Question about 1992 GMC Yukon

1 Answer

Where is the door lock relay located?

Door locks intermittently work.Will unlock but wont lock. Sometimes the actuators are sluggish to move to the lock position and other times show no attempt to move to lock position, but clearly have a draw on the battery (interior lights dim). I bought a relay to see if it made a difference but I am having trouble finding the relay location under the dash, at fuse box or under hood.

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  • Gene Holt Nov 30, 2012

    This is what the relay looks like.http://i.ebayimg.com/t/RY246-DOOR-LOCK-R...$(KGrHqRHJBoE7yLOZpbWBPFPr451qg~~_35.JPG?set_id=89040003C1 Is there any other info I could share to help find an answer?

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The relay or switch may be shorting, check other door lock controls for correct function, this will rule out relay and isolate the switch or rule out master switch and isolate relay.

Posted on Dec 12, 2015

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2005 Chevy Equinox Driver & Passenger Door Unlock Relay. How To Remove & Install. They Are Power Locks. Front Doors Must Roll Windows Down Use Hand To Open Thanks. Ms. J. C.


Door Lock and Unlock Operation
When a door lock switch is activated in the lock or unlock position the BCM will receive a voltage signal on either the door lock switch lock or unlock signal circuits.
The BCM, upon receipt of a lock switch lock or unlock signal, will switch the appropriate lock relay control circuit(s) to battery positive voltage. This will energize the appropriate lock or unlock relay(s). The relay will supply voltage to the door lock actuator lock or unlock control circuits to one side of the lock actuator. Since the opposing side of the lock actuators are connected to ground through the other lock actuator control circuit and the normally closed contacts of the lock or unlock relay, the doors and liftgate will then lock or unlock appropriately.
Three relays are used to operate the lock. Driver door unlock, passenger door unlock and all door lock. This is done to isolate the driver door lock actuator so it can be unlocked by itself using the keyless entry transmitter.
Your door locks are controlled by the BCM - body control module (a computer ) . An a scan tool is a must to diagnose system operation . Your best bet would be to take your vehicle to a qualified repair shop . The only way you could try to fix this is by changing parts ! Suppose you find an replace a door lock/ unlock relay an that doesn't fix it ? There could be DTC'S stored in the BCM . Do you know what a DTC is ?
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DTC B3132 All Door Unlock Circuit Low


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DTC B3133 All Door Unlock Circuit High




Your

Aug 10, 2016 | Cars & Trucks

1 Answer

2008 Chevy Impala LTZ: car wont lock or unlock with the power lock/unlock buttons on the remote or car door. It makes a clicking sound though when I attempt to. Is this a blown fuse? Or something else


Where do you here the clicking sound ? in the door , behind instrument panel ? I don't think a blown fuse would do this , possibly a relay ! do you know what a relay is ? This is Chevy factory service information !
Door Lock Operation
When the body control module (BCM) detects a transition of either of the door lock switches to the lock position, it switches the door lock actuator lock control circuit to voltage. Since the lock actuator unlock control circuits are at ground potential within the BCM, the door lock actuator motors transition to the lock position.
There are three pcb relays integrated into the instrument panel fuse box ( non replaceable ) door unlock pcb relay drivers door -door unlock pcb relay an door lock pcb relay ! The BCM controls these relays ! Do you know what a BCM is ?
Circuit/System Description
The DR/LCK fuse supplies battery positive voltage to the I/P fuse block for the door lock system. The body control module (BCM) supplies and monitors a reference voltage to the door lock switch through the door lock switch lock/unlock signal circuit. The door lock switch also receives a constant ground source. If a door lock switch is placed in the lock position or unlock position, the reference voltage is taken directly to ground and the BCM detects the voltage drop on the signal circuit.
The BCM, upon receipt of a door lock switch lock or unlock signal, will switch the appropriate door lock actuator control circuits to battery positive voltage. The opposing side of the door lock actuators are connected to ground internally within the BCM through the other door lock actuator control circuit and the doors will lock or unlock appropriately.
With out have a factory GM tech 2 scan tool ,It would be best if you took this to a Chevy dealer . The first part of diagnosing this problem is to hook up a scan tool !

