Power Door Lock on driver side front door

Tiny
TSHUMP18
  • MEMBER
  • 2008 HYUNDAI ELANTRA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 112,000 MILES
I believe I have brought this up in the past, but I'll start anew :)

So, I've been reviving this car little by little. Had a parasitic draw, found that and took care and remedied that issue. Now onto a couple others.

This here is interesting and not sure what it could be. Had a shop look at it and they said "bad master switch." Well, I bought a new master switch and it did exactly the same thing.

Here goes with the issue. On the driver side front door you have the obvious buttons for putting the front and back windows up and down, maneuvering the door mirrors, etc. Then you have the lock portion. Again, like any normal power everything vehicle. You have the button. One end locks, the other unlocks. Again, sounds very moot. The issue is that when you hit the unlock button everything works perfectly, unlocks all doors. All good. But when you hit the lock portion. Nothing. It's like it is turned off. While I was doing my draw testing I decided to test that as well. Any time you hit anything or turn anything on the amps go up. Naturally. However, when I hit the lock portion. Nothing. Stays 0.00. So there is absolutely no power going to that lock portion at all. Again, seems like it's "turned off."

Wondering if there are any suggestions. I tried getting a new master switch, still got the same result. Also got a new solenoid/actuator. Again, same thing. However, that doesn't mean I didn't do something incorrectly.

Let me hear it!

Not a huge deal right now since I can just reach over to the passenger door and lock the doors using that.

Oooo, before I forget, I actually CAN get it to work with some manipulation. When the car is OFF and I manually lock the drivers front door and THEN hit the lock portion. Bam, it locks all the other doors!

Can't wait to hear what people think on this :)
Thursday, July 2nd, 2020 AT 11:06 AM

14 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Hi,

If the actuator, switch, and relay is new, then we need to go to the body control module. Can you tell me if the locks work properly from a different switch in the car? Do they work with the fob?

If you look at pic 1, it shows the lock relays. I just want to confirm you got the correct one. Next, pic 2 shows power to the relay from the fuse. Confirm there is power to the lock relay.

Next, if there if there is power, then you need to check the body control module for a signal. See pic 3. You will need a helper when checking to actuate the lock button.

Let me know what you find.

Joe
Was this
answer
helpful?
Yes
No
Thursday, July 2nd, 2020 AT 7:32 PM
Tiny
TSHUMP18
  • MEMBER
  • 28 POSTS
Yep, all other locks in the car work. Well, guess there is only one other power lock button and that's the passenger side, and it works perfectly. Also, the fob (and the backup fob) work as well.

I'll do my best with the diagrams. I don't do too well with those. :) How shall I test power to the lock relay?

I see it says behind center of dash for the BCM. Probably going to need to pry a bunch of things apart, eh?
Was this
answer
helpful?
Yes
No
Thursday, July 2nd, 2020 AT 9:24 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
As far as testing for power to the relay, first, confirm the fuse is good and has power both in and out.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If there is, then remove the relay and check for power from the red wire in (I believe it's pin 13). You can use a test light for that.

The body control module can be difficult to work on simply due to a lack of room. If you plan to unplug the connectors to it, make sure the car battery is disconnected first. Also, when you plug it back in, the battery should also be disconnected.

Joe
Was this
answer
helpful?
Yes
No
Friday, July 3rd, 2020 AT 10:43 PM
Tiny
TSHUMP18
  • MEMBER
  • 28 POSTS
Starting to feel like it’s the lock relay. Everything seems good from what I can tell. Any good suggestion on where to purchase a door lock relay for this car?
Was this
answer
helpful?
Yes
No
Sunday, July 5th, 2020 AT 5:49 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
You should be able to get one just about anywhere. Here are directions for testing the circuit. Also, the pics attached correlate with the directions. The last thing at the bottom of the post I will add is link that explains how to test a relay.

_______________________________

2008 Hyundai Elantra L4-2.0L
Component Tests and General Diagnostics
Vehicle Body and Frame Relays and Modules - Body and Frame Power Door Lock Relay Testing and Inspection Component Tests and General Diagnostics
COMPONENT TESTS AND GENERAL DIAGNOSTICS
POWER DOOR LOCK RELAY

INSPECTION

DOOR LOCK
1. Disconnect the negative (-) battery terminal.
2. Remove the ICM relay box.
3. Check for continuity between the terminals.
4. There should be continuity between the No. 5 terminal and No. 14 terminals in the ICM-B when power and ground are connected to the No. 11 terminal and No. 13 terminal in the ICM-B.
5. There should be no continuity between the No. 5 terminal and No. 14 terminal in the I/P-D when power is disconnected.

pic 1

DOOR UNLOCK
1. Disconnect the negative (-) battery terminal.
2. Remove the ICM relay box.
3. Check for continuity between the terminals.
4. There should be continuity between the No.4 terminal and No.14 terminal in the ICM-B when power and ground are connected to the No.10 terminal and No.13 terminal in the ICM-B.
5. There should be no continuity between the No.4 terminal and No.14 terminal in the ICM-B when power is disconnected.

pic 2

________________________________________________

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Let me know if this helps and what you find.

