Lexus NX: Lost Communication with Side Airbag Sensor RH (B1692,B1693,B1697,B1698)

Lexus NX Service Manual / Vehicle Interior / Supplemental Restraint Systems / Airbag System / Lost Communication with Side Airbag Sensor RH (B1692,B1693,B1697,B1698)

DESCRIPTION

The circuit for the side collision sensor LH or RH is composed of the airbag ECU assembly, side airbag sensor assembly LH or RH and door side airbag sensor LH or RH.

The side airbag sensor assembly LH or RH and door side airbag sensor LH or RH detect impacts to the vehicle and send signals to the airbag ECU assembly to determine if the airbag should be deployed.

DTC B1692, B1693, B1697 or B1698 is stored when a malfunction is detected in the circuit for the side collision sensor LH or RH.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1692

Lost Communication with Side Airbag Sensor RH

One of the following conditions is met:

  • The airbag ECU assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the circuit for the side collision sensor RH for 2 seconds.
  • A door side airbag sensor RH malfunction.
  • A side airbag sensor assembly RH malfunction.
  • An airbag ECU assembly malfunction.
  • Floor wire
  • Front door wire RH
  • Door side airbag sensor RH
  • Side airbag sensor assembly RH
  • Airbag ECU assembly

B1693

Side Airbag Sensor RH Initialization Incomplete

One of the following conditions is met:

  • The airbag ECU assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the circuit for the side collision sensor RH for 2 seconds.
  • A door side airbag sensor RH malfunction.
  • A side airbag sensor assembly RH malfunction.
  • An airbag ECU assembly malfunction.
  • Floor wire
  • Front door wire RH
  • Door side airbag sensor RH
  • Side airbag sensor assembly RH
  • Airbag ECU assembly

B1697

Lost Communication with Side Airbag Sensor LH

One of the following conditions is met:

  • The airbag ECU assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the circuit for the side collision sensor LH for 2 seconds.
  • A door side airbag sensor LH malfunction.
  • A side airbag sensor assembly LH malfunction.
  • An airbag ECU assembly malfunction.
  • No. 2 floor wire
  • Front door wire LH
  • Door side airbag sensor LH
  • Side airbag sensor assembly LH
  • Airbag ECU assembly

B1698

Side Airbag Sensor LH Initialization Incomplete

One of the following conditions is met:

  • The airbag ECU assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the circuit for the side collision sensor LH for 2 seconds.
  • A door side airbag sensor LH malfunction.
  • A side airbag sensor assembly LH malfunction.
  • An airbag ECU assembly malfunction.
  • No. 2 floor wire
  • Front door wire LH
  • Door side airbag sensor LH
  • Side airbag sensor assembly LH
  • Airbag ECU assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • After the power switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.

    Click here

  • When disconnecting and reconnecting the auxiliary battery

    Click here

    HINT:

    When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

    Click here

  • After replacing the airbag ECU assembly, refer to initialization.

    Click here

PROCEDURE

1.

CHECK DTC

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

(b) Clear the DTCs stored in memory.

Click here

Body Electrical > SRS Airbag > Clear DTCs

(c) Turn the power switch off.

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

(e) Check for DTCs.

Click here

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTC B1692, B1693, B1697 and B1698 may be output at this time, but they are not related to this check.

DTC B1692 or B1693 is output

GO TO STEP 8

DTC B1692, B1693, B1697 and B1698 are not output

USE SIMULATION METHOD TO CHECK

DTC B1697 or B1698 is output

2.

CHECK CONNECTION OF CONNECTORS

(a) Turn the power switch off.

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

(c) Check that the connectors are properly connected to the airbag ECU assembly, side airbag sensor assembly LH and door side airbag sensor LH.

The connectors are not properly connected

CONNECT CONNECTORS PROPERLY

The connectors are properly connected

3.

CHECK CONNECTORS

(a) Disconnect the connectors from the airbag ECU assembly, side airbag sensor assembly LH and door side airbag sensor LH.

(b) Check that the connectors (on the airbag ECU assembly side, side airbag sensor assembly LH side and door side airbag sensor LH side) are not damaged.

*1

Side Airbag Sensor Assembly LH

*2

Door Side Airbag Sensor LH

*3

Airbag ECU Assembly

*4

No. 2 Floor Wire

*5

Front Door Wire LH

The connectors are deformed or damaged

REPLACE FRONT DOOR WIRE LH OR NO. 2 FLOOR WIRE

The connectors are not deformed or damaged

4.

CHECK DOOR SIDE AIRBAG SENSOR LH CIRCUIT

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

*1

Door Side Airbag Sensor LH

*2

Side Airbag Sensor Assembly LH

*3

Connector E

*4

Connector B

*5

Service Wire

-

-

*a

Rear view of wire harness connector

(to Door Side Airbag Sensor LH)

*b

Front view of wire harness connector

(to Side Airbag Sensor Assembly LH)

(b) Turn the power switch on (IG).

