Lexus ES: Electric Parking Brake System AUTO Function Circuit
DESCRIPTION
The skid control ECU (brake actuator assembly) receives shift position signals from the ECM via CAN communication to control the electric parking brake system AUTO function (IG-OFF linked function).
The electric parking brake system AUTO function (IG-OFF linked function) is automatically disabled when the engine switch is on (IG), the brake pedal is depressed and the shift lever is moved out of P. Then, if the shift lever is moved to P, the AUTO function (IG-OFF linked function) automatically operates to apply the electric parking brake.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- The AUTO function (IG-OFF linked function) will not be automatically disabled when the engine switch is on (IG), the brake pedal is depressed and the shift lever is moved out from P if the electric parking brake switch assembly is moved to the engage side. The AUTO function (IG-OFF linked function) will not automatically operate to apply the electric parking brake when the shift lever is moved to P if the electric parking brake switch assembly is moved to the release side.
- The electric parking brake may still operate up to 20 seconds after the engine switch is turned off. Before disconnecting connectors or fuses, turn the engine switch off and wait 20 seconds or more.
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After replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and store system information memorization.
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- When replacing the skid control ECU (brake actuator assembly), operate the electric parking brake switch assembly as the parking brake indicator light blinks (red) when the engine switch is first turned on (IG).
PROCEDURE
| 1. | CHECK DTC (SFI SYSTEM) |
(a) Check for DTCs.
Powertrain > Engine > Trouble Codes| Result | Proceed to |
|---|---|
| DTC is not output | A |
| DTC is output | B |
| A | .gif) | REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) |
| B | | GO TO SFI SYSTEM |
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Electric Parking Brake System AUTO Function Circuit
DESCRIPTION The skid control ECU (brake actuator assembly) receives shift position signals from the ECM via CAN communication to control the electric parking brake system AUTO function (IG-OFF linked
Fail-safe Chart
FAIL-SAFE CHART DTC Trouble Area Parking Brake Indicator Light (Red) Brake System Warning Light (Yellow) Fail-safe Deactivation Condition C059704 Skid control ECU (brake actuator asse
Freeze Frame Data
FREEZE FRAME DATA FREEZE FRAME DATA HINT:
When a DTC is stored, the freeze frame data stores the current vehicle (sensor) state as.
The freeze frame data cannot be cleared or updated until the re
SEE MORE:
Driving the vehicle
The following procedures should be
observed to ensure safe driving:
Driving procedure
■ Driving
1. With the brake pedal depressed,
shift the shift lever to D.
2. If the parking brake is in manual
mode, release the parking brake.
3. Gradually release the brake pedal
and gently depress
Position Initialization Incomplete (B2343)
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