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Home >> Lexus >> 2019 >> LS 500 Base, AWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/O Vacuum Brake Booster) - Diagnostic Codes (2 Of 3) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster) >> DTC C1377: Capacitor Malfunction [12/2017 - 10/2023] >> Description

DTC C1377: Capacitor Malfunction [12/2017 - 10/2023]: Description

The brake control power supply with bracket assembly is used as auxiliary power for brake control when the battery voltage is low.

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1377 Capacitor Malfunction 101
102
103
105
106
108
109
110
  • INF Code: 101
    • Either of the following is detected:
      1. IG1 terminal voltage is 9.5 V or more, and malfunction signal (not brake control power supply with bracket assembly communication malfunction) reception condition continues for 3 seconds or more.
      2. Brake control power supply with bracket assembly is deteriorated (replacement necessary).
  • INF Code: 102
    • Either of the following is detected:
      1. IG1 terminal voltage is 9.5 V or more, and malfunction signal (not brake control power supply with bracket assembly communication malfunction) reception condition continues for 3 seconds or more.
      2. Self-discharge (current leak) is excessive (internal malfunction).
  • INF Code: 103
    • Either of the following is detected:
      1. IG1 terminal voltage is 9.5 V or more, and malfunction signal (not brake control power supply with bracket assembly communication malfunction) reception condition continues for 3 seconds or more.
      2. Overvoltage (16.4 V or more) continues to be applied from the battery to the brake control power supply with bracket assembly voltage input (+BC) for 10 seconds or more.
  • INF Code: 105
    • Either of the following is detected:
      1. IG1 terminal voltage is 9.5 V or more, and malfunction signal (not brake control power supply with bracket assembly communication malfunction) reception condition continues for 3 seconds or more.
      2. Circuit inside the power back up unit (charge) is malfunctioning.
  • INF Code: 106
    • Either of the following is detected:
      1. IG1 terminal voltage is 9.5 V or more, and malfunction signal (not brake control power supply with bracket assembly communication malfunction) reception condition continues for 3 seconds or more.
      2. Circuit inside the power back up unit (back up output circuit) is malfunctioning.
  • INF Code: 108
    • Either of the following is detected:
      1. IG1 terminal voltage is 9.5 V or more, and malfunction signal (not brake control power supply with bracket assembly communication malfunction) reception condition continues for 3 seconds or more.
      2. Circuit inside the power back up unit (voltage monitor circuit) is malfunctioning.
  • INF Code: 109
    • Either of the following is detected:
      1. IG1 terminal voltage is 9.5 V or more, and malfunction signal (not brake control power supply with bracket assembly communication malfunction) reception condition continues for 3 seconds or more.
      2. Open circuit between battery (12 V) and brake control power supply with bracket assembly power input (+BC terminal).
  • INF Code: 110
    • Either of the following is detected:
      1. IG1 terminal voltage is 9.5 V or more, and malfunction signal (not brake control power supply with bracket assembly communication malfunction) reception condition continues for 3 seconds or more.
      2. Open or short circuit between battery (12 V) and brake control power supply with bracket assembly output 1 (OUT1).
      3. Open or short circuit between battery (12 V) and brake control power supply with bracket assembly output 2 (OUT2).
  • INF Code: 101, 102, 105, 106, 108
    • Brake control power supply with bracket assembly
  • INF Code: 103
    • Apply high voltage
  • INF Code: 109
    • CAPACITOR fuse
    • Wire harness and connector
    • Improperly connected connector, deformation or corrosion of terminals
  • INF Code: 110
    • Wire harness and connector
    • Improperly connected connector, deformation or corrosion of terminals
 -
DTC DETECTION CONDITIONS: C1377 INF CODE: 101

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition IG1 terminal voltage is 9.5 V or more ◦ -
Malfunction Status A malfunction signal (not communication malfunction) is received from the brake control power supply with bracket assembly ◦ -
Brake control power supply with bracket assembly is deteriorated (replacement necessary). - ◦
Detection Time 3 seconds or more -
Number of Trips 1 trip 1 trip
DTC DETECTION CONDITIONS: C1377 INF CODE: 102

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition IG1 terminal voltage is 9.5 V or more ◦ -
Malfunction Status A malfunction signal (not communication malfunction) is received from the brake control power supply with bracket assembly ◦ -
Self-discharge (current leak) is excessive (internal malfunction). - ◦
Detection Time 3 seconds or more -
Number of Trips 1 trip 1 trip
DTC DETECTION CONDITIONS: C1377 INF CODE: 103

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition IG1 terminal voltage is 9.5 V or more ◦ -
Malfunction Status A malfunction signal (not communication malfunction) is received from the brake control power supply with bracket assembly ◦ -
Overvoltage (16.4 V or more) continues to be applied from the battery to the brake control power supply with bracket assembly voltage input (+BC) for 10 seconds or more. - ◦
Detection Time 3 seconds or more -
Number of Trips 1 trip 1 trip
DTC DETECTION CONDITIONS: C1377 INF CODE: 105

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition IG1 terminal voltage is 9.5 V or more ◦ -
Malfunction Status A malfunction signal (not communication malfunction) is received from the brake control power supply with bracket assembly ◦ -
Circuit inside the power back up unit (charge) is malfunctioning. - ◦
Detection Time 3 seconds or more -
Number of Trips 1 trip 1 trip
DTC DETECTION CONDITIONS: C1377 INF CODE: 106

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition IG1 terminal voltage is 9.5 V or more ◦ -
Malfunction Status A malfunction signal (not communication malfunction) is received from the brake control power supply with bracket assembly ◦ -
Circuit inside the power back up unit (back up output circuit) is malfunctioning. - ◦
Detection Time 3 seconds or more -
Number of Trips 1 trip 1 trip
DTC DETECTION CONDITIONS: C1377 INF CODE: 108

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition IG1 terminal voltage is 9.5 V or more ◦ -
Malfunction Status A malfunction signal (not communication malfunction) is received from the brake control power supply with bracket assembly ◦ -
Circuit inside the power back up unit (voltage monitor circuit) is malfunctioning. - ◦
Detection Time 3 seconds or more -
Number of Trips 1 trip 1 trip
DTC DETECTION CONDITIONS: C1377 INF CODE: 109

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition IG1 terminal voltage is 9.5 V or more ◦ -
Malfunction Status A malfunction signal (not communication malfunction) is received from the brake control power supply with bracket assembly ◦ -
Open circuit between battery (12 V) and brake control power supply with bracket assembly power input (+BC terminal). - ◦
Detection Time 3 seconds or more -
Number of Trips 1 trip 1 trip
DTC DETECTION CONDITIONS: C1377 INF CODE: 110

  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5
Diagnosis Condition IG1 terminal voltage is 9.5 V or more ◦ - - - -
Malfunction Status A malfunction signal (not communication malfunction) is received from the brake control power supply with bracket assembly ◦ - - - -
Open between battery (12 V) and brake control power supply with bracket assembly output 1 (OUT1) - ◦ - - -
Short circuit between battery (12 V) and brake control power supply with bracket assembly output 1 (OUT1) - - ◦ - -
Open between battery (12 V) and brake control power supply with bracket assembly output 2 (OUT2) - - - ◦ -
Short circuit between battery (12 V) and brake control power supply with bracket assembly output 2 (OUT2) - - - - ◦
Detection Time 3 seconds or more - - - -
Number of Trips 1 trip 1 trip 1 trip 1 trip 1 trip
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