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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 37 (Electronically Controlled Brake System (HV) - Diagnostic Codes (08 Of 11)) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model) >> DTC C12F8-12: ECB Solenoid Control "A" Circuit Short to Battery; DTC C12F8-14: ECB Solenoid Control "A" Circuit Short to Ground or Open [12/2019 - 11/2023] >> Component Operating Range

Component Operating Range

WARNING: This page is about a different variant/trim than selected.
C12FA (CASE 1 AND 2) AND C12FB (CASE 1)

Both of the following conditions are met A and B
A. All of the following conditions are met at the ECU status (last IG ON timing final) -
Brake system voltage fail (C12FA, C12FB) Not detected
Brake booster motor fail (C141C, C141D, C141E, C141F) Not detected
Brake pressure control solenoid fail (C14F4, C14FD, C150A, C1510) Not detected
B. All of the following conditions are met at the ECU status (pre main) -
Brake system voltage fail (C121F, C12FA, C12FB) Not detected
Brake booster motor fail (C141C) Not detected
Brake pressure control solenoid fail (C14F3, C14F4, C14FC, C14FD, C1509, C150A, C150F, C1510) Not detected
C12FA (CASE 3)

All of the following conditions are met A, B, C and D
A. Solenoid relay On
B. Brake system voltage 1 Higher than 7.3 V
C. All of the following conditions are met at the ECU status (last IG ON timing final) -
Brake system voltage fail (C12FA, C12FB) Not detected
Brake booster motor fail (C141C, C141D, C141E, C141F) Not detected
Brake pressure control solenoid fail (C14F4, C14FD, C150A, C1510) Not detected
D. All of the following conditions are met at the ECU status (pre main) -
Brake system voltage fail (C121F, C12FA, C12FB) Not detected
Brake booster motor fail (C141C) Not detected
Brake pressure control solenoid fail (C14F3, C14F4, C14FC, C14FD, C1509, C150A, C150F, C1510) Not detected
C12FB (CASE 2)

All of the following conditions are met A, B and C
A. Solenoid relay Off
B. All of the following conditions are met at the ECU status (last IG ON timing final) -
Brake system voltage fail (C12FA, C12FB) Not detected
Brake booster motor fail (C141C, C141D, C141E, C141F) Not detected
Brake pressure control solenoid fail (C14F4, C14FD, C150A, C1510) Not detected
C. All of the following conditions are met at the ECU status (pre main) -
Brake system voltage fail (C121F, C12FA, C12FB) Not detected
Brake booster motor fail (C141C) Not detected
Brake pressure control solenoid fail (C14F3, C14F4, C14FC, C14FD, C1509, C150A, C150F, C1510) Not detected