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Home >> Toyota >> 2021 >> 4Runner Limited, RWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System - Diagnostic Codes (B100-B1690) >> Airbag System >> DTC B1676-85: Lost Communication with Rear Floor Airbag Sensor RH; DTC B1677-85: Rear Floor Airbag Sensor RH Initialization Incomplete [08/2015 - 08/2019] >> Description

DTC B1676-85: Lost Communication with Rear Floor Airbag Sensor RH; DTC B1677-85: Rear Floor Airbag Sensor RH Initialization Incomplete [08/2015 - 08/2019]: Description

HINT: 

"Rear floor airbag sensor RH" refers to the rear floor side airbag sensor.

  1. The rear floor side airbag sensor circuit consists of the center airbag sensor and rear floor side airbag sensor.
  2. The rear floor side airbag sensor detects impacts to the vehicle and sends signals to the center airbag sensor to determine if the airbag should be deployed.
  3. DTC B1676-85 or B1677-85 is stored when a malfunction is detected in the rear floor side airbag sensor circuit.
DTC Code DTC Detection Condition Trouble Area
B1676-85 One of the following conditions is met:
  • The center airbag sensor detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the rear floor side airbag sensor circuit for 2 seconds.
  • A rear floor side airbag sensor malfunction.
  • A center airbag sensor malfunction.
  • Floor wire
  • Rear floor side airbag sensor
  • Center airbag sensor assembly
B1677-85 One of the following conditions is met:
  • The center airbag sensor detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the rear floor side airbag sensor circuit for 2 seconds.
  • A rear floor side airbag sensor malfunction.
  • A center airbag sensor malfunction.
  • Floor wire
  • Rear floor side airbag sensor
  • Center airbag sensor assembly