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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System - Diagnostic Codes (6 Of 7) >> Airbag System >> DTC B1635: Curtain Shield Airbag Sensor (LH); DTC B1637: Curtain Shield Airbag Sensor Lost Communication (LH) [12/2019 - 11/2023] >> Description

DTC B1635: Curtain Shield Airbag Sensor (LH); DTC B1637: Curtain Shield Airbag Sensor Lost Communication (LH) [12/2019 - 11/2023]: Description

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

The side airbag sensor assembly 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