airbag sensor assembly malfunction
|
- Floor wire
- Front seat inner belt assembly LH
- Seat position airbag sensor
- 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 seat position airbag sensor.
OK:
Connectors are properly connected.
| NG |
 |
CONNECT CONNECTORS PROPERLY
|
| OK |
|
|
|
(a) Disconnect the connectors from the airbag sensor assembly and seat
position airbag sensor.
|
|
|
*1
|
Seat Position Airbag Sensor
|
|
*2
|
Airbag Sensor Assembly
|
|
*3
|
Front Seat Inner Belt Assembly LH
|
|
*4
|
Floor Wire
|
|
|
(b) Check that the connectors (on the airbag sensor assembly side and seat position
airbag sensor side) are not damaged.
OK:
Connectors are not deformed or damaged.
| NG |
|
REPLACE FLOOR WIRE OR FRONT SEAT INNER BELT ASSEMBLY LH
|
| OK |
|
|
|
|
3.
|
CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT
|
|
(a) Connect the cable to the negative (-) battery terminal, and wait
for at least 2 seconds.
|
|
|
*1
|
Seat Position Airbag Sensor
|
|
*2
|
Airbag Sensor Assembly
|
|
*3
|
Front Seat Inner Belt Assembly LH
|
|
*4
|
Floor Wire
|
|
*5
|
Service Wire
|
|
*a
|
Front view of wire harness connector
(to Seat Position Airbag Sensor)
|
|
*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
|
|
AA-1 (GND) - Body ground
|
Ignition switch ON
|
Below 1 V
|
|
AA-2 (VS) - 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 26 (LSP-) and 25 (LSP+) 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
|
|
AA-1 (GND) - AA-2 (VS)
|
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
|
|
AA-1 (GND) - AA-2 (VS)
|
Always
|
1 MΩ or higher
|
|
AA-1 (GND) - Body ground
|
Always
|
1 MΩ or higher
|
|
AA-2 (VS) - Body ground
|
Always
|
1 MΩ or higher
|
| NG |
|
GO TO STEP 7
|
| OK |
|
|
|
|
(a) Connect the connectors to the airbag sensor assembly and seat position
airbag sensor.
|
|
|
*1
|
Seat Position Airbag Sensor
|
|
*2
|
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.
Click here
(e) Turn the ignition switch off.
(f) Turn the ignition switch to ON, and wait for at least 60 seconds.
(g) Check for DTCs.
Click here
|
Result
|
Proceed to
|
|
DTC B1653 is not output
|
A
|
|
DTC B1653 is output
|
B
|
HINT:
Codes other than DTC B1653 may be output at this time, but they are not related
to this check.
| A |
|
USE SIMULATION METHOD TO CHECK
|
| B |
|
|
|
|
5.
|
REPLACE SEAT POSITION AIRBAG SENSOR
|
(a) Turn the ignition switch off.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for
at least 90 seconds.
(c) Replace the seat position airbag sensor.
Click here
HINT:
Perform the inspection using parts from a normal vehicle if possible.
| NEXT |
|
|
|
|
(a) Connect the cable to the negative (-) battery terminal, and wait
for at least 2 seconds.
|
|
|
|
*1
|
Seat Position Airbag Sensor
|
|
*2
|
Airbag Sensor Assembly
|
|
|
(b) Turn the ignition switch to ON, and wait for at least 60 seconds.
(c) Clear the DTCs.
Click here
(d) Turn the ignition switch off.
(e) Turn the ignition switch to ON, and wait for at least 60 seconds.
(f) Check for DTCs.
Click here
|
Result
|
Proceed to
|
|
DTC B1653 is not output
|
A
|
|
DTC B1653 is output
|
B
|
HINT:
Codes other than DTC B1653 may be output at this time, but they are not related
to this check.
| A |
|
END (SEAT POSITION AIRBAG SENSOR WAS DEFECTIVE)
|
| B |
|
REPLACE AIRBAG SENSOR ASSEMBLY
|
|
(a) Disconnect the floor wire connector from the front seat inner belt
assembly LH.
|
|
|
*1
|
Seat Position Airbag Sensor
|
|
*2
|
Airbag Sensor Assembly
|
|
*3
|
Front Seat Inner Belt Assembly LH
|
|
*4
|
Floor Wire
|
|
*5
|
Service Wire
|
|
*a
|
Front view of wire harness connector
(to Front Seat Inner Belt Assembly LH)
|
|
*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
|
|
P7-3 (LSP+) - Body ground
|
Ignition switch ON
|
Below 1 V
|
|
P7-4 (LSP-) - 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 26 (LSP-) and 25 (LSP+) 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
|
|
P7-3 (LSP+) - P7-4 (LSP-)
|
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
|
|
P7-3 (LSP+) - P7-4 (LSP-)
|
Always
|
1 MΩ or higher
|
|
P7-3 (LSP+) - Body ground
|
Always
|
1 MΩ or higher
|
|
P7-4 (LSP-) - Body ground
|
Always
|
1 MΩ or higher
|
| OK |
|
REPLACE FRONT SEAT INNER BELT ASSEMBLY LH
|
| NG |
|
REPLACE FLOOR WIRE
|
| 
