Lexus NX: If the 12-volt battery is discharged

The following procedures may be used to start the hybrid system if the vehicle's 12-volt battery is discharged.

You can also call your Lexus dealer or a qualified repair shop.

Restarting the hybrid system

If you have a set of jumper (or booster) cables and a second vehicle with a 12- volt battery, you can jump start your vehicle by following the steps below.

1. Confirm that the electronic key is being carried.

When connecting the jumper (or booster) cables, depending on the situation, the alarm may activate and the doors may lock.

Lexus NX. Steps to take in an emergency

2. Open the hood and fuse box cover.

Lexus NX. Steps to take in an emergency

3. Open the exclusive jump starting terminal cover.

Lexus NX. Steps to take in an emergency

4. Remove the engine cover.

Lexus NX. Steps to take in an emergency

5. Connect a positive jumper cable clamp to A on your vehicle and connect the clamp on the other end of the positive cable to B on the second vehicle. Then, connect a negative cable clamp to C on the second vehicle and connect the clamp at the other end of the negative cable to D.

Lexus NX. Steps to take in an emergency

  1. Exclusive jump starting terminal (your vehicle)
  2. Positive (+) battery terminal (second vehicle)
  3. Negative (-) battery terminal (second vehicle)
  4. Solid, stationary, unpainted metallic point away from the exclusive jump starting terminal and any moving parts as shown in the illustration

6. Start the engine of the second vehicle.

Increase the engine speed slightly and maintain at that level for approximately 5 minutes to recharge the 12-volt battery of your vehicle.

7. Open and close any of the doors of your vehicle with the power switch off.

8. Maintain the engine speed of the second vehicle and start the hybrid system of your vehicle by turning the power switch to ON mode.

9. Make sure the "READY" indicator comes on. If the indicator light does not come on, contact your Lexus dealer.

10. Once the hybrid system has started, remove the jumper cables in the exact reverse order from which they were connected.

11. Close the exclusive jump starting terminal cover, and reinstall the fuse box cover to its original position.

Once the hybrid system starts, have the vehicle inspected at your Lexus dealer as soon as possible.

■Starting the hybrid system when the 12- volt battery is discharged The hybrid system cannot be started by push-starting.

■To prevent 12-volt battery discharge

■Charging the 12-volt battery The electricity stored in the 12-volt battery will discharge gradually even when the vehicle is not in use, due to natural discharge and the draining effects of certain electrical appliances. If the vehicle is left for a long time, the 12-volt battery may discharge, and the hybrid system may be unable to start. (The 12-volt battery recharges automatically while the hybrid system is operating.)

■When the 12-volt battery is removed or discharged

■When replacing the 12-volt battery

Lexus NX. Steps to take in an emergency

For details, consult your Lexus dealer.


■Avoiding 12-volt battery fires or explosions Observe the following precautions to prevent accidentally igniting the flammable gas that may be emitted from the 12- volt battery:

■12-volt Battery precautions The 12-volt battery contains poisonous and corrosive acidic electrolyte, while related parts contain lead and lead compounds.

Observe the following precautions when handling the 12-volt battery:

■After recharging the 12-volt battery Have the 12-volt battery inspected at your Lexus dealer as soon as possible.

If the 12-volt battery is deteriorating, continued use may cause the 12-volt battery to emit a malodorous gas, which may be detrimental to the health of passengers.

■When exchanging the 12-volt battery After exchanging, securely attach the exhaust hose and exhaust hole plug to the exhaust hole of the exchanged 12- volt battery. If not properly installed, gases (hydrogen) may leak into the vehicle interior, and there is the possible danger of the gas igniting and exploding.


■When handling jumper cables When connecting the jumper cables, ensure that they do not become entangled in the cooling fans or belt.

■To prevent damaging the vehicle The exclusive jump starting terminal is to be used when charging the 12-volt battery from another vehicle in an emergency.

It cannot be used to jump start another vehicle.


 If your vehicle overheats

The following may indicate that your vehicle is overheating. The needle of the engine coolant temperature gauge enters the red zone, or a loss of hybrid system power is experienced. (For

 Vehicle specifications




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 Diagnostic Trouble Code Chart

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