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Home >> Toyota >> 2021 >> C-HR LE >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System - Diagnostic Codes (B1627-B1656) >> Airbag System >> DTC B1647: Side Satellite Sensor Bus Lost Communication (LH); DTC B1648: Side Satellite Sensor Bus Initialization Error (LH) [09/2019 - 12/2021] >> Description

DTC B1647: Side Satellite Sensor Bus Lost Communication (LH); DTC B1648: Side Satellite Sensor Bus Initialization Error (LH) [09/2019 - 12/2021]: Description

The side collision sensor LH circuit (bus 1) consists of the airbag sensor assembly, door side airbag sensor LH and No. 2 side airbag sensor LH.

The door side airbag sensor LH and No. 2 side 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 side collision sensor LH circuit (bus 1).

DTC No. Detection Item DTC Detection Condition Trouble Area Test Mode / Check Mode
B1647 Side Satellite Sensor Bus Lost Communication (LH)
  • The airbag sensor assembly detects a line short in the side collision sensor LH circuit (bus 1).
  • The airbag sensor assembly detects a short to ground in the side collision sensor LH circuit (bus 1).
  • The airbag sensor assembly detects a short to B+ in the side collision sensor LH circuit (bus 1).
  • The airbag sensor assembly detects an open in the side collision sensor LH circuit (bus 1).
  • No. 2 side airbag sensor LH malfunction
  • Door side airbag sensor LH malfunction
  • Airbag sensor assembly malfunction
  • Floor wire
  • Front door wire LH
  • No. 2 side airbag sensor LH
  • Door side airbag sensor LH
  • Airbag sensor assembly
 Does not apply to test/check mode
B1648 Side Satellite Sensor Bus Initialization Error (LH)
  • The airbag sensor assembly detects a line short in the side collision sensor LH circuit (bus 1).
  • The airbag sensor assembly detects a short to ground in the side collision sensor LH circuit (bus 1).
  • The airbag sensor assembly detects a short to B+ in the side collision sensor LH circuit (bus 1).
  • The airbag sensor assembly detects an open in the side collision sensor LH circuit (bus 1).
  • No. 2 side airbag sensor LH malfunction
  • Door side airbag sensor LH malfunction
  • Airbag sensor assembly malfunction
  • Floor wire
  • Front door wire LH
  • No. 2 side airbag sensor LH
  • Door side airbag sensor LH
  • Airbag sensor assembly
 Does not apply to test/check mode
DTC DETECTION CONDITIONS (B1647):

  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4
Diagnosis Condition Ignition switch ON ◦ ◦ ◦ ◦
Malfunction Status The airbag sensor assembly detects a line short in the side collision sensor LH circuit (bus 1) ◦ - - -
The airbag sensor assembly detects a short to ground in the side collision sensor LH circuit (bus 1) - ◦ - -
The airbag sensor assembly detects a short to B+ in the side collision sensor LH circuit (bus 1) - - ◦ -
The airbag sensor assembly detects an open in the side collision sensor LH circuit (bus 1) - - - ◦
Detection Time - - - -
Number of Trips 1 trip 1 trip 1 trip 1 trip
DTC DETECTION CONDITIONS (B1647):

  Vehicle Condition
Pattern 5 Pattern 6 Pattern 7
Diagnosis Condition Ignition switch ON ◦ ◦ ◦
Malfunction Status No. 2 side airbag sensor LH malfunction ◦ - -
Door side airbag sensor LH malfunction - ◦ -
Airbag sensor assembly malfunction - - ◦
Detection Time - - -
Number of Trips 1 trip 1 trip 1 trip
DTC DETECTION CONDITIONS (B1648):

  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4
Diagnosis Condition Ignition switch ON ◦ ◦ ◦ ◦
Malfunction Status The airbag sensor assembly detects a line short in the side collision sensor LH circuit (bus 1) ◦ - - -
The airbag sensor assembly detects a short to ground in the side collision sensor LH circuit (bus 1) - ◦ - -
The airbag sensor assembly detects a short to B+ in the side collision sensor LH circuit (bus 1) - - ◦ -
The airbag sensor assembly detects an open in the side collision sensor LH circuit (bus 1) - - - ◦
Detection Time - - - -
Number of Trips 1 trip 1 trip 1 trip 1 trip
DTC DETECTION CONDITIONS (B1648):

  Vehicle Condition
Pattern 5 Pattern 6 Pattern 7
Diagnosis Condition Ignition switch ON ◦ ◦ ◦
Malfunction Status No. 2 side airbag sensor LH malfunction ◦ - -
Door side airbag sensor LH malfunction - ◦ -
Airbag sensor assembly malfunction - - ◦
Detection Time - - -
Number of Trips 1 trip 1 trip 1 trip

HINT: 

DTC will be output when conditions for either of the patterns in the table above are met.

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