Lexus NX: Hybrid system precautions

Take care when handling the hybrid system, as it is a high voltage system (about 650 V at maximum) as well as contains parts that become extremely hot when the hybrid system is operating. Obey the warning labels attached to the vehicle.

System components

Lexus NX. Hybrid system

The illustration is an example for explanation and may differ from the actual item.

  1. Warning label
  2. Hybrid battery (traction battery)
  3. Rear electric motor (traction motor)
  4. Service plug
  5. High voltage cables (orange)
  6. Front electric motor (traction motor)
  7. Power control unit
  8. Air conditioning compressor

■Running out of fuel When the vehicle has run out of fuel and the hybrid system cannot be started, refuel the vehicle with at least enough gasoline to make the low fuel level warning light go off. If there is only a small amount of fuel, the hybrid system may not be able to start. (The standard amount of fuel is about 2.7 gal. [10.1 L, 2.2], when the vehicle is on a level surface. This value may vary when the vehicle is on a slope. Add extra fuel when the vehicle is inclined.)

■Electromagnetic waves

■Hybrid battery (traction battery) The hybrid battery (traction battery) has a limited service life. The lifespan of the hybrid battery (traction battery) can change in accordance with driving style and driving conditions.


■High voltage precautions This vehicle has high voltage DC and AC systems as well as a 12-volt system. DC and AC high voltage is very dangerous and can cause severe burns and electric shock that may result in death or serious injury.

Lexus NX. Hybrid system

■Road accident cautions Observe the following precautions to reduce the risk of death or serious injury:


■Hybrid battery (traction battery)

Unless the battery is properly collected, the following may occur, resulting in death or serious injury:

When reselling or handing over your vehicle, the possibility of an accident is extremely high because the person receiving the vehicle may not be aware of these dangers.


■Hybrid battery (traction battery) Do not carry large amounts of water such as water cooler bottles in the vehicle.

If water spills onto the hybrid battery (traction battery), the battery may be damaged.

Have the vehicle inspected by your Lexus dealer.

Hybrid battery (traction battery) air intake and discharge vents

The cooling air intake and discharge vents for the hybrid battery (traction battery) are located under the rear seats and between the rear seats and deck board, respectively. If the air intake vents are blocked, it could lead to a reduction in hybrid battery (traction battery) output.

The hybrid battery (traction battery) output will not be reduced, even if the space between the upper part of the air discharge vents on the back of the rear seat and deck board is blocked with luggage, etc.

Lexus NX. Hybrid system

  1. Air intake vents
  2. Air discharge vents


■Hybrid battery (traction battery) air intake and discharge vents

Emergency shut off system

When a certain level of impact is detected by the impact sensor, the emergency shut off system blocks the high voltage current and stops the fuel pump to minimize the risk of electrocution and fuel leakage. If the emergency shut off system activates, your vehicle will not restart. To restart the hybrid system, contact your Lexus dealer.

Hybrid warning message

A message is automatically displayed when a malfunction occurs in the hybrid system or an improper operation is attempted.

If a warning message is shown on the multi-information display, read the message and follow the instructions.

Lexus NX. Hybrid system

■If a warning light comes on, a warning message is displayed, or the 12-volt battery is disconnected The hybrid system may not start. In this case, try to start the system again. If the "READY" indicator does not come on, contact your Lexus dealer.


 Theft deterrent system

Immobilizer system The vehicle's keys have built-in transponder chips that prevent the hybrid system from starting if a key has not been previously registered in the vehicle's on-board computer

 Vehicle status information and indicators

 Warning lights and indicators

The warning lights and indicators inform the driver of the status of the vehicle's various systems. Instrument cluster For the purpose of explanation, the following illustration displays all wa


 IG Power Supply Voltage (C1551)

DESCRIPTION The power steering ECU assembly distinguishes the power switch status as on (IG) or off through the IG power source circuit. DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition C1551 IG Power Supply Voltage IG power

 Hazard Warning Switch Circuit

DESCRIPTION When the combination meter receives a hazard warning signal switch signal, the flasher IC turns on and hazard control is performed. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: When replacing the combination meter assembly, make sure to replace it with a new one. PROCEDURE 1. RE

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