Lexus ES: Terminals Of Ecu
TERMINALS OF ECU
CHECK PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)
| *a | Front view of wire harness connector (to Parking Brake ECU (Brake Actuator Assembly)) | - | - |
(a) Disconnect the A54 parking brake ECU (brake actuator assembly) connector.
(b) Measure the voltage and resistance according to the value (s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| A54-9 (BEPB) - Body ground | R - Body ground | Parking brake power supply | Power switch off | 11 to 14 V |
| A54-26 (IG) - Body ground | B - Body ground | IG power supply | Power switch on (IG) | 8 to 16 V |
| A54-2 (EGND) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
| A54-14 (SWI1) - Body ground | P - Body ground | Electric parking brake switch assembly | - | - |
| A54-24 (SWI2) - Body ground | W - Body ground | Electric parking brake switch assembly | - | - |
| A54-20 (SWO1) - Body ground | SB - Body ground | Electric parking brake switch assembly | - | - |
| A54-22 (SWO2) - Body ground | V - Body ground | Electric parking brake switch assembly | - | - |
| A54-4 (MRR+) - Body ground | LA-Y - Body ground | Parking brake motor RH (parking brake actuator assembly RH) (+) | - | - |
| A54-3 (MRR-) - Body ground | LA-L - Body ground | Parking brake motor RH (parking brake actuator assembly RH) (-) | - | - |
| A54-7 (MRL+) - Body ground | LA-G - Body ground | Parking brake motor LH (parking brake actuator assembly LH) (+) | - | - |
| A54-8 (MRL-) - Body ground | LA-W - Body ground | Parking brake motor LH (parking brake actuator assembly LH) (-) | - | - |
| A54-27 (SPD) - Body ground | L - Body ground | Vehicle speed direct input | - | - |
| A54-12 (CANH) - Body ground | B - Body ground | CAN communication line H | - | - |
| A54-11 (CANL) - Body ground | W - Body ground | CAN communication line L | - | - |
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Test Mode Procedure
TEST MODE PROCEDURE *1 Rear Disc Brake Piston *2 Nut *a The nut moves inward in pad replacement mode REAR BRAKE PAD REPLACEMENT MODE HINT: When replacing the rear disc brake pad a
Control Module Communication Bus OFF (U0073,U0100,U0124,U0129,U0293)
DESCRIPTION The parking brake ECU (brake actuator assembly) communicates with the hybrid vehicle control ECU assembly, skid control ECU (brake booster with master cylinder assembly) and deceleration s
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Installation
INSTALLATION CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH side and LH side.
The following procedure is for the LH side.
PROCEDURE 1. INSTALL BODY ROCKER PANEL MOULDING ASSEMBLY (a) Engage the 9 clips as shown in the illustration. Install in this Direction - -
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
