Lexus ES: Brake System Malfunction (C13A9)
DESCRIPTION
The parking brake ECU (brake actuator assembly) receives the wheel speed signal of each wheel from the skid control ECU (brake booster with master cylinder assembly) via CAN communication.
This DTC is stored when a malfunction occurs in the skid control ECU (brake booster with master cylinder assembly).
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Memory | Note |
|---|---|---|---|---|---|
| C13A9 | Brake System Malfunction | Detection conditions (1)
Detection conditions (2)
Detection conditions (3)
|
| DTC stored | An electric parking brake system malfunction is displayed on the multi-information display. |
| Vehicle Condition | |||||
|---|---|---|---|---|---|
| Pattern 1 | Pattern 2 | Pattern 3 | Pattern 4 | ||
| Diagnosis Condition | Power switch on (IG) | ○ | ○ | ○ | - |
| Vehicle being driven and parking brake not engaged | - | - | - | ○ | |
| Malfunction Status | Abnormal signal received from all speed sensors from skid control ECU (brake booster with master cylinder assembly) | ○ | - | - | - |
| Brake system malfunctioning signal received from skid control ECU (brake booster with master cylinder assembly) | - | ○ | - | - | |
| When parking brake ECU (brake actuator assembly) not outputting parking brake operation request signal, there is parking brake operation signal from skid control ECU (brake booster with master cylinder assembly) | - | - | ○ | ○ | |
| Detection Time | Approximately 0.3 seconds | Approximately 0.3 seconds | Approximately 0.3 seconds | Approximately 0.3 seconds | |
| Number of Trips | 1 trip | 1 trip | 1 trip | 1 trip | |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
CAUTION / NOTICE / HINT
NOTICE:
The parking brake indicator light blinks (red) when the power switch is turned on (IG) after replacing the parking brake ECU (brake actuator assembly). Operate the electric parking brake switch assembly to turn off the parking brake indicator light (red).
PROCEDURE
| 1. | CHECK DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM) |
(a) Check for DTCs.
Chassis > ABS/VSC/TRC > Trouble Codes| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| DTCs are output | B |
| B | .gif) | GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM |
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|
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| 2. | CHECK DTC (ELECTRIC PARKING BRAKE SYSTEM) |
(a) Clear the DTCs.
Chassis > Electric Parking Brake > Clear DTCs(b) Turn the power switch off.
(c) Check for DTCs.
Chassis > Electric Parking Brake > Trouble Codes| Result | Proceed to |
|---|---|
| DTCs are output | A |
| DTCs are not output | B |
| A | | REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY) |
| B | | USE SIMULATION METHOD TO CHECK |
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Definition Of Terms
DEFINITION OF TERMS Term Definition Monitor Description Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and details). Related DTCs Group of diagnostic trouble codes that are output by the ECM based on the same malfunction detection logic.
Data List / Active Test
DATA LIST / ACTIVE TEST DATA LIST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. HINT: Using the Techstream to read the Data List allows the values or states of
