Toyota Venza manuals

Toyota Venza: Seat Position Airbag Sensor Circuit Malfunction (B1653/35)

Toyota Venza Service Manual / Supplemental Restraint Systems / Airbag System / Seat Position Airbag Sensor Circuit Malfunction (B1653/35)

DESCRIPTION

The seat position airbag sensor circuit consists of the center airbag sensor assembly and seat position airbag sensor.

DTC B1653/35 is stored when a malfunction is detected in the seat position airbag sensor circuit.

DTC No.

DTC Detection Condition

Trouble Area

B1653/35

  • 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 seat position airbag sensor circuit.
  • Front seat inner belt assembly LH malfunction
  • Seat position airbag sensor malfunction
  • Center airbag sensor assembly malfunction
  • Floor wire
  • Front seat inner belt assembly LH
  • Seat position airbag sensor
  • Center airbag sensor assembly

WIRING DIAGRAM


PROCEDURE

1.

CHECK 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 center airbag sensor assembly, front seat inner belt assembly LH and seat position airbag sensor.

OK:

The connectors are properly connected.

HINT:

If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

(d) Disconnect the connectors from the center airbag sensor assembly, front seat inner belt assembly LH and seat position airbag sensor.

(e) Check that the terminals of connectors are not damaged.

OK:

The terminals are not deformed or damaged.


NG

REPLACE WIRE HARNESS


OK

2.

CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (OPEN)

(a) Connect the connectors to the front seat inner belt assembly LH and floor wire.


(b) Using SST, connect terminals 9 (LSP+) and 17 (LSP-) of connector B.

NOTICE:

Do not forcibly insert SST into the terminals of the connector when connecting the wire.

SST: 09843-18040

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

2 (LSP+) - 1 (LSP-)

Always

Below 1 Ω

Text in Illustration

*1

Seat Position Airbag Sensor

*2

Center Airbag Sensor Assembly

*3

Front view of wire harness connector

(to Center Airbag Sensor Assembly)

*4

Front view of wire harness connector

(to Seat Position Airbag Sensor)

*5

Connector B

*6

Connector E


NG

GO TO STEP 9


OK

3.

CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT)

(a) Disconnect SST from connector B.


(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

2 (LSP+) - 1 (LSP-)

Always

1 MΩ or higher

Text in Illustration

*1

Seat Position Airbag Sensor

*2

Center Airbag Sensor Assembly

*3

Front view of wire harness connector

(to Seat Position Airbag Sensor)

*4

Connector E


NG

GO TO STEP 10


OK

4.

CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT TO B+)

(a) Connect the cable to the negative (-) battery terminal.


(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

2 (LSP+) - Body ground

Ignition switch ON

Below 1 V

1 (LSP-) - Body ground

Ignition switch ON

Below 1 V

Text in Illustration

*1

Seat Position Airbag Sensor

*2

Center Airbag Sensor Assembly

*3

Front view of wire harness connector

(to Seat Position Airbag Sensor)

*4

Connector E


NG

GO TO STEP 11


OK

5.

CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT TO GROUND)

(a) Turn the ignition switch off.


(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

2 (LSP+) - Body ground

Always

1 MΩ or higher

1 (LSP-) - Body ground

Always

1 MΩ or higher

Text in Illustration

*1

Seat Position Airbag Sensor

*2

Center Airbag Sensor Assembly

*3

Front view of wire harness connector

(to Seat Position Airbag Sensor)

*4

Connector E


NG

GO TO STEP 12


OK

6.

CHECK SEAT POSITION AIRBAG SENSOR

(a) Connect the connectors to the center airbag sensor assembly and seat position airbag sensor.


(b) Connect the cable to the negative (-) battery terminal.

(c) Turn the ignition switch to ON, and wait for at least 60 seconds.

(d) Clear the DTCs stored in memory (See page ).


(e) Turn the ignition switch off.

(f) Turn the ignition switch to ON, and wait for at least 60 seconds.

(g) Check for DTCs (See page ).


OK:

DTC B1653/35 is not output.

