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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 C137B-A2: Brake System Control Module "A" System Voltage System Voltage Low [11/2023 - ] >> Typical Malfunction Thresholds

Typical Malfunction Thresholds

WARNING: This page is about a different variant/trim than selected.
C137C (CASE 1)

Either of the following conditions is met -
IGR voltage 10 V or less
IGP voltage 10 V or less
C137C (CASE 2)

All of the following conditions are met -
FR wheel speed sensor power voltage Less than 4.1 V
FL wheel speed sensor power voltage Less than 4.1 V
RR wheel speed sensor power voltage Less than 4.1 V
RL wheel speed sensor power voltage Less than 4.1 V
C137C (CASE 3)

Master cylinder pressure sensor data validity Invalid
C137C (CASE 4)

Stroke sensor data validity Invalid
C137C (CASE 5)

Wheel cylinder pressure sensor data validity Invalid
+BS voltage Less than 9.5 V
C137C (CASE 6)

Both of the following conditions are met -
Power supply for solenoid voltage Less than 6 V
+BS voltage Less than 9.5 V
C137C (CASE 7)

All of the following conditions are met -
History of blocking motor relay Off
Command to motor fail-safe relay On
Motor circuit current 264 A or more
+BS voltage Less than 9.5 V