Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Brake System Control Module "A" System Voltage System Voltage High (C137BA3)

DESCRIPTION

If a malfunction is detected in the power supply circuit, the skid control ECU (brake actuator assembly) stores this DTC and the fail-safe function prohibits ABS operation.

This DTC is stored when the +BS terminal voltage deviates due to a malfunction in a power supply or charging system circuit such as the auxiliary battery or alternator circuit, etc.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C137BA3

Brake System Control Module "A" System Voltage System Voltage High

+BS terminal voltage is more than 16.5 V for 1 second or more.

  • Wire harness or connector
  • Skid control ECU (brake actuator assembly)

WIRING DIAGRAM

Refer to DTC C117A49

Click here

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before performing troubleshooting, make sure to confirm that the auxiliary battery voltage is normal.

    Click here

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the A151 skid control ECU (brake actuator assembly) connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A151-30 (+BS) - Body ground

Always

11 to 14 V

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    READ NEXT:

     Stop Lamp Relay Actuator Stuck On (C13807E)

    DESCRIPTION When any of the following conditions are met, the skid control ECU (brake actuator assembly) sets the drive output (STPO) ON which operates the stop light control relay (stop light sw

     Stop Lamp Relay Actuator Stuck Off (C13807F)

    DESCRIPTION Refer to DTC C13807E. Click here DTC No. Detection Item DTC Detection Condition Trouble Area C13807F Stop Lamp

     Brake Pressure Control Solenoid "A" Control Circuit Short to Battery (C13C012,...,C13C949)

    DESCRIPTION The ABS solenoid relay and master cylinder cut solenoid valves are built into the brake actuator assembly. Depending on the operating conditions, the master cylinder cut solenoid val

    SEE MORE:

     Random/Multiple Cylinder Misfire Detected (P030000,P030027,P030085-P030400)

    DESCRIPTION When the engine misfires, high concentrations of hydrocarbons (HC) enter the exhaust gas. Extremely high hydrocarbon concentration levels can cause an increase in exhaust emission levels. Extremely high concentrations of hydrocarbons can also cause increases in the three-way catalytic co

     ABS Operates Before Necessary When Braking

    DESCRIPTION Troubleshooting for when ABS operates too soon due to a noisy signal from the speed sensor, a difference in output, etc. PROCEDURE 1. PERFORM DEALER MODE (SIGNAL CHECK) INSPECTION (SPEED SENSOR CHECK) (a) Using the GTS, perform a Dealer Mode (Sig

    © 2020-2024 Copyright www.tcorollacross.com