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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 135 (Electronically Controlled Brake System (HV) - Diagnostic Codes (09 Of 11)) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model) >> DTC C141C-12: Brake Booster Motor "A" Control Circuit Short to Battery; DTC C141C-14: Brake Booster Motor "A" Control Circuit Short to Ground or Open; DTC C141C-1C: Brake Booster Motor "A" Control Circuit Voltage Out of Range [11/2023 - ] >> Typical Enabling Conditions

Typical Enabling Conditions

WARNING: This page is about a different variant/trim than selected.
C140F (CASE 1)

Monitor runs whenever the following DTCs are not stored C110F: Brake system voltage circuit low
C141C (Case 1): Brake booster motor relay output shorted high
C141C (Case 2): Brake booster motor freewheeling MOS output shorted high
C141C (Case 3 to 10): Brake booster motor gate voltage output functional
C141D: Brake booster motor open circuit
C141E: Brake booster motor circuit high
C14C7 (Case 3 to 9): Brake system voltage circuit low
C14C8: Brake system voltage circuit high
All of the following conditions are met A, B and C
A. Brake system voltage 1 Less than 23.2 V and higher than 7.3 V
B. Following conditions are met 4 seconds or more
Both of the following conditions are met -
Motor duty output order value 0%
Motor fail-safe relay monitor On
C. Motor fail judgment permission in current trip On
C140F (CASE 2)

Monitor runs whenever the following DTCs are not stored C110F: Brake system voltage circuit low
C141C (Case 1): Brake booster motor relay output shorted high
C141C (Case 2): Brake booster motor freewheeling MOS output shorted high
C141C (Case 3 to 10): Brake booster motor gate voltage output functional
C141D: Brake booster motor open circuit
C141E: Brake booster motor circuit high
C14C7 (Case 3 to 9): Brake system voltage circuit low
C14C8: Brake system voltage circuit high
All of the following conditions are met -
Brake system voltage 1 Less than 23.2 V and higher than 7.3 V
MRI1 voltage 5.7 V or more
Motor relay input signal permission Off
Command to motor relay Off
Motor duty output order value 0%
Command to reverse battery protection MOS Off
Command to motor fail-safe relay On
C140F (CASE 3)

Monitor runs whenever the following DTCs are not stored C110F: Brake system voltage circuit low
C141C (Case 1): Brake booster motor relay output shorted high
C141C (Case 2): Brake booster motor freewheeling MOS output shorted high
C141C (Case 3 to 10): Brake booster motor gate voltage output functional
C141D: Brake booster motor open circuit
C141E: Brake booster motor circuit high
C14C7 (Case 3 to 9): Brake system voltage circuit low
C14C8: Brake system voltage circuit high
All of the following conditions are met -
Brake system voltage 1 Less than 23.2 V and higher than 7.3 V
MRI1 voltage 5.7 V or more
Motor relay input signal permission Off
Command to motor relay Off
Motor duty output order value 0%
Command to reverse battery protection MOS On
Command to motor fail-safe relay Off
C141D (CASE 1)

Monitor runs whenever the following DTCs are not stored C110F: Brake system voltage circuit low
C140F: Brake booster motor circuit open
C141C (Case 1): Brake booster motor relay output shorted high
C141C (Case 2): Brake booster motor freewheeling MOS output shorted high
C141C (Case 3 to 10): Brake booster motor gate voltage output functional
C141E: Brake booster motor circuit high
C14C7 (Case 3 to 9): Brake system voltage circuit low
C14C8: Brake system voltage circuit high
C14CA: Brake system voltage open circuit
All of the following conditions are met -
Brake system voltage 1 Less than 23.2 V and higher than 7.3 V
Motor fail-safe relay output monitor On
Output duty order value (command to motor relay port) 100%
Motor fail judgment permission in current trip On
C141D (CASE 2)

Monitor runs whenever the following DTCs are not stored C110F: Brake system voltage circuit low
C140F: Brake booster motor circuit open
C141C (Case 1): Brake booster motor relay output shorted high
C141C (Case 2): Brake booster motor freewheeling MOS output shorted high
C141C (Case 3 to 10): Brake booster motor gate voltage output functional
C141E: Brake booster motor circuit high
C14C7 (Case 3 to 9): Brake system voltage circuit low
C14C8: Brake system voltage circuit high
C14CA: Brake system voltage open circuit
All of the following conditions are met -
Brake system voltage 1 Less than 23.2 V and higher than 7.3 V
MRI1 voltage 5.7 V or more
Motor relay input signal permission On
Command to motor relay On
Motor duty output order value 100%
Command to reverse battery protection MOS Off
Command to motor fail-safe relay Off
C141E (CASE 1)

Monitor runs whenever the following DTCs are not stored C110F: Brake system voltage circuit low
C140F: Brake booster motor circuit open
C141C (Case 1): Brake booster motor relay output shorted high
C141C (Case 2): Brake booster motor freewheeling MOS output shorted high
C141C (Case 3 to 10): Brake booster motor gate voltage output functional
C141D: Brake booster motor open circuit
C14C7 (Case 3 to 9): Brake system voltage circuit low
C14C8: Brake system voltage circuit high
All of the following conditions are met A, B and C
A. Brake system voltage 1 Less than 23.2 V and higher than 7.3 V
B. Following conditions are met 4 seconds or more
Both of the following conditions are met -
Motor duty output order value 0%
Motor fail-safe relay monitor On
C. Motor fail judgment permission in current trip On
C141E (CASE 2)

Monitor runs whenever the following DTCs are not stored C110F: Brake system voltage circuit low
C140F: Brake booster motor circuit open
C141C (Case 1): Brake booster motor relay output shorted high
C141C (Case 2): Brake booster motor freewheeling MOS output shorted high
C141C (Case 3 to 10): Brake booster motor gate voltage output functional
C141D: Brake booster motor open circuit
C14C7 (Case 3 to 9): Brake system voltage circuit low
C14C8: Brake system voltage circuit high
All of the following conditions are met -
Brake system voltage 1 Less than 23.2 V
MRI1 voltage 5.7 V or more
Motor relay input signal permission Off
Command to motor relay On
Motor duty output order value 100%
Command to reverse battery protection MOS Off
Command to motor fail-safe relay Off
C141E (CASE 3)

Monitor runs whenever the following DTCs are not stored C110F: Brake system voltage circuit low
C140F: Brake booster motor circuit open
C141C (Case 1): Brake booster motor relay output shorted high
C141C (Case 2): Brake booster motor freewheeling MOS output shorted high
C141C (Case 3 to 10): Brake booster motor gate voltage output functional
C141D: Brake booster motor open circuit
C14C7 (Case 3 to 9): Brake system voltage circuit low
C14C8: Brake system voltage circuit high
All of the following conditions are met -
Brake system voltage 1 Less than 23.2 V
MRI1 voltage 5.7 V or more
Motor relay input signal permission Off
Command to motor relay Off
Motor duty output order value 0%
Command to reverse battery protection MOS Off
Command to motor fail-safe relay Off
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