Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Electronic Brake Booster Control Module "A" Missing Message (C121F87,...,C14CC1C)

DESCRIPTION

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

Note

C121F87

Electronic Brake Booster Control Module "A" Missing Message

During IG ON, a brake control power supply assembly internal malfunction is detected.

  • Wire harness or connector
  • Brake control power supply assembly

Does not come on

Brake Booster

Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C136E17

Electronic Brake Booster Control Module "A" Backup Power Supply Voltage Circuit Voltage Above Threshold

During IG ON, a brake control power supply assembly cell malfunction is detected.

  • Wire harness or connector
  • Brake control power supply assembly

Does not come on

Brake Booster

Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C136E1E

Electronic Brake Booster Control Module "A" Backup Power Supply Voltage Circuit Resistance Out of Range

During IG ON, brake control power supply assembly degradation (end-of-life notification) is detected.

  • Wire harness or connector
  • Brake control power supply assembly

Does not come on

Brake Booster

Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C136E49

Electronic Brake Booster Control Module "A" Backup Power Supply Voltage Internal Electronic Failure

During IG ON, the brake control power supply assembly self-discharge amount (current leak) is detected to be excessive (internal malfunction).

  • Wire harness or connector
  • Brake control power supply assembly

Does not come on

Brake Booster

Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C137A04

Electronic Brake Booster Control Module "A" Backup Power Supply Module System Internal Failure

During IG ON, a brake control power supply assembly internal malfunction is detected.

  • Wire harness or connector
  • Brake control power supply assembly

Does not come on

Brake Booster

Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C137A17

Electronic Brake Booster Control Module "A" Backup Power Supply Module Circuit Voltage Above Threshold

During IG ON, a brake control power supply assembly overvoltage malfunction is detected.

  • Wire harness or connector
  • Brake control power supply assembly

Does not come on

Brake Booster

Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C137A49

Electronic Brake Booster Control Module "A" Backup Power Supply Module Internal Electronic Failure

During IG ON, a brake control power supply assembly power source circuit malfunction is detected.

  • Wire harness or connector
  • Brake control power supply assembly

Does not come on

Brake Booster

Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C137A86

Electronic Brake Booster Control Module "A" Backup Power Supply Module Signal (some circuit quantity, reported via serial data) Invalid

While driving at a vehicle speed of 3 km/h or more, LIN communication from brake control power supply assembly is abnormal for 10 seconds or more.

  • Wire harness or connector
  • Brake control power supply assembly

Does not come on

Brake Booster

Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C137A87

Electronic Brake Booster Control Module "A" Backup Power Supply Module Missing Message

LIN communication with brake control power supply assembly is abnormal for 0.5 seconds or more.

  • Wire harness or connector
  • Brake control power supply assembly

Does not come on

Brake Booster

Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C13BE00

Electronic Brake Booster Control Module "A" Backup Power Supply Module Charging Circuit

During IG ON, a brake control power supply assembly power source backup unit internal circuit (backup output circuit) failure is detected.

  • Wire harness or connector
  • Brake control power supply assembly

Does not come on

Brake Booster

Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C13BE49

Electronic Brake Booster Control Module "A" Backup Power Supply Module Charging Circuit Internal Electronic Failure

During IG ON, a brake control power supply assembly charging circuit malfunction is detected.

  • Wire harness or connector
  • Brake control power supply assembly

Does not come on

Brake Booster

Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C13DF1C

Electronic Brake Booster Control Module "A" Backup Power Supply Module Circuit Voltage Out of Range

During IG ON, a brake control power supply assembly power source malfunction is detected.

  • Wire harness or connector
  • Brake control power supply assembly

Does not come on

Brake Booster

Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C13FC49

Electronic Brake Booster Control Module "A" Internal Electronic Failure

LIN communication from brake control power supply assembly is abnormal for 0.1 seconds or more.

  • Wire harness or connector
  • Brake control power supply assembly

Does not come on

Brake Booster

Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C13FD12

Electronic Brake Booster Control Module "A" Backup Power Supply Module Discharge Circuit Circuit Short to Battery

During IG ON, a brake control power supply assembly discharging circuit malfunction is detected.

  • Wire harness or connector
  • Brake control power supply assembly

Does not come on

Brake Booster

Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C13FD14

Electronic Brake Booster Control Module "A" Backup Power Supply Module Discharge Circuit Circuit Short to Ground or Open

During IG ON, a brake control power supply assembly discharging circuit malfunction is detected.

  • Wire harness or connector
  • Brake control power supply assembly

Does not come on

Brake Booster

Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C148E1C

Electronic Brake Booster Control Module "A" Backup Power Supply Module Sensor Circuit Voltage Out of Range

During IG ON, a brake control power supply assembly internal circuit malfunction is detected.

  • Wire harness or connector
  • Brake control power supply assembly

Does not come on

Brake Booster

Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C14BF49

Electronic Brake Booster Control Module "A" Backup Power Supply Module Backup Circuit Internal Electronic Failure

During IG ON, a brake control power supply assembly backup circuit malfunction is detected.

  • Wire harness or connector
  • Brake control power supply assembly

Does not come on

Brake Booster

Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C14CC1C

Electronic Brake Booster Control Module "A" Backup Power Supply Module Temperature Sensor Circuit Voltage Out of Range

During IG ON, a brake control power supply assembly power source backup unit internal circuit (voltage monitor circuit) failure is detected.

  • Wire harness or connector
  • Brake control power supply assembly

Does not come on

Brake Booster

Output ECU: Electric brake booster (brake booster with master cylinder assembly)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (+BC TERMINAL)

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

OK:

The connector is securely connected.

*a

Front view of wire harness connector

(to Brake Control Power Supply Assembly)

(b) Disconnect the O223 brake control power supply 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

O223-1 (+BC) - Body ground

Always

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

CHECK HARNESS AND CONNECTOR (GND TERMINAL)

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

OK:

The connector is securely connected.

(b) Disconnect the O223 brake control power supply assembly connector.

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

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O223-4 (GND) - Body ground

1 minute or more after disconnecting the cable from the negative (-) auxiliary battery terminal

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - BRAKE CONTROL POWER SUPPLY ASSEMBLY)

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

OK:

The connector is securely connected.

(b) Disconnect the A189 electric brake booster (brake booster with master cylinder assembly) connector.

(c) Disconnect the O223 brake control power supply assembly connector.

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

OK:

No deformation or corrosion.

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A189-21 (CLIN) - O223-2 (LIN)

Always

Below 1 Ω

A189-21 (CLIN) or O223-2 (LIN) - Body ground and other terminals

Always

10 kΩ or higher

A189-1 (CBKP) - O223-6 (OUT)

Always

Below 1 Ω

A189-1 (CBKP) or O223-6 (OUT) - Body ground and other terminals

Always

10 kΩ or higher

A189-8 (CWKP) - O223-3 (WKUP)

Always

Below 1 Ω

A189-8 (CWKP) or O223-3 (WKUP) - Body ground and other terminals

Always

10 kΩ or higher

OK

REPLACE BRAKE CONTROL POWER SUPPLY ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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