Take care,
Joe
Was this
answer
helpful?
Yes
No
Sunday, July 5th, 2020 AT 8:54 PM
Tiny
TSHUMP18
  • MEMBER
  • 28 POSTS
I do have one other question and/or finding. So, I can get the door lock button to work on the driver door (the passenger door lock button works just fine).

What I have to do and this is only with the car completely off (which ultimately, that defeats the purpose, when do you lock the doors when you're in the car and it's off!). What I do is sit in the car while off and then hit unlock, then manually lock the door (just simply thumb the lock to the lock position) and then hit lock. Boom, it locks all the other doors and you can hear the actuator firing. Also, if I unlock just the driver door and leave the other doors locked and then hit the lock button, it locks the driver door.

I am just trying the process of elimination. I still feel it's the relay, but thought i'd bring that to light. But my skeptical feeling about the relay comes from the fact it works on the passenger side. Could it just be a partially faulty relay then? I'm hoping so, but not holding my breath.

As a caveat, I did have this door replaced about a year ago and wondering if then the shop messed up the wiring. But my skepticism with that is the fact that everything else on the master power door switch works (windows, unlock function, mirror. Everything but the lock button). Since the unlock and lock are on different relays, that's what makes me think relay. I was thinking of testing this by taking the passenger side switch and plug it into the driver side (doesn't have all the window switches, naturally, but has the lock) and see if that works, then maybe it's a faulty switch. But then with that, I got a new switch a while back and it did exactly the same thing it does now which lead me to believe it's not a bad switch, so I returned it. But maybe I just some how got another bad switch (chances low, eh?).I did get one on the cheap (bought for $50 but see others over $100 that may be better). I don't know, it's not really a huge huge deal, it's more a nuisance. The fob works, the key in the door works, and again, the passenger door lock function works. It's more of wanting everything to work on the car in case we decide to ever trade-in or sell it.

I'll see what you come up with. I may just go get a new relay since it's inexpensive and pop it in and see what I get. Nothing to lose there from my point of view. Also, thought it was a bad actuator. But (tons of buts here, I know) I bought a brand new actuator as well and put that in and again, same result.

Can't wait to hear what you have to say and probably hear the head scratching from here (Minnesota) :)
Was this
answer
helpful?
Yes
No
Wednesday, July 8th, 2020 AT 7:19 AM
Tiny
TSHUMP18
  • MEMBER
  • 28 POSTS
Maybe I am looking at this all wrong. I am thinking the relay as in the little box that looks like a plug (4 or 5 prong plug) is that correct? And, maybe I am looking in completely the wrong location. I am focusing under the dash (left side) under the steering wheel near the fuse box (which the box opens toward the outside of the car and would imagine the relays would be behind it).

Seems like I need to locate the ICM relay box?
Was this
answer
helpful?
Yes
No
Wednesday, July 8th, 2020 AT 2:48 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Hi,

I am scratching my head but have to be careful. There isn't too much left up there to lose. LOL

I agree with everything you said. If the new switch was bad, would it do the exact same thing? As far as the ICM relay box, I attached a pic to help you locate it.

Let me know if this helps.

Joe
Was this
answer
helpful?
Yes
No
Wednesday, July 8th, 2020 AT 9:42 PM
Tiny
TSHUMP18
  • MEMBER
  • 28 POSTS
And that ICM is going to have the pronged relay box/plug? Sorry, just wrapping my head around things.
Was this
answer
helpful?
Yes
No
Wednesday, July 8th, 2020 AT 9:52 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Hi,

The ICM is an integrated control module. That is replaced as a unit. I believe you are picturing the traditional type relays. This is different.
Was this
answer
helpful?
Yes
No
Wednesday, July 8th, 2020 AT 10:07 PM
Tiny
TSHUMP18
  • MEMBER
  • 28 POSTS
Sounds good. Do you have a picture of what the relay looks like? In case I go to the store and don’t look like a complete idiot.
Was this
answer
helpful?
Yes
No
Wednesday, July 8th, 2020 AT 10:16 PM
Tiny
TSHUMP18
  • MEMBER
  • 28 POSTS
So, I am probably getting really annoying. But would clarify that I was looking for a pic that is "live". A color picture of what it looks like in reality. I've been trying to find it online and not seeing anything that specifically says "door lock relay" or something of that nature. But also realized, the pic you provided with Connector A and Connector B. That's the relay right there :) I think your last schematic pic of the boxes as well (with #1 circled) will help. Thank you. I need to go back where I was originally.
Was this
answer
helpful?
Yes
No
Thursday, July 9th, 2020 AT 11:13 AM
Tiny
TSHUMP18
  • MEMBER
  • 28 POSTS
Well no, it does make sense, but how do I get to it?
Was this
answer
helpful?
Yes
No
Thursday, July 9th, 2020 AT 2:35 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Hi,

It's under the dash to the left of the left of the steering column. Take a look at the attached pic. Also, by no means are you being annoying. LOL This is why I'm here.

Joe
Was this
answer
helpful?
Yes
No
Thursday, July 9th, 2020 AT 9:54 PM

Please login or register to post a reply.

Sponsored links