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Home >> Lexus >> 2020 >> LS 500 Base, AWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/ Vacuum Brake Booster) - Diagnostic Codes (2 Of 4) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/ Vacuum Brake Booster) >> DTC C1225: SM Solenoid Circuit; DTC C1468: SFR Solenoid Circuit; DTC C1469: SFL Solenoid Circuit; DTC C146A: SRR Solenoid Circuit; DTC C146B: SRL Solenoid Circuit [12/2017 - 09/2018] >> Description

DTC C1225: SM Solenoid Circuit; DTC C1468: SFR Solenoid Circuit; DTC C1469: SFL Solenoid Circuit; DTC C146A: SRR Solenoid Circuit; DTC C146B: SRL Solenoid Circuit [12/2017 - 09/2018]: Description

These DTCs are stored when a problem is determined in the skid control ECU (brake actuator assembly).

The brake actuator assembly solenoids turn on when signals are received from the skid control ECU (brake actuator assembly) and they control the pressure acting on the wheel cylinders to control the braking force.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
C1225 SM Solenoid Circuit Any of the following is detected:
  • While switching solenoid is on, overcurrent continues for 0.1 seconds or more.
  • While switching solenoid is off, an open circuit continues for 0.05 seconds or more.
  • While switching solenoid is on, an open circuit continues for 0.05 seconds or more.
  • While switching solenoid is off, current continues to be applied for 0.05 seconds or more.
  • A condition in which the outputs from switching solenoids are different continues for 0.2 seconds or more.
  • Solenoid circuit
  • Solenoid valve (brake actuator assembly)
 -
C1468 SFR Solenoid Circuit
  • Open or short circuit in decompression solenoid continues for 0.05 seconds or more.
  • While holding solenoid outputs OFF, open circuit continues for 0.05 seconds or more.
  • While holding solenoid outputs OFF, current is maintained for 0.05 seconds or more.
  • While holding solenoid outputs ON, overcurrent continues for 0.1 seconds or more.
  • While holding solenoid outputs ON, open circuit continues for 0.05 seconds or more.
  • Difference in holding solenoid LH and RH accuracy continues for 0.2 seconds or more.
  • Solenoid circuit
  • Solenoid valve (brake actuator assembly)
 -
C1469 SFL Solenoid Circuit
  • Open or short circuit in decompression solenoid continues for 0.05 seconds or more.
  • While holding solenoid outputs OFF, open circuit continues for 0.05 seconds or more.
  • While holding solenoid outputs OFF, current is maintained for 0.05 seconds or more.
  • While holding solenoid outputs ON, overcurrent continues for 0.1 seconds or more.
  • While holding solenoid outputs ON, open circuit continues for 0.05 seconds or more.
  • Difference in holding solenoid LH and RH accuracy continues for 0.2 seconds or more.
  • Solenoid circuit
  • Solenoid valve (brake actuator assembly)
 -
C146A SRR Solenoid Circuit
  • Open or short circuit in decompression solenoid continues for 0.05 seconds or more.
  • While holding solenoid outputs OFF, open circuit continues for 0.05 seconds or more.
  • While holding solenoid outputs OFF, current is maintained for 0.05 seconds or more.
  • While holding solenoid outputs ON, overcurrent continues for 0.1 seconds or more.
  • While holding solenoid outputs ON, open circuit continues for 0.05 seconds or more.
  • Difference in holding solenoid LH and RH accuracy continues for 0.2 seconds or more.
  • Solenoid circuit
  • Solenoid valve (brake actuator assembly)
 -
C146B SRL Solenoid Circuit
  • Open or short circuit in decompression solenoid continues for 0.05 seconds or more.
  • While holding solenoid outputs OFF, open circuit continues for 0.05 seconds or more.
  • While holding solenoid outputs OFF, current is maintained for 0.05 seconds or more.
  • While holding solenoid outputs ON, overcurrent continues for 0.1 seconds or more.
  • While holding solenoid outputs ON, open circuit continues for 0.05 seconds or more.
  • Difference in holding solenoid LH and RH accuracy continues for 0.2 seconds or more.
  • Solenoid circuit
  • Solenoid valve (brake actuator assembly)
 -
C1225 DTC DETECTION CONDITIONS

