Door lock voltage issue
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Laughing Gas
Joined: Mar 2007
Posts: 898
Likes: 23
From: Tucson
Door lock voltage issue
Hey everyone. Over the past couple of months my passenger door lock hasn't been working properly. I've preformed the door lock fix with the aluminum foil 6 or 7 years ago and tried it again recently thinking that may be the problem. No such luck.
I bought new actuators and replaced the passenger side one and same problem still. I then checked the voltage coming from the switch. Drivers door on lock and unlock sends 11.5V to the actuator. Passenger door on luck and unlock only sends 1.5V to the actuator. Where do I go from here? I've read something about door lock relays but no one seems to know where they're located. Any help is greatly appreciated!
I bought new actuators and replaced the passenger side one and same problem still. I then checked the voltage coming from the switch. Drivers door on lock and unlock sends 11.5V to the actuator. Passenger door on luck and unlock only sends 1.5V to the actuator. Where do I go from here? I've read something about door lock relays but no one seems to know where they're located. Any help is greatly appreciated!
Posting Guru
Joined: Oct 2012
Posts: 1,910
Likes: 2
From: Hat Creek Ca
I don't have a schematic available to see what's what but it could just be a bad connection somewhere in the feed to the switch.
Did you but OEM actuators? Will they work on the bench with a test battery?
Did you but OEM actuators? Will they work on the bench with a test battery?
Fleet Mechanic
Joined: Nov 2010
Posts: 1,408
Likes: 249
From: Ringgold, Ga
Todd you need to pull the radio in order to get to the relays.
There behind and between climate control and radio on the firewall.
I used my key fob while reaching in and touching relay while lock and unlocking. You can here them with engine off.
Pretty sure if other doors are working the relay may be good. If anything mark them and then switch them around. See if volatage follows the relay.
If I remember right its 3 relays. Lock, Unlock, Horn and thinking about maybe 1 for the Parking lights flash.
If truck has keylessentry the lights blink and horn toots when double clicking lock on remote
There behind and between climate control and radio on the firewall.
I used my key fob while reaching in and touching relay while lock and unlocking. You can here them with engine off.
Pretty sure if other doors are working the relay may be good. If anything mark them and then switch them around. See if volatage follows the relay.
If I remember right its 3 relays. Lock, Unlock, Horn and thinking about maybe 1 for the Parking lights flash.
If truck has keylessentry the lights blink and horn toots when double clicking lock on remote
Thread Starter
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Laughing Gas
Joined: Mar 2007
Posts: 898
Likes: 23
From: Tucson
I searched everywhere, even behind the radio and didn't find any relays. According the Haynes manual our trucks either came with them (and RKE) and or didn't. I'm guessing mine was one that didn't. I pulled the old actuators back out, cleaned them up really good, added new foil and reinstalled. Seem to be working fine for whatever reason so I'm good with that. Thanks for all the help!
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 26
From: Mesa AZ
I searched everywhere, even behind the radio and didn't find any relays. According the Haynes manual our trucks either came with them (and RKE) and or didn't. I'm guessing mine was one that didn't. I pulled the old actuators back out, cleaned them up really good, added new foil and reinstalled. Seem to be working fine for whatever reason so I'm good with that. Thanks for all the help!
You are correct. The relays only occur on the RKE models. Here are the wiring diagrams in case you have the need later.
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Laughing Gas
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