The back-up light switch is described to be installed on the Mazda and Mitsubishi transmissions, though it can only be identified when the parking brake is engaged and the gear shift lever is set to Position other than Neutral or Reverse. After that, lift and provide proper standing for the car properly. Despite what the manufacturer says about no fluid leaking from the transmission when the switch is disconnected, it is recommended that a drain pan be placed beneath just in case. Remove the back-up light switch from the transmission by pulling the electrical wire harness plug of the switch and detaching it. Similarly, for putting back the parts follow the procedures followed while removal, and depending on the situation, check the transmission fluid level and add more of it as perhaps required.