  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5
Diagnosis Condition - - - - - -
Malfunction Status While switching solenoid is on, overcurrent continues ◦ - - - -
While switching solenoid is off, an open circuit continues - ◦ - - -
While switching solenoid is on, an open circuit continues - - ◦ - -
While switching solenoid is off, current continues to be applied - - - ◦ -
A condition in which the outputs from switching solenoids are different continues - - - - ◦
Detection Time 0.1 seconds or more. 0.05 seconds or more. 0.05 seconds or more. 0.05 seconds or more. 0.2 seconds or more.
Number of Trips 1 trip 1 trip 1 trip 1 trip 1 trip

HINT: 

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

C1468 DTC DETECTION CONDITIONS

  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5 Pattern 6
Diagnosis Condition - - - - - - -
Malfunction Status Open or short circuit in decompression solenoid continues ◦ - - - - -
While holding solenoid outputs OFF, open circuit continues - ◦ - - - -
While holding solenoid outputs OFF, current is maintained - - ◦ - - -
While holding solenoid outputs ON, overcurrent continues - - - ◦ - -
While holding solenoid outputs ON, open circuit continues - - - - ◦ -
Difference in holding solenoid LH and RH accuracy continues - - - - - ◦
Detection Time 0.05 seconds or more. 0.05 seconds or more. 0.05 seconds or more. 0.1 seconds or more. 0.05 seconds or more. 0.2 seconds or more.
Number of Trips 1 trip 1 trip 1 trip 1 trip 1 trip 1 trip

HINT: 

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

C1469 DTC DETECTION CONDITIONS

  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5 Pattern 6
Diagnosis Condition - - - - - - -
Malfunction Status Open or short circuit in decompression solenoid continues ◦ - - - - -
While holding solenoid outputs OFF, open circuit continues - ◦ - - - -
While holding solenoid outputs OFF, current is maintained - - ◦ - - -
While holding solenoid outputs ON, overcurrent continues - - - ◦ - -
While holding solenoid outputs ON, open circuit continues - - - - ◦ -
Difference in holding solenoid LH and RH accuracy continues - - - - - ◦
Detection Time 0.05 seconds or more. 0.05 seconds or more. 0.05 seconds or more. 0.1 seconds or more. 0.05 seconds or more. 0.2 seconds or more.
Number of Trips 1 trip 1 trip 1 trip 1 trip 1 trip 1 trip

HINT: 

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

C146A DTC DETECTION CONDITIONS

  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5 Pattern 6
Diagnosis Condition - - - - - - -
Malfunction Status Open or short circuit in decompression solenoid continues ◦ - - - - -
While holding solenoid outputs OFF, open circuit continues - ◦ - - - -
While holding solenoid outputs OFF, current is maintained - - ◦ - - -
While holding solenoid outputs ON, overcurrent continues - - - ◦ - -
While holding solenoid outputs ON, open circuit continues - - - - ◦ -
Difference in holding solenoid LH and RH accuracy continues - - - - - ◦
Detection Time 0.05 seconds or more. 0.05 seconds or more. 0.05 seconds or more. 0.1 seconds or more. 0.05 seconds or more. 0.2 seconds or more.
Number of Trips 1 trip 1 trip 1 trip 1 trip 1 trip 1 trip

HINT: 

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

C146B DTC DETECTION CONDITIONS

  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5 Pattern 6
Diagnosis Condition - - - - - - -
Malfunction Status Open or short circuit in decompression solenoid continues ◦ - - - - -
While holding solenoid outputs OFF, open circuit continues - ◦ - - - -
While holding solenoid outputs OFF, current is maintained - - ◦ - - -
While holding solenoid outputs ON, overcurrent continues - - - ◦ - -
While holding solenoid outputs ON, open circuit continues - - - - ◦ -
Difference in holding solenoid LH and RH accuracy continues - - - - - ◦
Detection Time 0.05 seconds or more. 0.05 seconds or more. 0.05 seconds or more. 0.1 seconds or more. 0.05 seconds or more. 0.2 seconds or more.
Number of Trips 1 trip 1 trip 1 trip 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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