Lexus ES: Precaution
PRECAUTION
PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL
NOTICE:
When disconnecting the cable from the negative (-) battery terminal, initialize the following system(s) after the cable is reconnected:
| System | See Procedure |
|---|---|
| Lane Control System | |
| Pre-collision System | |
| Parking Support Brake System | |
| Lighting System | |
| Parking Assist Monitor System | |
| Panoramic View Monitor System | |
| Power Trunk Lid System |
HANDLING PRECAUTION FOR DYNAMIC RADAR CRUISE CONTROL SYSTEM
Keep in mind the following points when servicing vehicles equipped with the dynamic radar cruise control system.
(a) The dynamic radar cruise control system is designed to be used when driving on highways and freeways. As the system may not operate correctly when driving on roads used by pedestrians and bicycles, do not use dynamic radar cruise system on roads used by pedestrians and bicycles as an accident may result.
(b) Do not overly rely on the dynamic radar cruise control system.
- The dynamic radar cruise control system is designed to assist in maintaining an appropriate distance with the preceding vehicle, however, the system alone is not sufficient. Pay constant attention to the vehicle-to-vehicle distance and the traffic conditions when using the dynamic radar cruise control system and decelerate with the brake pedal or accelerate with the accelerator pedal according to the situation to keep an appropriate distance with the preceding vehicle.
- The dynamic radar cruise control system applies brakes as necessary, however, there is a limitation on the deceleration control capability. When the preceding vehicle decelerates rapidly or another vehicle moves in front of the vehicle, decelerating in time to avoid a collision may not be possible without additional braking.
(c) The millimeter wave radar sensor assembly dirt detection function.
- The millimeter wave radar sensor assembly can automatically detect dirt on the sensor face or the front or back surface of the front emblem, however, dirt may not always be detected.
- The dirt detection function may not operate if a metal object or plastic sheet with metal coating is attached to the sensor or the front emblem.
- The dirt detection function may not operate if there is snow or ice on the sensor or the front emblem.
HINT:
The preceding conditions may result in the vehicle being unable to maintain an appropriate distance with the preceding vehicle.
(d) Keep the sensor face and the front and back surfaces of the front emblem clean.
(e) The dynamic radar cruise control system does not operate or give a vehicle approach warning for vehicles which are stopped or driving at significantly slower speeds.
(f) When following another vehicle with vehicle-to-vehicle distance control mode controlling vehicle speed, the vehicle will not accelerate if the +RES switch is pushed, as the speed is controlled in accordance with the speed of the preceding vehicle.
NOTICE:
If the set vehicle speed is increased by pushing the +RES switch, the vehicle will accelerate to the newly set speed when the preceding vehicle moves out of the lane.
HINT:
The set vehicle speed can be confirmed on the multi-information display.
(g) The actual vehicle-to-vehicle distance may be shorter than the set vehicle-to-vehicle distance when driving on a downhill road.
(h) When a system malfunction is detected, the master warning light illuminates, a warning message is displayed on the multi-information display in the combination meter assembly and the buzzer sounds.
(i) Keep the windshield glass clean.
(j) Do not apply excessive force to the forward recognition camera or subject it to a strong impact.
(k) Do not disassemble the forward recognition camera.
(l) Do not attach a sticker to the windshield glass in the area in front of the forward recognition camera.
(m) If the heater is used with FOOT mode selected, the upper area of the windshield glass may fog up, affecting the operation of the forward recognition camera.
HINT:
If the windshield glass fogs up, clear it using the front defroster.
(n) Do not damage the forward recognition camera lens or allow it to become dirty.
HINT:
- When cleaning the inner surface of the windshield glass, do not allow cleaning agent to contact the forward recognition camera lens.
- Do not touch the forward recognition camera lens.
(o) Do not place any objects on top of the instrument panel.
HINT:
If an object is reflecting off of the windshield glass, the performance of the forward recognition camera may decrease.
(p) The vehicle approach warning buzzer does not sound when constant speed control mode is controlling vehicle speed because the presence of and distance to the preceding vehicle is not calculated.
(q) As the controls performed by constant speed control mode and vehicle-to-vehicle distance control mode are different, always confirm which mode is selected before operating the dynamic radar cruise control system.
(r) When operating the turn signal when in vehicle-to-vehicle distance control mode, the distance to the preceding vehicle may reduce as part of preparation to change lanes.
(s) Take the following precautions concerning the dynamic radar cruise control system.
(1) Turn the cruise control system off using the cruise control main switch when not using the cruise control system.
(2) Be careful as the vehicle speed may increase beyond the set vehicle speed when driving downhill even when the cruise control system is controlling vehicle speed.
(3) If cruise control operation was canceled, and if the vehicle speed is within the settable speed range, pushing the +RES switch restores the vehicle speed memorized at the time of cancellation, and constant speed control resumes. If the vehicle is being driven at a constant speed, pushing the +RES switch accelerates the vehicle.
(4) If the cruise control indicator turns off and a warning message is displayed when the cruise control system is controlling vehicle speed, turn the cruise control system off then on using the cruise control main switch and set the cruise control system vehicle set speed again. If the cruise control system does not turn on or stops functioning immediately after being set, there may be a malfunction in the cruise control system.
(5) Do not use the dynamic radar cruise control system where the road conditions are as follows:
- Heavy traffic
- Steep downhill roads
- Roads with sharp turns
- Icy or snowy roads
- Slippery roads
(t) Do not use the dynamic radar cruise control system while towing.
REPLACEMENT PRECAUTIONS
(a) ECM:
- It is necessary to perform initialization after replacing the ECM.
-
Before replacing the ECM, refer to Registration.
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(b) Millimeter wave radar sensor assembly:
- When replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor assembly will not match the information from the vehicle and a DTC may be stored.
-
When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed.
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(c) Forward recognition camera:
- When replacing the forward recognition camera, replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle and a DTC may be stored.
-
If the forward recognition camera has been replaced with a new one or the windshield glass has been removed and installed, it is necessary to perform forward recognition camera adjustment.
HINT:
Forward recognition camera adjustment can be performed by using either One Time Recognition or Sequential Recognition.
One Time Recognition: Click here
Sequential Recognition: Click here
(d) Skid control ECU (brake actuator assembly):
-
After replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information.
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READ NEXT:
Definition Of Terms
DEFINITION OF TERMS Term Definition Monitor description Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and details). Related DTCs Group of di
Parts Location
PARTS LOCATION ILLUSTRATION *1 MILLIMETER WAVE RADAR SENSOR ASSEMBLY *2 FORWARD RECOGNITION CAMERA *3 BRAKE ACTUATOR ASSEMBLY - SKID CONTROL ECU *4 ECM ILLUSTRATION *1 STO
System Diagram
SYSTEM DIAGRAM
SEE MORE:
Terminals Of Ecu
TERMINALS OF ECU PARKING ASSIST ECU (a) Disconnect the N44 parking assist ECU 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 N44-1 (+B) - N44-4 (GND1
Vehicle Speed Sensor (B2415)
DESCRIPTION The headlight ECU sub-assembly LH receives speed signals from the skid control ECU (brake booster with master cylinder assembly) via CAN communication and performs light control. for LED Type Turn Signal Light DTC No. Detection Item DTC Detection Condition Trouble Area DTC Out
