1999 Toyota 4Runner Owners Manual - Page 115

4RUNNER ( ) Clutch start cancel switch (four- wheel drive models with manual transmission) Never use the switch for normal engine starting. Be sure to follow the starting procedure instructed in "How to start the engine" in Part 3. To crank the engine without depressing the clutch pedal, push the switch with the ignition on. The switch stays on as long as the ignition is on. And it will automatically turn off when the ignition is off. This switch cancels the clutch start system, which is designed to keep the starter motor from operating if the clutch pedal is not depressed all the way down. The switch allows the vehicle to be driven out of difficult situations by cranking the engine with the clutch engaged. 115