Dtc B1653/35 Seat Position Airbag Sensor Circuit Malfunction

Restraints. Lexus Is250, Is220D. Gse20 Ale20
Supplemental Restraint System. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC

CHECK CONNECTION OF CONNECTORS

CHECK FLOOR WIRE NO. 2 (OPEN)

CHECK FLOOR WIRE NO. 2 (SHORT)

CHECK FLOOR WIRE NO. 2 (SHORT TO B+)

CHECK FLOOR WIRE NO. 2 (SHORT TO GROUND)

CHECK SEAT POSITION AIRBAG SENSOR

REPLACE SEAT POSITION AIRBAG SENSOR

CHECK CENTER AIRBAG SENSOR ASSEMBLY

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.

DTC No.
DTC Detecting Condition
Trouble Area
B1653/35
  1. 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 for 2 seconds.
  2. Seat position airbag sensor malfunction
  3. Center airbag sensor assembly malfunction
  1. Floor wire No. 2
  2. Seat position airbag sensor
  3. Center airbag sensor assembly

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.Airbag System. Dtc B1653/35 Seat Position Airbag Sensor Circuit Malfunction


INSPECTION PROCEDURE

1.CHECK DTC


    Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.Airbag System. Dtc B1653/35 Seat Position Airbag Sensor Circuit Malfunction

  1. Turn the engine switch on (IG), and wait for at least 60 seconds.

  1. Clear the DTCs stored in the memory (Click here).

  1. Turn the engine switch off.

  1. Turn the engine switch on (IG), and wait for at least 60 seconds.

  1. Check for DTCs (Click here).

    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
Go to step 2
OK

USE SIMULATION METHOD TO CHECK

2.CHECK CONNECTION OF CONNECTORS

  1. Turn the engine switch off.

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

  1. 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, THEN GO TO STEP 1
OK


3.CHECK FLOOR WIRE NO. 2 (OPEN)


    Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.Airbag System. Dtc B1653/35 Seat Position Airbag Sensor Circuit Malfunction

  1. Disconnect the connectors from the center airbag sensor assembly and the seat position airbag sensor.

  1. Using a service wire, connect Q32-14 (DSP+) and Q32-13 (DSP-) of connector "B".

    NOTICE:
    Do not forcibly insert a service wire into the terminals of the connector when connecting.

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

    Standard resistance:
    LHD:
    Tester connection
    		Condition
    		Specified condition
    Q6-2 (LSP+) - Q6-4 (LSP-)
    		Always
    		Below 1 Ω
    RHD:
    Tester connection
    		Condition
    		Specified condition
    P4-2 (RSP+) - P4-4 (RSP-)
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE FLOOR WIRE NO. 2
OK


4.CHECK FLOOR WIRE NO. 2 (SHORT)


    Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.Airbag System. Dtc B1653/35 Seat Position Airbag Sensor Circuit Malfunction

  1. Disconnect the service wire from connector "B".

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

    Standard resistance:
    LHD:
    Tester connection
    		Condition
    		Specified condition
    Q6-2 (LSP+) - Q6-4 (LSP-)
    		Always
    		1 MΩ or higher
    RHD:
    Tester connection
    		Condition
    		Specified condition
    P4-2 (RSP+) - P4-4 (RSP-)
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE FLOOR WIRE NO. 2
OK


5.CHECK FLOOR WIRE NO. 2 (SHORT TO B+)


    Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.Airbag System. Dtc B1653/35 Seat Position Airbag Sensor Circuit Malfunction

  1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

  1. Turn the engine switch on (IG).

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

    Standard voltage:
    LHD:
    Tester connection
    		Condition
    		Specified condition
    Q6-2 (LSP+) - Body ground
    		Engine switch on (IG)
    		Below 1 V
    Q6-4 (LSP-) - Body ground
    		Engine switch on (IG)
    		Below 1 V
    RHD:
    Tester connection
    		Condition
    		Specified condition
    P4-2 (RSP+) - Body ground
    		Engine switch on (IG)
    		Below 1 V
    P4-4 (RSP-) - Body ground
    		Engine switch on (IG)
    		Below 1 V


NG
REPAIR OR REPLACE FLOOR WIRE NO. 2
OK


6.CHECK FLOOR WIRE NO. 2 (SHORT TO GROUND)


    Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.Airbag System. Dtc B1653/35 Seat Position Airbag Sensor Circuit Malfunction

  1. Turn the engine switch off.

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

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

    Standard resistance:
    LHD:
    Tester connection
    		Condition
    		Specified condition
    Q6-2 (LSP+) - Body ground
    		Always
    		1 MΩ or higher
    Q6-4 (LSP-) - Body ground
    		Always
    		1 MΩ or higher
    RHD:
    Tester connection
    		Condition
    		Specified condition
    P4-2 (RSP+) - Body ground
    		Always
    		1 MΩ or higher
    P4-4 (RSP-) - Body ground
    		Always
    		1 MΩ or higher


NG
REPAIR OR REPLACE FLOOR WIRE NO. 2
OK


7.CHECK SEAT POSITION AIRBAG SENSOR


    Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.Airbag System. Dtc B1653/35 Seat Position Airbag Sensor Circuit Malfunction

  1. Connect the connectors to the center airbag sensor assembly and the seat position airbag sensor.

  1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

  1. Turn the engine switch on (IG), and wait for at least 60 seconds.

  1. Clear the DTCs stored in the memory (Click here).

  1. Turn the engine switch off.

  1. Turn the engine switch on (IG), and wait for at least 60 seconds.

  1. Check for DTCs (Click here).

    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
Go to step 8
OK

USE SIMULATION METHOD TO CHECK

8.REPLACE SEAT POSITION AIRBAG SENSOR

  1. Turn the engine switch off.

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

  1. Replace the seat position airbag sensor (Click here).

    HINT:
    Perform inspection using parts from a normal vehicle if possible.

NEXT


9.CHECK CENTER AIRBAG SENSOR ASSEMBLY


    Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.Airbag System. Dtc B1653/35 Seat Position Airbag Sensor Circuit Malfunction

  1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

  1. Turn the engine switch on (IG), and wait for at least 60 seconds.

  1. Clear the DTCs stored in the memory (Click here).

  1. Turn the engine switch off.

  1. Turn the engine switch on (IG), and wait for at least 60 seconds.

  1. Check for DTCs (Click here).

    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