Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Curtain Shield Airbag Sensor (LH) (B1635,B1637)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Interior / Supplemental Restraint Systems / Airbag System / Curtain Shield Airbag Sensor (LH) (B1635,B1637)

DESCRIPTION

The side collision sensor LH circuit (bus 1) consists of the airbag sensor assembly, door side airbag sensor LH and rear airbag sensor LH.

The door side airbag sensor LH and rear airbag sensor LH detect impacts to the vehicle and send signals to the airbag sensor assembly to determine if the airbags and pretensioners should be deployed.

These DTCs are stored when a malfunction is detected in the rear airbag sensor LH.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Test Mode / Check Mode

B1635

Curtain Shield Airbag Sensor (LH)
  • Rear airbag sensor LH malfunction
  • Airbag sensor assembly malfunction
  • Rear airbag sensor LH
  • Airbag sensor assembly

Comes on

Does not apply to test/check mode

B1637

Curtain Shield Airbag Sensor Lost Communication (LH)
  • Rear airbag sensor LH malfunction
  • Airbag sensor assembly malfunction
  • Rear airbag sensor LH
  • Airbag sensor assembly

Comes on

Does not apply to test/check mode

WIRING DIAGRAM

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CAUTION / NOTICE / HINT

NOTICE:

After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

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PROCEDURE

1.

CHECK REAR AIRBAG SENSOR LH

(a) Turn the engine switch off.

*1

Rear Airbag Sensor RH

*2

Airbag Sensor Assembly

(b) Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(c) Interchange the rear airbag sensor LH with RH and connect the connectors.

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

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

(f) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(g) Turn the engine switch off.

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

(i) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTCs B1630, B1632, B1635 and B1637 may be output at this time, but they are not related to this check.

Result

Proceed to

DTC B1635 or B1637 is output.

A

DTC B1630 or B1632 is output.

B

DTCs B1630, B1632, B1635 and B1637 are not output.

C

(j) Turn the engine switch off.

(k) Disconnect the cable from the negative (-) battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

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

A

REPLACE AIRBAG SENSOR ASSEMBLY

B

REPLACE REAR AIRBAG SENSOR LH

C

USE SIMULATION METHOD TO CHECK

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