Airbag System

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1653/35: Seat Position Airbag Sensor Circuit Malfunction

DTC B1653/35 - Seat Position Airbag Sensor Circuit Malfunction

DESCRIPTION

The seat position airbag sensor circuit consists of the center airbag sensor assembly and the seat position airbag sensor.
DTC B1653/35 is recorded when a malfunction is detected in the seat position airbag sensor circuit.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC

(a) Turn the engine switch on (IG), and wait for at least 60 seconds.
(b) Clear the DTCs stored in the memory DTC Check / Clear.
(c) Turn the engine switch off.
(d) Turn the engine switch on (IG), and wait for at least 60 seconds.
(e) Check the DTCs DTC Check / Clear.
OK:
DTC B1653/35 is not output.
HINT: Codes other than DTC B1653/35 may be output at this time, but they are not related to this check.

OK -- USE SIMULATION METHOD TO CHECK
NG -- Continue to next step.
2. CHECK CONNECTION OF CONNECTORS
(a) Turn the engine switch off.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Check that the connectors are properly connected to the center airbag sensor assembly and the seat position airbag sensor.
OK:
The connectors are properly connected.
NG -- CONNECT CONNECTORS PROPERLY, THEN GO TO STEP 1
OK -- Continue to next step.
3. CHECK CONNECTORS
(a) Disconnect the connectors from the center airbag sensor assembly and the seat position airbag sensor.
(b) Check that the connectors (on the center airbag sensor assembly side and seat position airbag sensor side) are not damaged.
OK:
The connectors are not deformed or damaged.
NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- Continue to next step.
4. CHECK VEHICLE CONDITION
(a) Check whether or not the vehicle is equipped with the rear side airbag.
Result:
A
with the rear side airbag
B
without the rear side airbag
B -- CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (OPEN)
A -- Continue to next step.
5. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (OPEN)

(a) Using a service wire, connect terminals 9 (DSP+) and 17 (DSP-) of connector B.
NOTE: Do not forcibly insert a service wire into the terminals of the connector when connecting the wire.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- CHECK FLOOR WIRE (OPEN)
OK -- Continue to next step.
6. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT)

(a) Disconnect the service wire from connector B.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- CHECK FLOOR WIRE (SHORT)
OK -- Continue to next step.
7. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT TO B+)

(a) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:

NG -- CHECK FLOOR WIRE (SHORT TO B+)
OK -- Continue to next step.
8. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT TO GROUND)

(a) Turn the engine switch off.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- CHECK FLOOR WIRE (SHORT TO GROUND)
OK -- Continue to next step.
9. CHECK SEAT POSITION AIRBAG SENSOR

(a) Connect the connectors to the center airbag sensor assembly and the seat position airbag sensor.
(b) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(c) Turn the engine switch on (IG), and wait for at least 60 seconds.
(d) Clear the DTCs stored in the memory DTC Check / Clear.
(e) Turn the engine switch off.
(f) Turn the engine switch on (IG), and wait for at least 60 seconds.
(g) Check the DTCs DTC Check / Clear.
OK:
DTC B1653/35 is not output.
HINT: Codes other than DTC B1653/35 may be output at this time, but they are not related to this check.

OK -- USE SIMULATION METHOD TO CHECK
NG -- Continue to next step.
10. REPLACE SEAT POSITION AIRBAG SENSOR
(a) Turn the engine switch off.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Replace the seat position airbag sensor Removal.
HINT: Perform inspection using parts from a normal vehicle if possible.

NEXT -- Continue to next step.
11. CHECK CENTER AIRBAG SENSOR ASSEMBLY

(a) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(b) Turn the engine switch on (IG), and wait for at least 60 seconds.
(c) Clear the DTCs stored in the memory DTC Check / Clear.
(d) Turn the engine switch off.
(e) Turn the engine switch on (IG), and wait for at least 60 seconds.
(f) Check the DTCs DTC Check / Clear.
OK:
DTC B1653/35 is not output.
HINT: Codes other than DTC B1653/35 may be output at this time, but they are not related to this check.

NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
OK -- END
12. CHECK FLOOR WIRE (OPEN)

(a) Disconnect the floor wire connector from the front seat inner belt assembly LH.
HINT: The service wire has already been inserted into connector B.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- REPLACE FRONT SEAT INNER BELT ASSEMBLY LH
13. CHECK FLOOR WIRE (SHORT)

(a) Disconnect the floor wire connector from the front seat inner belt assembly LH.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- REPLACE FRONT SEAT INNER BELT ASSEMBLY LH
14. CHECK FLOOR WIRE (SHORT TO B+)

(a) Turn the engine switch off.
(b) Disconnect the negative(-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Disconnect the floor wire connector from the front seat inner belt assembly LH.
(d) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(e) Turn the engine switch on (IG).
(f) Measure the voltage according to the value(s) in the table below.
Standard voltage:

NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- REPLACE FRONT SEAT INNER BELT ASSEMBLY LH
15. CHECK FLOOR WIRE (SHORT TO GROUND)

(a) Disconnect the floor wire connector from the front seat inner belt assembly LH.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- REPLACE FRONT SEAT INNER BELT ASSEMBLY LH
16. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (OPEN)

(a) Using a service wire, connect terminals 14 (DSP+) and 13 (DSP-) of connector B.
NOTE: Do not forcibly insert a service wire into the terminals of the connector when connecting the wire.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- CHECK FLOOR WIRE (OPEN)
OK -- Continue to next step.
17. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT)

(a) Disconnect the service wire from connector B.
(b) Measure the resistance between the terminals of connector E according to the value(s) in the table below.
Standard resistance:

NG -- CHECK FLOOR WIRE (SHORT)
OK -- Continue to next step.
18. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT TO B+)

NG -- CHECK FLOOR WIRE (SHORT TO B+)
OK -- Continue to next step.
19. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT TO GROUND)

NG -- CHECK FLOOR WIRE (SHORT TO GROUND)
OK -- Continue to next step.
20. CHECK SEAT POSITION AIRBAG SENSOR

(a) Connect the connectors to the center airbag sensor assembly and the seat position airbag sensor.
(b) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(c) Turn the engine switch on (IG), and wait for at least 60 seconds.
(d) Clear the DTCs stored in the memory DTC Check / Clear.
(e) Turn the engine switch off.
(f) Turn the engine switch on (IG), and wait for at least 60 seconds.
(g) Check the DTCs DTC Check / Clear.
OK:
DTC B1653/35 is not output.
HINT: Codes other than DTC B1653/35 may be output at this time, but they are not related to this check.

OK -- USE SIMULATION METHOD TO CHECK
NG -- Continue to next step.
21. REPLACE SEAT POSITION AIRBAG SENSOR
(a) Turn the engine switch off.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Replace the seat position airbag sensor Removal.
HINT: Perform inspection using parts from a normal vehicle if possible.

NEXT -- Continue to next step.
22. CHECK CENTER AIRBAG SENSOR ASSEMBLY

NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- REPLACE FRONT SEAT INNER BELT ASSEMBLY LH
24. CHECK FLOOR WIRE (SHORT)

(a) Disconnect the floor wire connector from the front seat inner belt assembly LH.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- REPLACE FRONT SEAT INNER BELT ASSEMBLY LH
25. CHECK FLOOR WIRE (SHORT TO B+)

NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- REPLACE FRONT SEAT INNER BELT ASSEMBLY LH
26. CHECK FLOOR WIRE (SHORT TO GROUND)

(a) Disconnect the floor wire connector from the front seat inner belt assembly LH.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- REPLACE FRONT SEAT INNER BELT ASSEMBLY LH