Child Safety Locks
These are Child Safety Lock Malfunction Indicator symbols. If the vehicle is equipped with a button on the driver’s door that activates the system, press it again. If the warning light or lights persist, have the system serviced as soon as possible.
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This version indicates that the Child Safety Lock is on. If the letter L or R is seen with it, it indicates which door is locked. When turned on, the Child Safety Lock system disables the function of both the inner door handles and power window switches for the rear doors. It is an important safety feature designed to protect curious children from injury while passengers in a vehicle.
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Remember that only proper service and repair procedures will ensure the safe and reliable operation of your car. In addition, proper safety procedures and precautions, such as the use of safety goggles, the right tools and the equipment should be followed at all times to eliminate the possibility of personal injury or improper service which could damage the vehicle or compromise its safety.
These posts are for information sharing purposes only, and should not be used in lieu of an OEM service manual or factory authorized service procedure. We are not in the auto repair business nor do we publish automotive service manuals. Nothing we include on these pages and posts has been reviewed, approved or authorized by any vehicle manufacturer.
Technology is always changing and what is current and accurate today may be literally out-of-date and inaccurate tomorrow. And when it comes to the current state of flux in the auto industry, nothing is more true.
The author has 25 years of automotive experience and has assembled the most extensive collection of symbols and warning lights anywhere (over 1,000!) and can help you open and start any keyless start car with a dead key fob battery. BA, St. Joseph’s College, ME: MS, Rensselaer Polytechnic Institute, NY
These are Tow Bar Not Locked Indicator 
These are Security and/or Immobilizer System Indicator 
The 
However, if any of these symbols is visible when the vehicle is operating, it indicates a malfunction in the security system. The red dot to the left is on old style indicator. If the engine does not start with the correct key, and the security indicator remains on or flashes, the system may have a malfunction. You will need to contact your dealer or authorized service center in either case.
Do not confuse these with other automotive trouble symbols that make use of the image a key. Click 
These are all versions of Differential Lock Indicator 
This version, an AWD LOW indicator, also says that the vehicles axles are locked together in low gear. All the wheels will turn at the same rate, and should only be operated at low speed in slippery conditions, which is also why this indicator and all the others are shown in 
If this system is accidentally engaged, your vehicle will hitch and buck and feel like it is going to tear itself apart at normal speeds. Come to a stop and look for the symbol on your dash or console and disengage the system. Drive forward or backward a few feet to complete the disengagement.
This version, seen in black and white, is seen in the information display and will be accompanied by a text explanation. The open circle in the center indicates a malfunctioning differential lock. Again, a helpful explanation will be seen with the warning light, although resolving the problem will likely require a qualified repair shop.
The indicator may turn up as symbols in all text, like the Diff (differential) Lock or All Wheel Drive (AWD) Lock Indicators shown here to the left. They mean the same as the images above.
These are Rear Differential Lock indicators. The versions on the left features a large closed circle or a pad lock between the two rear (bottom) wheels. The version to the right uses an X in place of the closed circle and is an Electronic Rear Differential Lock indicator. Both versions indicate that the two rear wheels have been locked to rotate together. Like the center lock options above, a button or dial on the dashboard or center console has been engaged locking the wheels and can be turned off.
The exclamation point indicates a malfunction on the differential lock system. It is likely electronic, so try restarting the vehicle. If the vehicle is equipped with an Information Display and a CHECK DIFFERENTIAL or DIFFERENTIAL MALFUNCTION message is shown, contact your dealer. If the vehicle hitches and bucks like a bronco at speeds above 20 MPH and the Lock cannot be disengaged, reduce speed and go straight to your dealer or service center, or have the vehicle towed.
There are now options to lock either or both of the front and rear axles electronically from some manufacturers. These padlock images are Front and Rear Axle Lock Indicator symbols. The image with the double locks indicate that both front and rear locks have been engaged.