Wiht
There
How to test computer controlled door locks

Aug 25, 2015 | Cars & Trucks

1 Answer

Door lock dont always work


What door lock doesn't always work ? One or all of them . This is a complex set up for these door locks ! The switch is an input to the BCM - body control module . There is logic involved in the microprocessor , there are relays built in to the BCM ! Could have a DTC - diagnostic trouble code stored in the BCM ! Could be a bad connection at the BCM or master window switch ! A bad ground !
The power door lock system consists of the following components:
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Body control module (BCM)


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DOOR LKS fuse


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Driver door lock actuator


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Driver door lock switch


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GMLAN serial data link


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Keyless entry transmitter


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Passenger door lock actuator


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Passenger door lock switch


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Remote control door lock receiver (RCDLR)


The DR LCK fuse supplies battery voltage to the body control module (BCM) for the power door lock system. The BCM supplies and monitors a reference voltage to the driver and passenger door lock switches through the door lock switch lock/unlock signal circuit. Each door lock switch receives ground at G300 which is also the ground for the door lock and unlock relays located in the BCM. When a door lock switch is placed in the lock position, the reference voltage is switched to ground and the BCM senses 0.0 volts on the door lock/unlock signal circuit. When a door lock switch is placed in the unlock position, the reference voltage is switched to ground through a 1.5k ohm resistor that is internal to each of the door lock switches and the BCM senses approximately 2.9 volts on the door lock/unlock signal circuit. The BCM interprets what position the activated door lock switch was placed in based on the voltage drop.
The BCM, upon receipt of a lock or unlock switch signal, will switch the appropriate door lock/unlock relay coil control circuit to ground causing the appropriate door lock/unlock relay to energize. With the relay energized, voltage is applied to the door lock actuator control circuit causing the door to either lock, or unlock depending on what command was received from the power door lock switch or remote control door lock receiver (RCDLR). When a power door lock/unlock relay is not energized, the switch contacts are normally grounded through the BCM which provides ground to the appropriate door lock actuator for the lock/unlock function being performed. The power door lock/unlock functions are performed by reversing the flow of voltage through the door lock actuator control circuits. The BCM has three internal drivers for the power door lock system. Driver door unlock, passenger door unlock and all door lock. This is done to isolate the driver door lock actuator so it can be unlocked separately from the passenger door. For additional information concerning keyless entry, refer to Keyless Entry System Description and Operation.
This is one you may want to take to dealer or some other ASE certified repair shop ! To do this right you need a Tech 2 scan tool !
Ignition ON, observe the scan tool Door Lock Switch parameter while using the driver and passenger door lock switches. The parameter should change from Idle to Lock and Unlock.
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If the value does not change, refer to Door Lock Switch Malfunction.

Command the doors to LOCK and UNLOCK with the scan tool, the door lock actuators should LOCK and UNLOCK when changing between the commanded states.
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If one or more doors do not LOCK or UNLOCK, refer to Door Lock Malfunction.

Aug 12, 2015 | 2009 Pontiac Solstice Convertible

1 Answer

07grandprix my door locks are all actin up sometimes they work & sometimes they dont I can set the alarm even tho they wont lock & the alarm goes off if u open the door but won't lock with the key/pad


The Power Door Lock System is controlled by the body control module (BCM) and can be activated by any one of the following
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A door lock switch lock or unlock actuation.


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A door lock cylinder switch unlock actuation.


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A keyless entry transmitter actuation.


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An automatic door lock actuation (Personalization function).


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An automatic door unlock actuation (Personalization function).


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A last door closed locking (LDCL) actuation (Personalization function).


