Lexus NX: Curtain Shield Airbag Sensor (RH) (B1630,B1632,B1635,B1637)

Lexus NX Service Manual / Vehicle Interior / Supplemental Restraint Systems / Airbag System / Curtain Shield Airbag Sensor (RH) (B1630,B1632,B1635,B1637)

DESCRIPTION

The side airbag sensor assembly 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 B1630, B1632, B1635 or B1637 is stored when a malfunction is detected in the side airbag sensor assembly LH or RH circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1630

Curtain Shield Airbag Sensor (RH)

Either condition is met:

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

B1632

Curtain Shield Airbag Sensor Lost Communication (RH)

Either condition is met:

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

B1635

Curtain Shield Airbag Sensor (LH)

Either condition is met:

  • A side airbag sensor assembly LH malfunction.
  • An airbag ECU assembly malfunction.
  • Side airbag sensor assembly LH
  • Airbag ECU assembly

B1637

Curtain Shield Airbag Sensor Lost Communication (LH)

Either condition is met:

  • A side airbag sensor assembly LH malfunction.
  • An airbag ECU assembly malfunction.
  • 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 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 B1630, B1632, B1635 and B1637 may be output at this time, but they are not related to this check.

DTC B1630 or B1632 is output

GO TO STEP 3

DTC B1630, B1632, B1635 and B1637 are not output

USE SIMULATION METHOD TO CHECK

DTC B1635 or B1637 is output

2.

CHECK SIDE AIRBAG SENSOR ASSEMBLY LH

(a) Turn the power switch off.

*1

Side Airbag Sensor Assembly RH

*2

Airbag ECU Assembly

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

(c) Interchange the side airbag sensor assembly 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 B1630, B1632, B1635 and B1637 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 side airbag sensor assembly RH and LH to their original positions and connect the connectors to them.

DTC B1630 or B1632 is output

REPLACE SIDE AIRBAG SENSOR ASSEMBLY LH

DTC B1635 or B1637 is output

REPLACE AIRBAG ECU ASSEMBLY

DTC B1630, B1632, B1635 and B1637 are not output

USE SIMULATION METHOD TO CHECK

3.

CHECK SIDE AIRBAG SENSOR ASSEMBLY RH

(a) Turn the power switch off.

*1

Side Airbag Sensor Assembly LH

*2

Airbag ECU Assembly

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

(c) Interchange the side airbag sensor assembly 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 B1630, B1632, B1635 and B1637 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 side airbag sensor assembly LH and RH to their original positions and connect the connectors to them.

DTC B1635 or B1637 is output

REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH

DTC B1630 or B1632 is output

REPLACE AIRBAG ECU ASSEMBLY

DTC B1630, B1632, B1635 and B1637 are not output

USE SIMULATION METHOD TO CHECK

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