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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Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT:
Use the table below to help determine the cause of problem symptoms.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.
Because the order of diagnosis is important to allow correct diagnosis, make sure to begin trouble