Door Lock Operation
When the body control module (BCM) detects a transition of either of the door lock switches to the lock position, it switches the door lock actuator lock control circuit to voltage. Since the lock actuator unlock control circuits are at ground potential within the BCM, the door lock actuator motors transition to the lock position.
Driver Door Unlock Operation
When the body control module (BCM) detects a transition of either of the door lock switches to the unlock position, it switches the driver door lock actuator unlock control circuit to voltage. Since the door lock actuator lock control circuit is at ground potential within the BCM, the left front (LF) door lock actuator motor transitions to the Unlock position.
The driver door lock actuator unlock control circuit is a dedicated control circuit used only for the driver door lock actuator motor. This is done so that the driver door may be unlocked by itself using a keyless entry transmitter or an automatic door unlock function (if programmed).
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections.
A factory scan tool would help for checking inputs from the door switches to the BCM ! You could do it with out scan tool , a lot more work involved ! Need a wiring diagram an a component location chart an wiring harness routing diagram !
Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items:
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Wiring broken inside the insulation


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Poor connection between the male and female terminal at a connector


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Poor terminal to wire connection--Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc.


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Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits.


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Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle.


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Wiring that comes in contact with hot or exhaust components


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Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern.


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Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions.


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Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation.


You should take it to a ASE certified repair shop if not familiar with Automotive electronics !

Jul 14, 2015 | Cars & Trucks

1 Answer

2006 Dodge Stratus, driver side door lock actuator not getting power. Replaced actuator didn't work. Need location of the relay wiring to try that next?


Nick:
I would not go and fix the relays: those are inside the BCM or "Body Control Module" located under the dashboard to the extreme left or driver's side. Believe me, it is a nightmare to remove from the car and very expensive to repair at specialist shops.
In my 2002 Stratus Sedan R/T Turbo (Mexico), the door locks started to ignore the door switches or the remote at about two years from new, but as it was an intermittent failure, I didn't go to the dealer to fix it under warranty. But after two more years and just out of warranty, the failure was more frequent. After six years of use, all the doors were ignoring the commands from either the door mounted switches or the remote.

The thing is, "modern" cars are designed with too much reliance on software and computerized modules to perform simple tasks previoulsly done with simple wiring and relays. This is the case with the door lock actuated by a BCM. In the older Spirit, LeBaron, Reliant etc. generation designs, you had three wires to the small motor actuating the door lock mechanism. But some "too-intelligent" so called automotive designers decided a "better idea": to multiplex the lock/unlock commands on only two wires, "saving" a few feet of copper wires, but requiring the use of a complex Module, that ends up being much more costlier, heavier and unreliable! (but in that way the too-intelligent software (ab)using designers were happy).

I solved my problem by disconnecting the door locks wiring to the BCM and paid a much lower price to a technician that installs cheap car alarms that have their own remote control. In that way i saved about $350 USD... you decide what to do! Best Luck, Amclaussen.

Apr 05, 2014 | 2006 Dodge Stratus

1 Answer

L door dose not lock all door locks


This may be due to a bad lock actuator, i will need to ask a few questions first.Can you lock the door by hand using the button? or is the lever stuck?Is the problem that it does not work with the power locks only?
Let me try to answer these, first if the door lock does not work with the power locks then the door lock actuator may be bad, the door panel will need to be removed and test for power at actuator. While inside the door check lock linkage.If the door lock lever wont move then that may also be related to a frozen lock actuator, that is the same as above. a bad or frozen lock actuator will not allow door to lock or unlock but sometimes a bad actuator will not work with the power button but will allow you to lock and unlock with lock lever or door key, the door panel needs to be removed to check . good day.

