Lexus ES: Terminals Of Ecu
TERMINALS OF ECU
CHECK SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)
| *a | Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly)) | - | - |
(a) Disconnect the A40 skid control 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 |
|---|---|---|---|---|
| A40-30 (+BS) - Body ground | G - Body ground | Parking brake motor power supply | Always | 11 to 14 V |
| A40-36 (IG1) - Body ground | B - Body ground | IG power supply | Engine switch on (IG) | 11 to 14 V |
| A40-46 (GND1) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
| A40-14 (GND2) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
| A40-2 (MRR+) - Body ground | Y - Body ground | Parking brake motor RH (parking brake actuator assembly RH) (+) | - | - |
| A40-3 (MRR-) - Body ground | L - Body ground | Parking brake motor RH (parking brake actuator assembly RH) (-) | - | - |
| A40-13 (MRL+) - Body ground | G - Body ground | Parking brake motor LH (parking brake actuator assembly LH) (+) | - | - |
| A40-12 (MRL-) - Body ground | W - Body ground | Parking brake motor LH (parking brake actuator assembly LH) (-) | - | - |
| A40-31 (SWI1) - Body ground | P - Body ground | Electric parking brake switch assembly | - | - |
| A40-32 (SWO1) - Body ground | SB - Body ground | Electric parking brake switch assembly | - | - |
| A40-15 (SWI2) - Body ground | W - Body ground | Electric parking brake switch assembly | - | - |
| A40-16 (SWO2) - Body ground | V - Body ground | Electric parking brake switch assembly | - | - |
| A40-5 (CANH) - Body ground | Y - Body ground | CAN communication line H | - | - |
| A40-19 (CANL) - Body ground | W - Body ground | CAN communication line L | - | - |
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Test Mode Procedure
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Vehicle Control History
VEHICLE CONTROL HISTORY DESCRIPTION
Vehicle Control History is a function that captures and stores ECU data when triggered by specific vehicle behavior.
If the customer states that the engine sta
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Brake Control Warning Light Remains ON
DESCRIPTION The skid control ECU (brake booster with master cylinder assembly) is connected to the combination meter assembly via CAN communication. If the skid control ECU (brake booster with master cylinder assembly) stores a DTC, the brake warning light / yellow (minor malfunction) comes on in th
Installation
INSTALLATION PROCEDURE 1. INSTALL NAVIGATION ECU 2. INSTALL NO. 1 RADIO RECEIVER BRACKET (a) Install the No. 1 radio receiver bracket with the 2 screws. 3. INSTALL NAVIGATION ECU WITH BRACKET (a) Engage the 4 claws to temporarily install the navigation ECU with bracket as shown in the illustration.
