| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000002DYLP |
| Model Year Start: 2023 | Model: Corolla | Prod Date Range: [09/2022 - ] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): C125DA2,C125DA3; Electronic Brake Booster Control Module "A" Backup Power Supply Voltage System Voltage Low; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ] | ||
|
DTC |
C125DA2 |
Electronic Brake Booster Control Module "A" Backup Power Supply Voltage System Voltage Low |
|
DTC |
C125DA3 |
Electronic Brake Booster Control Module "A" Backup Power Supply Voltage System Voltage High |
DESCRIPTION
Refer to DTC C121F87.
Click here
![2023 - 2025 MY Corolla Corolla HV [09/2022 - ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): C121F87,...,C14CC1C; Electronic Brake Booster Control Module "A" Missing Message](/t3Portal/stylegraphics/info.gif)
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
DTC Output from |
Note |
|---|---|---|---|---|---|---|
|
C125DA2 |
Electronic Brake Booster Control Module "A" Backup Power Supply Voltage System Voltage Low |
Voltage from brake control power supply assembly is less than 2.8 V for 10 seconds. |
|
Does not come on |
Brake Booster |
Output ECU: Electric brake booster (brake booster with master cylinder assembly) |
|
C125DA3 |
Electronic Brake Booster Control Module "A" Backup Power Supply Voltage System Voltage High |
Brake control power supply assembly power source voltage is abnormal for 10 seconds or more. |
|
Does not come on |
Brake Booster |
Output ECU: Electric brake booster (brake booster with master cylinder assembly) |
WIRING DIAGRAM
Refer to DTC C121F87.
Click here
CAUTION / NOTICE / HINT
NOTICE:
These DTCs can causes fuses to burn out, so check and replace fuses as necessary after completing inspection and repairs.
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. |
|
(b) Disconnect the O197 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 |
|---|---|---|
|
O197-1 (+BC) - Body ground |
Always |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
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 O197 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 |
|---|---|---|
|
O197-4 (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 |
|
|
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 A157 electric brake booster (brake booster with master cylinder assembly) connector.
(c) Disconnect the O197 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 |
|---|---|---|
|
A157-1 (CBKP) - O197-6 (OUT) |
Always |
Below 1 Ω |
|
A157-1 (CBKP) or O197-6 (OUT) - Body ground and other terminals |
Always |
10 kΩ or higher |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|