Text in Illustration

*1

Seat Position Airbag Sensor

*2

Center Airbag Sensor Assembly

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

7.

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 with a known good part (See page ).


HINT:

Perform the following inspection using known good parts from another vehicle if possible.


NEXT

8.

CHECK CENTER AIRBAG SENSOR ASSEMBLY

(a) Connect the cable to the negative (-) battery terminal.


(b) Turn the ignition switch to ON, and wait for at least 60 seconds.

(c) Clear the DTCs stored in memory (See page ).


(d) Turn the ignition switch off.

(e) Turn the ignition switch to ON, and wait for at least 60 seconds.

(f) Check for DTCs (See page ).


OK:

DTC B1653/35 is not output.

Text in Illustration

*1

Seat Position Airbag Sensor

*2

Center Airbag Sensor Assembly

HINT:

Codes other than DTC B1653/35 may be output at this time, but they are not related to this check.


OK

END


NG

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

9.

CHECK FLOOR WIRE (OPEN)

(a) Disconnect the floor wire from the front seat inner belt assembly LH.

HINT:

SST has already been inserted into connector B.


(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

L19-2 (LSP+) - L19-4 (LSP-)

Always

Below 1 Ω

Text in Illustration

*1

Seat Position Airbag Sensor

*2

Center Airbag Sensor Assembly

*3

Front Seat Inner Belt Assembly LH

*4

Floor Wire

*5

Front view of wire harness connector

(to Center Airbag Sensor Assembly)

*6

Front view of wire harness connector

(to Front Seat Inner Belt Assembly LH)

*7

Connector B

*8

Connector C


OK

REPLACE FRONT SEAT INNER BELT ASSEMBLY LH


NG

REPLACE FLOOR WIRE

10.

CHECK FLOOR WIRE (SHORT)

(a) Disconnect the floor wire from the front seat inner belt assembly LH.


(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

L19-2 (LSP+) - L19-4 (LSP-)

Always

1 MΩ or higher

Text in Illustration

*1

Seat Position Airbag Sensor

*2

Center Airbag Sensor Assembly

*3

Front Seat Inner Belt Assembly LH

*4

Floor Wire

*5

Front view of wire harness connector

(to Front Seat Inner Belt Assembly LH)

*6

Connector C


OK

REPLACE FRONT SEAT INNER BELT ASSEMBLY LH


NG

REPLACE FLOOR WIRE

11.

CHECK FLOOR WIRE (SHORT TO B+)

(a) Turn the ignition switch off.


(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(c) Disconnect the floor wire from the front seat inner belt assembly LH.

(d) Connect the cable to the negative (-) battery terminal.

(e) Turn the ignition switch to ON.

(f) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

L19-2 (LSP+) - Body ground

Ignition switch ON

Below 1 V

L19-4 (LSP-) - Body ground

Ignition switch ON

Below 1 V

Text in Illustration

*1

Seat Position Airbag Sensor

*2

Center Airbag Sensor Assembly

*3

Front Seat Inner Belt Assembly LH

*4

Floor Wire

*5

Front view of wire harness connector

(to Front Seat Inner Belt Assembly LH)

*6

Connector C


OK

REPLACE FRONT SEAT INNER BELT ASSEMBLY LH


NG

REPLACE FLOOR WIRE

12.

CHECK FLOOR WIRE (SHORT TO GROUND)

(a) Disconnect the floor wire from the front seat inner belt assembly LH.


(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

L19-2 (LSP+) - Body ground

Always

1 MΩ or higher

L19-4 (LSP-) - Body ground

Always

1 MΩ or higher

Text in Illustration

*1

Seat Position Airbag Sensor

*2

Center Airbag Sensor Assembly

*3

Front Seat Inner Belt Assembly LH

*4

Floor Wire

*5

Front view of wire harness connector

(to Front Seat Inner Belt Assembly LH)

*6

Connector C


OK

REPLACE FRONT SEAT INNER BELT ASSEMBLY LH


NG

REPLACE FLOOR WIRE

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