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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Steering Pad Switch Circuit
DESCRIPTION This circuit sends an operation signal from the steering pad switch assembly to the radio receiver assembly. If there is an open in the circuit, the audio system cannot be operated using the steering pad switch assembly. If there is a short in the circuit, the same condition as when a sw
Installation
INSTALLATION PROCEDURE 1. INSTALL RADIO SETTING CONDENSER (a) Engage the claw to install a new terminal cover to the wire harness. NOTICE:
Make sure to hold the crimped side of the terminal when installing the wire harness to the terminal cover.
Make sure not to bend the exposed wire when
