Lexus ES: System Diagram
SYSTEM DIAGRAM
(a) The CAN communication system is composed of 5 buses.
 | CAN Main Bus Line |  | Terminating Resistor |
 | CAN Branch Line | * | Gateway Function Equipped ECU |
.png) | Bus Monitoring Direction | - | - |
| Connected to | Code | ECU/Sensor Name | CAN DTC Storage | Note |
|---|---|---|---|---|
| - | CGW | Central Gateway ECU (Network Gateway ECU) | - | - |
| - | DLC3 | DLC3 | - | - |
| Bus 1 | GRS | Swing Grille Actuator Assembly | - | - |
| F-CAM | Forward Recognition Camera | Available | - | |
| CS | Clearance Warning ECU Assembly | Available | w/ Parking Support Alert System | |
| PAC | Parking Assist ECU | Available | w/ Panoramic View Monitor System | |
| F-MR | Millimeter Wave Radar Sensor Assembly | Available | - | |
| BSM | Blind Spot Monitor Sensor RH | Available | w/ Blind Spot Monitor System | |
| R-CA | Rear Television Camera Assembly | Available | - | |
| CAN J/C NO. 1 | No. 1 CAN Junction Connector | - | - | |
| CAN J/C NO. 6 | No. 6 CAN Junction Connector | - | - | |
| ST | No. 1 CAN Junction Terminal | - | - | |
| Bus 2 | HV | Hybrid Vehicle Control ECU | Available | - |
| VAS | Vehicle Approaching Speaker Controller | Available | - | |
| BRK | Brake Booster with Master Cylinder Assembly | Available | - | |
| F-MGC | Inverter with Converter Assembly | Available | - | |
| ENG | ECM | Available | - | |
| CAN J/C NO. 4 | No. 4 CAN Junction Connector | - | - | |
| J/C NO. 2 | No. 2 Junction Connector | - | - | |
| Bus 3 | DCM | DCM (Telematics Transceiver) | Available | w/ Telematics Transceiver |
| AV | Radio Receiver Assembly | Available | - | |
| YGW | Option Connector (Bus Buffer ECU) | - | w/ CAN Compatible Optional Devices | |
| ANC | Stereo Component Equalizer Assembly | Available | - | |
| CAN J/C NO. 4 | No. 4 CAN Junction Connector | - | - | |
| Bus 4 | TPMS | Tire Pressure Warning ECU and Receiver | Available | - |
| OCS | Occupant Detection ECU | Available | - | |
| STR | Steering Sensor | - | - | |
| EPS | Rack and Pinion Power Steering Gear Assembly | Available | - | |
| HV | Hybrid Vehicle Control ECU | Available | - | |
| PKB | Brake Actuator Assembly | Available | - | |
| BRK | Brake Booster with Master Cylinder Assembly | Available | - | |
| ENG | ECM | Available | - | |
| SRS | Airbag ECU Assembly | Available | - | |
| CAN J/C NO. 2 | No. 2 CAN Junction Connector | - | - | |
| CAN J/C NO. 4 | No. 4 CAN Junction Connector | - | - | |
| CAN J/C NO. 7 | No. 7 CAN Junction Connector | - | - | |
| Bus 5 | MIR-R | Outer Mirror Control ECU Assembly RH | Available | w/ Seat Position Memory System |
| LITS | Headlight ECU Sub-assembly RH | Available | - | |
| DST | Position Control ECU Assembly LH | - | w/ Seat Position Memory System | |
| MIR-L | Outer Mirror Control ECU Assembly LH | Available | w/ Seat Position Memory System | |
| BKD | Luggage Closer Motor Assembly | Available | w/ Power Trunk Lid System | |
| T&T | Multiplex Tilt and Telescopic ECU | Available | w/ Power Tilt and Power Telescopic System | |
| HUD | Meter Mirror Sub-assembly | Available | w/ Headup Display System | |
| MB | Main Body ECU (Multiplex Network Body ECU) | Available | Connected to LIN communication system | |
| SMT | Certification ECU (Smart Key ECU Assembly) | Available | - | |
| A/C | Air Conditioning Amplifier Assembly | Available | - | |
| LITM | Headlight ECU Sub-assembly LH | Available | - | |
| MET | Combination Meter Assembly | Available | - | |
| CAN J/C NO. 5 | No. 5 CAN Junction Connector | - | - | |
| CAN J/C NO. 8 | No. 8 CAN Junction Connector | - | - | |
| J/C NO. 1 | No. 1 Junction Connector | - | - |
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Parts Location
PARTS LOCATION ILLUSTRATION *1 SWING GRILLE ACTUATOR ASSEMBLY *2 MILLIMETER WAVE RADAR SENSOR ASSEMBLY *3 HEADLIGHT ECU SUB-ASSEMBLY RH *4 INVERTER WITH CONVERTER ASSEMBLY *5
Precaution
PRECAUTION NOTICE FOR INITIALIZATION NOTICE: When disconnecting the cable from the negative (-) auxiliary battery terminal, initialize the following systems after the cable is reconnected. System
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Disassembly
DISASSEMBLY PROCEDURE 1. REMOVE END COVER (a) To prevent the coupling of the vacuum pump assembly from contacting the workbench, support the vacuum pump assembly with wooden blocks or an equivalent object. *a Wooden Block (b) Using a T30 "TORX" socket wrench, remove the 5
Headlight ECU RH Communication Stop Mode
DESCRIPTION Detection Item Symptom Trouble Area Headlight ECU RH Communication Stop Mode Any of the following conditions are met:
Communication stop for "HL AutoLeveling/AFS/AHS (Sub)" is indicated on the "Communication Bus Check" screen of the Techstream.
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Communicat