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

Q7-1 (BDL+) - Body ground

Power switch on (IG)

Below 1 V

Q7-2 (BDL-) - Body ground

Power switch on (IG)

Below 1 V

(d) Turn the power switch off.

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

(f) Using a service wire, connect terminals 2 (BDL+) and 1 (BDL-) of connector E.

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

Q7-1 (BDL+) - Q7-2 (BDL-)

Always

Below 1 Ω

(h) Disconnect the service wire from connector E.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Q7-1 (BDL+) - Q7-2 (BDL-)

Always

1 MΩ or higher

Q7-1 (BDL+) - Body ground

Always

1 MΩ or higher

Q7-2 (BDL-) - Body ground

Always

1 MΩ or higher

NG

GO TO STEP 7

OK

5.

CHECK SIDE AIRBAG SENSOR ASSEMBLY LH

(a) Connect the connectors to the airbag ECU assembly and door side airbag sensor LH.

*1

Side Airbag Sensor Assembly RH

*2

Airbag ECU Assembly

(b) Interchange the side airbag sensor assembly LH with RH and connect the connectors to them.

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

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

(e) Clear the DTCs stored in memory.

Click here

Body Electrical > SRS Airbag > Clear DTCs

(f) Turn the power switch off.

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

(h) Check for DTCs.

Click here

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTC B1692, B1693, B1697 and B1698 may be output at this time, but they are not related to this check.

(i) Turn the power switch off.

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

(k) Return the side airbag sensor assembly RH and LH to their original positions and connect the connectors to them.

DTC B1692 or B1693 is output

REPLACE SIDE AIRBAG SENSOR ASSEMBLY LH

DTC B1692, B1693, B1697 and B1698 are not output

USE SIMULATION METHOD TO CHECK

DTC B1697 or B1698 is output

6.

CHECK DOOR SIDE AIRBAG SENSOR LH

(a) Interchange the door side airbag sensor LH with RH and connect the connectors to them.

*1

Door Side Airbag Sensor RH

*2

Side Airbag Sensor Assembly LH

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

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

(d) Clear the DTCs stored in memory.

Click here

Body Electrical > SRS Airbag > Clear DTCs

(e) Turn the power switch off.

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

(g) Check for DTCs.

Click here

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTC B1692, B1693, B1697 and B1698 may be output at this time, but they are not related to this check.

(h) Turn the power switch off.

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

(j) Return the door side airbag sensor RH and LH to their original positions and connect the connectors to them.

DTC B1692 or B1693 is output

REPLACE DOOR SIDE AIRBAG SENSOR LH

DTC B1697 or B1698 is output

REPLACE AIRBAG ECU ASSEMBLY

DTC B1692, B1693, B1697 and B1698 are not output

USE SIMULATION METHOD TO CHECK

7.

CHECK NO. 2 FLOOR WIRE

(a) Disconnect the No. 2 floor wire connector from the front door wire LH.

*1

Door Side Airbag Sensor LH

*2

Side Airbag Sensor Assembly LH

*3

Front Door Wire LH

*4

No. 2 Floor Wire

*5

Connector C

*6

Connector B

*7

Service Wire

-

-

*a

Front view of wire harness connector

(to Front Door Wire LH)

*b

Front view of wire harness connector

(to Side Airbag Sensor Assembly LH)

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

(c) Turn the power switch on (IG).

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

Q7-1 (BDL+) - Body ground

Power switch on (IG)

Below 1 V

Q7-2 (BDL-) - Body ground

Power switch on (IG)

Below 1 V

(e) Turn the power switch off.

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

(g) Using a service wire, connect terminals 1 (BDL+) and 2 (BDL-) of connector C.

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

Q7-1 (BDL+) - Q7-2 (BDL-)

Always

Below 1 Ω

(i) Disconnect the service wire from connector C.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Q7-1 (BDL+) - Q7-2 (BDL-)

Always

1 MΩ or higher

Q7-1 (BDL+) - Body ground

Always

1 MΩ or higher

Q7-2 (BDL-) - Body ground

Always

1 MΩ or higher

OK

REPLACE FRONT DOOR WIRE LH

NG

REPLACE NO. 2 FLOOR WIRE

8.

CHECK CONNECTION OF CONNECTORS

(a) Turn the power switch off.

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

(c) Check that the connectors are properly connected to the airbag ECU assembly, side airbag sensor assembly RH and door side airbag sensor RH.

The connectors are not properly connected

CONNECT CONNECTORS PROPERLY

The connectors are properly connected

9.

CHECK CONNECTORS

(a) Disconnect the connectors from the airbag ECU assembly, side airbag sensor assembly RH and door side airbag sensor RH.

(b) Check that the connectors (on the airbag ECU assembly side, side airbag sensor assembly RH side and door side airbag sensor RH side) are not damaged.

