2009 Toyota Highlander Owners Manual - Page 260

2-5. Driving information NOTICE n To prevent the water damage Take all necessary safety measures to ensure that water damage to the hybrid battery, hybrid system or other components does not occur. l Water entering the engine compartment may cause severe damage to the hybrid system. Water entering the interior may cause the hybrid battery stowed under the rear seats to short circuit. l Water entering the hybrid transaxle will cause deterioration in transmission quality. The malfunction indicator may come on, and the vehicle may not be drivable. l Water can wash the grease from wheel bearings, causing rusting and premature failure, and may also enter the transaxle case, reducing the gear oil's lubricating qualities. n When you drive through water If driving through water, such as when crossing shallow streams, first check the depth of the water and the bottom of the river bed for firmness. Drive slowly and avoid deep water. n Inspection after off-road driving l Sand and mud that has accumulated in brake drums and around brake discs may affect braking efficiency and may damage brake system components. l Always perform a maintenance inspection after each day of off-road driving that has taken you through rough terrain, sand, mud, or water. For scheduled maintenance information, refer to the "Scheduled Maintenance Guide" or "Owner's Manual Supplement". 230