Lexus NX: Side Airbag Sensor RH (B1690,B1695)

DESCRIPTION

The door side airbag sensor LH or RH consists of a lateral deceleration sensor, etc.

If the airbag ECU assembly receives signals from the lateral deceleration sensor, it determines whether the SRS should be activated.

DTC B1690 or B1695 is stored when a malfunction is detected in the door side airbag sensor LH or RH circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1690

Side Airbag Sensor RH

Either condition is met:

  • A door side airbag sensor RH malfunction.
  • An airbag ECU assembly malfunction.
  • Door side airbag sensor RH
  • Airbag ECU assembly

B1695

Side Airbag Sensor LH

Either condition is met:

  • A door side airbag sensor LH malfunction.
  • An airbag ECU assembly malfunction.
  • Door side airbag sensor 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 B1690 and B1695 may be output at this time, but they are not related to this check.

DTC B1695 is output

GO TO STEP 3

DTC B1690 and B1695 are not output

USE SIMULATION METHOD TO CHECK

DTC B1690 is output

2.

CHECK DOOR SIDE AIRBAG SENSOR RH

(a) Turn the power switch off.

*1

Door Side Airbag Sensor LH

*2

Side Airbag Sensor Assembly RH

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

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

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

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

(f) Clear the DTCs stored in memory.

Click here

Body Electrical > SRS Airbag > Clear DTCs

(g) Turn the power switch off.

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

(i) Check for DTCs.

Click here

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTC B1690 and B1695 may be output at this time, but they are not related to this check.

(j) Turn the power switch off.

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

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

DTC B1695 is output

REPLACE DOOR SIDE AIRBAG SENSOR RH

DTC B1690 is output

REPLACE AIRBAG ECU ASSEMBLY

DTC B1690 and B1695 are not output

USE SIMULATION METHOD TO CHECK

3.

CHECK DOOR SIDE AIRBAG SENSOR LH

(a) Turn the power switch off.

*1

Door Side Airbag Sensor RH

*2

Side Airbag Sensor Assembly LH

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

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

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

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

(f) Clear the DTCs stored in memory.

Click here

Body Electrical > SRS Airbag > Clear DTCs

(g) Turn the power switch off.

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

(i) Check for DTCs.

Click here

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTC B1690 and B1695 may be output at this time, but they are not related to this check.

(j) Turn the power switch off.

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

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

DTC B1690 is output

REPLACE DOOR SIDE AIRBAG SENSOR LH

DTC B1695 is output

REPLACE AIRBAG ECU ASSEMBLY

DTC B1690 and B1695 are not output

USE SIMULATION METHOD TO CHECK

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