How To Repair 2009 Gmc Passenger Door Lock

A relay is an electromagnetic switch operated by a relatively small electrical current that can plough a much larger electrical current on or off. The centre of a relay is an electromagnet (a gyre of wire that becomes a temporary magnet when electricity flows through it). Yous can think of a relay equally a kind of electrical lever: switch it on with a tiny electric current and information technology switches on ("leverages") some other appliance using a much bigger electric current.

Equally the proper name suggests, many relays are incredibly sensitive pieces of electronic equipment and produce only small electrical currents. Merely often we need them to operate bigger pieces of apparatus that use bigger currents. Relays bridge the gap, making it possible for modest currents to actuate larger ones. That means relays can work either as switches (turning things on and off) or every bit amplifiers (converting small currents into larger ones).

When power flows through the first circuit, it activates the electromagnet, generating a magnetic field that attracts a contact and activates the 2nd circuit. When the power is switched off, a spring pulls the contact support to its original position, switching the second circuit off over again. The input excursion is switched off and no current flows through it until something (either a sensor or a switch closing) turns information technology on. The output circuit is as well switched off.

A door lock relay can be located in iv different places on a vehicle, including:

Nether the dash on the wall by the brake pedal
Under the dash in the middle of the cab behind the stereo
Under the dash backside the passenger air bag
In the engine compartment on the firewall on the passenger side

Information technology is a sign of door lock relay failure when you're trying to operate the door lock switches on the door panel and the door locks will not activate. Commonly the computer volition override the relay circuit when using a keyless remote access to the locks, routing the power through the warning system provided that the vehicle is equipped with an alarm of some sort. A primal can all the same manually unlock the doors.

Some figurer codes that may be displayed for a failed door lock relay include:

B1300
B1301
B1309
B1310
B1311
B1341
B1392
B1393
B1394
B1395
B1396
B1397

The post-obit footstep-past-step guide volition walk you through replacing this part in the event that it fails.

Part i of 3: Preparing to supercede the door lock relay

Having all of the necessary tools and materials prior to starting the work volition allow you lot to get the job done more than efficiently.

Materials Needed

Allen wrench ready
Boxed end wrenches
Cross tip, or phillips head, screwdriver
Disposable gloves
Electrical cleaner
Flat tip screwdriver
Needle nose pliers
New door lock relay
Nine-volt battery saver
Ratchet with metric and standard sockets
Torques flake ready
Wheel chocks

Pace one: Position the vehicle. Park your vehicle on a flat, hard surface. Make sure that the transmission is in park.

wheel chocks placed around a tire

Step 2: Secure the vehicle. Identify wheel chocks effectually the tires. Engage the parking brake to the lock the rear tires and go along them from moving.

hand connecting the battery saver to the cigarette lighter

Footstep 3: Install a nine-volt battery saver. Plug the bombardment saver into your cigarette lighter.

This will proceed your estimator live and continue your settings electric current in the vehicle. If you lot do not take a 9 volt battery saver, though, that's okay.

hand disconnecting the battery

Step 4: Open the hood and disconnect the battery. Remove the negative post from the battery terminal. This disconnects the ability to the door lock relay.

Part ii of iii: Replacing the door lock relay

For those located under the dash by the brake pedal:

open panel showing the fuse box with door lock relay

Step ane: Observe the door lock relay. Become to the breaker panel on the wall side by side to the brake pedal. Using a diagram, locate the door lock relay.

Pace two: Remove the one-time door lock relay. With a pair of needle nose pliers, pull out the relay.

Step 3: Install the new door lock relay. Get the new relay out of its package. Install the new relay into the slot in which the old ane sat.

For those located under the dash in the center of the cab behind the stereo:

hand removing the panel beneath the stereo

Step 1: Find the door lock relay. Remove the panel that covers the expanse under the stereo. Locate the door lock relay next to the calculator.

Pace 2: Remove the old door lock relay. Using a pair of needle olfactory organ pliers, pull out the old relay.

Step iii: Install the new door lock relay. Get the new relay out of its bundle. Install it into the slot in which the one-time i sat.

Pace 4: Supervene upon the console. Reinstall the panel that covers the area nether the stereo.

For those located under the dash behind the passenger air bag:

person removing the glove box

Step 1: Remove the glove box. Remove the glove box so that y'all tin go to the screws that hold the finishing console in a higher place the glove box in identify.

hand removing the panel above the glove box

Pace two: Remove the finishing panel in a higher place the glove box. Undo the screws holding the panel in place and remove the panel.

air bag deploying

Alarm: Make sure that the battery has been asunder prior to removal of the air bag or serious injury may occur.

hand revealing passenger air bag to remove it

Step 3: Remove the rider air bag. Disengage the bolts and basics that hold the rider air bag in place. And so lower the air bag and disconnect the harness. Take the air bag out of the dashboard.

passenger compartment relay box

Step 4: Locate the door lock relay. Find the relay inside the dash expanse you but opened upwards.

Pace five: Remove the sometime door lock relay. Using a pair of needle nose pliers, pull out the old relay.

Step 6: Install the new door lock relay. Get the new relay out of its parcel. Install it into the slot in which the sometime one sabbatum.

diagram of bolts to be reinstalled to replace the passenger air bag

Step vii: Replace the passenger air bag. Plug in the harness to the air bag and lock the tab. Reinstall the bolts and nuts to secure the air bag.

hand replacing screws to put finishing panel above glove box back into dash

Step viii: Reinstall the finishing panel. Place the finishing console back into the nuance above the glove box compartment and spiral in all the fasteners that were used to concord it in.

hand replacing the glove box

Step nine: Replace the glove box. Reinstall the glove box back into its compartment.

If you lot had to remove the air cylinders, be sure to put them back on the correct height adjustment setting.

For those located in the engine compartment on the firewall on the passenger side:

example of fuse box under hood with door lock relay

Footstep i: Notice the door lock relay. Open up the hood if information technology is non already open up. Locate the relay next to the cluster of different relays and solenoids.

Step 2: Remove the sometime door lock relay. Using a pair of needle nose pliers, pull out the old relay.

Pace iii: Install the new door lock relay. Get the new relay out of its parcel. Install information technology into the slot in which the old one sat.

Part 3 of 3: Testing the new door lock relay

Step one: Reconnect the bombardment. Hook upwardly the negative battery cable to the negative terminal. This will supply ability to the new door lock relay.

You tin can now remove the nine-volt battery saver from the cigarette lighter.

hand operating the lock switch

Footstep two: Operate the door lock switches. Locate the door lock switches on the front doors and try the switches. If everything was done properly, the locks should now operate correctly.

If you withal cannot get the door locks to piece of work after replacing the door lock relay, then there may be further diagnosis of the door lock switch or a possible electric failure of the door lock actuator. You can always Ask a Mechanic to recieve quick, detailed advice from one of the certified mechanics at YourMechanic.

If the problem does prevarication with the door lock relay, you can use the steps in this guide to simply replace the office yourself. Notwithstanding, if y'all would feel more than comfortable having a professional person practice the job, y'all can e'er contact YourMechanic to have a certified technician come and supersede your door lock relay for y'all.

The statements expressed above are but for advisory purposes and should exist independently verified. Please see our terms of service for more details