Apr 29, 2012 | 2000 Hyundai Sonata

1 Answer

I have a 99 gmc suburban that has a issue with the rear cargo door not locking or unlocking. The other doors work fine but not the rears doors ? The cargo door lock switch in the rear works and powers...


be sure all mechanical parts of lock are lubed and free to move lock catches could be to close to each other making it to hard for the actuator to pull

Feb 27, 2011 | GMC Suburban Cars & Trucks

1 Answer

Door locked can not unlock or open door pass door


This is very common. what happens is the power door lock actuator freezes up and doesnt allow the linkage to move, you may have to use pliers to pull on the lever or remove the door panel to get inside the door and dissconnect the linkage from the actuator, then you will be able to unlock or lock with the key or lever its just the power lock wont work unless you replace the actuator, heres a picture of it and it located next to the latch on the door,e72fa1d.jpg

Oct 29, 2010 | 1990 Ford F150

1 Answer

2006 Tahoe Z71 Lift Gate Will Not Unlock With Remote


Take the liftgate inside panel off an check the wiring , connections etc....
rear door hatch lock repair GMC Chevrolet
chevy tahoe lift gate not opening
The liftgate will lock any time the vehicle is shifted out of park on vehicles equipped with an automatic transmission and at vehicle speeds exceeding 5 kph with manual transmission. This happens in conjunction with auto door locks if enabled or independently of auto door locks if the feature is disabled. This ensures that the liftgate is locked anytime the vehicle is shifted out of park or when the vehicle is in motion.
The liftgate lock relay supply and coil sides receive a constant voltage through the battery voltage supply circuit and the ECC fuse. The normally closed contact is connected to ground and the control side is connected to the body control module (BCM). A lock function will occur when a door lock switch activation, keyless entry lock transmission, auto door lock function or a liftgate lock function has been received by the BCM. The BCM will then ground the control side of the liftgate lock relay. This energizes the relay and allows voltage to be applied to the liftgate lock actuator lock control circuit. Since the other side of the liftgate lock actuator is connected to the normally closed contacts of the door unlock relay to ground, the liftgate will lock. When an unlock function occurs the BCM will ground the control side of the unlock relay and the rear doors and liftgate will unlock.
The BCM also runs diagnostics on the liftgate lock relay control circuit and will set DTC B3825 as current and also send a Class 2 message to the DIC. The DIC will display REPLACE LIFTGATE FUSE to inform the driver that a fault has been detected in the liftgate lock circuit and that the liftgate is not locked. Faults that will set the DTC and cause the DIC to display the message could be any of the following

Power Door Locks Inoperative - Endgate/Liftgate

Schematic Reference: Door Lock/Indicator Schematics
Connector End View Reference: Power Door Systems Connector End Views
1
Did you perform the Diagnostic System Check - Vehicle?
YES - Go to Step 2
NO - Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
Activate the door lock switches to the lock and unlock positions.
Do both rear passenger doors lock and unlock?
YES - Go to Step 3
NO - Go to Power Door Locks Inoperative
3
Did the liftgate lock actuator lock and unlock?
YES - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
NO - Go to Step 4
4
Disconnect liftgate door lock actuator.
With a test lamp connected to a good ground, probe the door lock actuator lock circuit at the door lock actuator harness connector.
Activate a door lock switch to lock position.
Does the test lamp illuminate?
YES - Go to Step 5
NO - Go to Step 7
5
With a test lamp connected to a good ground, probe the door lock actuator unlock circuit at the door lock actuator harness connector.
Activate a door lock switch to unlock position.
Does the test lamp illuminate?
YES - Go to Step 6
NO - Go to Step 8
6
Inspect for poor connections at the harness connector of the door lock actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
YES - Go to Step 10
NO .. Go to Step 9
7
Repair the open door lock actuator lock circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
YES - Go to Step 10
--
8
Repair the open in the door lock actuator unlock circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 10
--
9
Replace the liftgate door lock actuator. Refer to Door Lock Actuator Replacement in Body Rear End.
Did you complete the repair?
Go to Step 10
--
10
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 2

Apr 27, 2017 | 2006 Chevrolet Tahoe

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