![]() ![]() Set DVOM to resistance and hit the brake pedalĪ good switch will show two readings an open with brake pedal at rest and closed with the brake pedal applied. ![]() Testing is easy, you can use a DVOM set to read resistance, you don’t even need to remove the switch. And for most that is a problem with the brake light switch. We won’t go into control modules in this post because for most the problem is an issue with the brake light system. So as you can see brake light systems aren’t very complex but some may include control modules. When the control module responsible for shift lever lock (varies by vehicle) receives a 12-volt signal, it, in turn, activates the shift lock solenoid which releases the shifter. Applying the brakes releases the plunger and allows voltage flow to the brake lights which completes the circuit. The brake switch circuit typically runs 12 volts and the default position is open. Pressing the brake pedal releases the switch plunger, which powers the brake lights but also signals control modules like ECU, ABS, TCM, etc. The brake light switch incorporates a plunger that’s located below the driver’s dash attached to the brake pedal box assembly. How the brake light switch worksĪ brake light switch couldn’t be simpler, it’s a switch that opens and closes with a brake application. So that’s where we’ll turn our attention. You already know a shift lock won’t release without a working brake light System. ![]() Option oneīefore releasing the shifter note the following:Ī shift lock issue combined with a loss of brake lights pretty much diagnoses your fault conclusively as a failure in the brake light system. The emergency shifter release lever is usually brightly colored to make life easy, use your phone light to help find it. To access the shifter assembly, use plastic tools to pry up the facia. The location of your shifter’s emergency release is covered in your driver’s manual but for most cars access is easy and you’ll typically have a few options to access them. Some manufacturers make it a ton easier than others. It allows, for example, a tow truck to move your vehicle even when the battery is flat.įinding the release button is sometimes the most challenging part of this procedure. It’s a bypass for the shift lock if you like. The good news is, all vehicles have an emergency shift lock release in case of failure. How To Access The Emergency Shift Lock Release The second lock is controlled by a solenoid fitted to the shifter assembly. The first lock is controlled (usually) by a remote solenoid (located at the ignition switch) and a cable. Where’s The Shift Lock Located?īoth locks are located on the shifter assembly (under selector) and are a mechanical affair. This causes the parking cable to release and the ignition key may be removed. In addition, the ignition key can’t be removed until the shifter is placed back in Park. Activating the brake pedal energizes the second solenoid and releases the second lock. The locks work in combination, turning the ignition to “ON” energizes the ignition park solenoid and causes it to push on a mechanical cable which releases the first part of the shifter lock. ![]() They are an ignition park lock solenoid and a shift lock solenoid. Many systems comprise two locks controlled by two electrical solenoids. The part electrical and part mechanical type is most common. The shift interlock system may be electrical, electrical/mechanical, or mechanical. In a healthy system, with the ignition on, the shift lock can be heard to click on and off with brake pedal application. A child, pet, or operator could accidentally hit the shifter, with auto transmissions that’s a real concern. Shift interlock or shift lock is a safety feature fitted to automatic transmission cars, its function is to prevent accidental runaway vehicles. It’s worth also checking for blown brake light bulbs – Check brake lamp bulbs are the correct type and fitted correctly. If that sounds like your problem, check out this post, you may find it helpful “Car fuse keeps blowing”. Check and replace the fuse is blown.Ī fuse that blows immediately indicates a short in the wiring system. The handbook is often the faster route as modern cars have more than one fuse box.Īfter locating the correct fuse, remove it using the tool fixed to the rear of the fuse box cover. The fuse number will be listed on the fuse box cover or in the driver’s handbook. But we’ll check the brake light system anyway, as checking the fuse only takes a few moments and is a lot less work than locating and releasing the emergency park release. A blown fuse generally is a common problem, it’s not however the most common cause of a shifter that won’t move with no brakes lights. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |