| Last Modified: 05-08-2025 | 6.11:8.1.0 | Doc ID: RM10000000214QI |
| Model Year Start: 2022 | Model: RAV4 | Prod Date Range: [12/2021 - ] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C137BA3; Brake System Control Module "A" System Voltage System Voltage High; 2022 - 2025 MY RAV4 RAV4 HV [12/2021 - ] | ||
|
DTC |
C137BA3 |
Brake System Control Module "A" System Voltage System Voltage High |
DESCRIPTION
If a malfunction is detected in the power supply circuit, the No. 2 skid control ECU (brake actuator assembly) stores this DTC and the fail-safe function prohibits operation of ABS, brake assist, regenerative brake cooperative control, etc.
This DTC is stored when the +BS terminal voltage deviates due to a malfunction in the power supply or charging circuit such as the auxiliary battery or DC/DC converter circuit, etc.
This DTC is cleared when the voltage at terminal +BS returns to normal.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Note |
|---|---|---|---|---|---|
|
C137BA3 |
Brake System Control Module "A" System Voltage System Voltage High |
The +BS terminal voltage is higher than 17.4 V for 0.8 seconds or more. |
|
Comes on |
|
MONITOR DESCRIPTION
When the voltage at terminal +BS of the No. 2 skid control ECU (brake actuator assembly) is more than a certain value, the No. 2 skid control ECU (brake actuator assembly) judges that the voltage is excessive, the MIL is illuminated and a DTC is stored.
MONITOR STRATEGY
|
Related DTCs |
C137D: Brake system voltage input out of range high |
|
Required Sensors/Components(Main) |
No. 2 skid control ECU (brake actuator assembly) |
|
Required Sensors/Components(Related) |
- |
|
Frequency of Operation |
Continuous |
|
Duration |
0.8 seconds |
|
MIL Operation |
Immediately |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
|
Monitor runs whenever the following DTCs are not stored |
None |
TYPICAL MALFUNCTION THRESHOLDS
|
+BS voltage |
Higher than 17.4 V |
COMPONENT OPERATING RANGE
|
+BS voltage |
17.4 V or less |
CONFIRMATION DRIVING PATTERN
NOTICE:
When performing the normal judgment procedure, make sure that the driver door is closed and is not opened at any time during the procedure.
HINT:
- After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
- When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
- Connect the GTS to the DLC3.
- Turn the ignition switch to ON and turn the GTS on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the ignition switch off.
- Turn the ignition switch to ON (READY) and turn the GTS on.
-
Wait for 2 seconds or more. [*]
HINT:
[*]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- Enter the following menus: Chassis / Brake/EPB / Utility / All Readiness.
-
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE, perform driving pattern again.
WIRING DIAGRAM
Refer to DTC C137BA2.
Click here
![2022 - 2025 MY RAV4 RAV4 HV [12/2021 - ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C137BA2; Brake System Control Module "A" System Voltage System Voltage Low](/t3Portal/stylegraphics/info.gif)
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
-
After replacing the No. 2 skid control ECU (brake actuator assembly), perform "Calibration" after performing "Reset Memory".
Click here
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (+BS 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 A105 No. 2 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 |
|---|---|---|
|
A105-14 (+BS) - Body ground |
Always |
11 to 14 V |
|
A105-14 (+BS) - A105-1 (GND1) |
Always |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
2. |
CLEAR DTC |
(a) Reconnect the A105 No. 2 skid control ECU (brake actuator assembly) connector.
(b) Clear the DTCs.
Chassis > Brake/EPB > Clear DTCs
(c) Turn the ignition switch off.
|
|
3. |
RECONFIRM DTC |
(a) Based on the Freeze Frame Data and interview with the customer, attempt to reproduce the conditions when the malfunction occurred.
(b) Check if the same DTC is output.
Chassis > Brake/EPB > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTC C137BA3 is not output. |
A |
|
DTC C137BA3 is output. |
B |
| A |
|
| B |
|
REPLACE BRAKE ACTUATOR ASSEMBLY
|
|
|