2018-Navigator-Owners-Manual

Maintenance

Battery Management System (If Equipped) The battery management system monitors battery conditions and takes actions to extend battery life. If excessive battery drain is detected, the system temporarily disables some electrical systems to protect the battery. Systems included are: • Heated rear window. • Heated seats. • Climate control. • Heated steering wheel. • Audio unit. • Navigation system. A message may appear in the information displays to alert you that battery protection actions are active. These messages are only for notification that an action is taking place, and not intended to indicate an electrical problem or that the battery requires replacement.

Because your vehicle’s engine is electronically controlled by a computer, some control conditions are maintained by power from the battery. When the battery is disconnected or a new battery is installed, the engine must relearn its idle and fuel trim strategy for optimum driveability and performance. Flexible fuel vehicles (FFV) must also relearn the ethanol content of the fuel for optimum driveability and performance. To restore the settings, do the following: 1. Apply the parking brake. 2. Shift into park (P) or neutral (N). 3. Switch off all accessories. 4. Press the brake pedal and start your vehicle. 5. Run the engine until it reaches normal operating temperature. While the engine is warming up, complete the following: Reset the clock. Reset the power windows bounce-back feature. See Windows and Mirrors (page 106). Reset the radio station presets. See Audio System (page 434).

6. Allow the engine to idle for at least one minute. 7. Drive the vehicle at least 10 mi (16 km) to completely relearn the idle trim and fuel trim strategy. Note: If you do not allow the engine to relearn the idle and fuel trim strategy, the idle quality of your vehicle may be adversely affected until the engine computer eventually relearns the idle trim and fuel trim strategy. Note: For flexible fuel vehicles, if you are operating on E85, you may experience poor starts or an inability to start the engine and driveability problems until the fuel trim and ethanol content have been relearned. Make sure that you dispose of old batteries in an environmentally friendly way. Seek advice from your local authority about recycling old batteries. If storing your vehicle for more than 30 days without recharging the battery, we recommend that you disconnect the battery cables to maintain battery charge for quick starting.

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Navigator (TB9) Canada/United States of America, enUSA, Edition date: 201708, First Printing