Rear door lock actuators not unlocking

[JTS197]

Hi all.

I have a 2008 Tahoe CBP that I am trying to figure out why the rear door locks will not unlock. I had the same problem with the front actuators. I replaced both of the front actuators and that works now. But for the rear, I replaced the rear passenger actuator and when I tested it, it still will not unlock. I have not replaced the rear driver actuator yet.

Question is if one of the rear actuators is not unlocking, will it affect the other? I wouldn't think it would but I am not sure where else to check.

I checked the "unlock" fuse on the driver's side fuse box and it looked ok.

Are there other things I can check?

Thanks,

JT

 

[CaptainAmerica1]

Spamming multiple posts won’t get your questions resolved any faster….

 

[JTS197]

Spamming multiple posts won’t get your questions resolved any faster….

Thanks - that was so helpful...

My other posts were in the "PPV/SSV" specific forums; I thought if it was in the general forum, more eyes would be on it and maybe more help.

If violates posting policies, please delete it then.

 

[mikez71]

Check 15A LCK1 and UNLCK1 fuses?

 

[CaptainAmerica1]

Thanks - that was so helpful...

My other posts were in the "PPV/SSV" specific forums; I thought if it was in the general forum, more eyes would be on it and maybe more help.

If violates posting policies, please delete it then.

FNGs…

 

[JTS197]

View attachment 415752

Check 15A LCK1 and UNLCK1 fuses?

Thanks. That helped clarify which fuses I needed to look at. I was looking at UNLCK2. But UNLCK1 looked ok.

 

[OR VietVet]

Fuses looking ok and being ok, can be different. Check them with a 12 volt test light and make sure of continuity. Also, check the wiring in any umbilical cords that feed thru door jam.

 

[petethepug]

FNGs…

For a moment we all were FNGs. No one attacked you for it did they? What gives? Hate to say it but the FNG behavior isn’t coming from the NG here. Down a notch.

Thanks @mikez71 for the info

 

[mikez71]

Any updates?

I think I remember a similar case where the owner had to replace the cluster fuse panel (which has the door relays built in?)