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
SEE MORE:
Dtc Check / Clear
DTC CHECK / CLEAR DTC CHECK (a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Vehicle Proximity Notification System / Trouble Codes. Body Electrical > Vehicle Proximity Notification System > T
Operation Check
OPERATION CHECK DCM OPERATION HISTORY HINT:
This function shows the telematics network status when the DCM (telematics transceiver) was operated. Use this when no DTC is present but this telematics system was unable to connect to the call center. This symptom may occur if cell phone signal streng