*1

Side Airbag Sensor Assembly RH

*2

Door Side Airbag Sensor RH

*3

Airbag ECU Assembly

*4

Floor Wire

*5

Front Door Wire RH

The connectors are deformed or damaged

REPLACE FRONT DOOR WIRE RH OR FLOOR WIRE

The connectors are not deformed or damaged

10.

CHECK DOOR SIDE AIRBAG SENSOR RH CIRCUIT

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

*1

Door Side Airbag Sensor RH

*2

Side Airbag Sensor Assembly RH

*3

Connector E

*4

Connector B

*5

Service Wire

-

-

*a

Rear view of wire harness connector

(to Door Side Airbag Sensor RH)

*b

Front view of wire harness connector

(to Side Airbag Sensor Assembly RH)

(b) Turn the power switch on (IG).

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

P7-1 (BDR+) - Body ground

Power switch on (IG)

Below 1 V

P7-2 (BDR-) - Body ground

Power switch on (IG)

Below 1 V

(d) Turn the power switch off.

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

(f) Using a service wire, connect terminals 2 (BDR+) and 1 (BDR-) of connector E.

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

P7-1 (BDR+) - P7-2 (BDR-)

Always

Below 1 Ω

(h) Disconnect the service wire from connector E.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

P7-1 (BDR+) - P7-2 (BDR-)

Always

1 MΩ or higher

P7-1 (BDR+) - Body ground

Always

1 MΩ or higher

P7-2 (BDR-) - Body ground

Always

1 MΩ or higher

NG

GO TO STEP 13

OK

11.

CHECK SIDE AIRBAG SENSOR ASSEMBLY RH

(a) Connect the connectors to the airbag ECU assembly and door side airbag sensor RH.

*1

Side Airbag Sensor Assembly LH

*2

Airbag ECU Assembly

(b) Interchange the side airbag sensor assembly RH with LH and connect the connectors to them.

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

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

(e) Clear the DTCs stored in memory.

Click here

Body Electrical > SRS Airbag > Clear DTCs

(f) Turn the power switch off.

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

(h) Check for DTCs.

Click here

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTC B1692, B1693, B1697 and B1698 may be output at this time, but they are not related to this check.

(i) Turn the power switch off.

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

(k) Return the side airbag sensor assembly LH and RH to their original positions and connect the connectors to them.

DTC B1697 or B1698 is output

REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH

DTC B1692, B1693, B1697 and B1698 are not output

USE SIMULATION METHOD TO CHECK

DTC B1692 or B1693 is output

12.

CHECK DOOR SIDE AIRBAG SENSOR RH

(a) Interchange the door side airbag sensor RH with LH and connect the connectors to them.

*1

Door Side Airbag Sensor LH

*2

Side Airbag Sensor Assembly RH

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

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

(d) Clear the DTCs stored in memory.

Click here

Body Electrical > SRS Airbag > Clear DTCs

(e) Turn the power switch off.

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

(g) Check for DTCs.

Click here

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTC B1692, B1693, B1697 and B1698 may be output at this time, but they are not related to this check.

(h) Turn the power switch off.

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

(j) Return the door side airbag sensor LH and RH to their original positions and connect the connectors to them.

DTC B1697 or B1698 is output

REPLACE DOOR SIDE AIRBAG SENSOR RH

DTC B1692 or B1693 is output

REPLACE AIRBAG ECU ASSEMBLY

DTC B1692, B1693, B1697 and B1698 are not output

USE SIMULATION METHOD TO CHECK

13.

CHECK FLOOR WIRE

(a) Disconnect the floor wire connector from the front door wire RH.

*1

Door Side Airbag Sensor RH

*2

Side Airbag Sensor Assembly RH

*3

Front Door Wire RH

*4

Floor Wire

*5

Connector C

*6

Connector B

*7

Service Wire

-

-

*a

Front view of wire harness connector

(to Front Door Wire RH)

*b

Front view of wire harness connector

(to Side Airbag Sensor Assembly RH)

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

(c) Turn the power switch on (IG).

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

P7-1 (BDR+) - Body ground

Power switch on (IG)

Below 1 V

P7-2 (BDR-) - Body ground

Power switch on (IG)

Below 1 V

(e) Turn the power switch off.

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

(g) Using a service wire, connect terminals 2 (BDR+) and 1 (BDR-) of connector C.

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

P7-1 (BDR+) - P7-2 (BDR-)

Always

Below 1 Ω

(i) Disconnect the service wire from connector C.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

P7-1 (BDR+) - P7-2 (BDR-)

Always

1 MΩ or higher

P7-1 (BDR+) - Body ground

Always

1 MΩ or higher

P7-2 (BDR-) - Body ground

Always

1 MΩ or higher

OK

REPLACE FRONT DOOR WIRE RH

NG

REPLACE FLOOR WIRE

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