2004 Chevy Tahoe Rear Auto Door Locks and Hatch Lock does not work. I changed the Power Door Lock Relay in the fuse box and it did NOT fix the problem. They do not work with the remote and with the driver control panel. Any Ideas? Is there another fuse or relay I should look for?

Look at the end of the dash and between the drivers side door for a second fuse panel. I think everything you mention works on one data bus. You can remove the button pad on the drivers door. Since it gets used all th3 time i# might have gone bad messing up the works.

bought it like this.
so fob buttons work, but not hatch.
but lock inside locks fail (elect. buttons)
driver and shotguns side both fail, lock sw?
ext, mirrors dead.
door looks in the service manual has 5 pages of schematics, is well advised to read that first
not scanning the PCM/BCM first is never good.
oK if the speed sensor on the car fails, doors will act up. (for sure if it see car moving and is not)
the radio receiver (fob) works mostly
Fuse MIR /LKS must not be blown door buttons fail
why not check all fuses, save work and not need books to fix it if a fuse blew.?(underhood box)
IP fuse PWR/LKS not blown
the BCM runs the 3 Door lock relays
possibles
Fuse MIR /LKS blown 3amps
this kill local door power to LF and RF door swithes dead. and Rear glass to. the relay board does not fail with fobs. is the key fact.
your post is not clear on all for doors.
or LF an RF door switches. but assumed both are dead, me.
so it is just blown fuse.
we always check fuse first. a 20 cent part.

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Power Door Locks Circuit Description
The power door lock system incorporates door lock switches on both front doors and on the RH D-pillar, door lock motors in all passenger doors and in the RR cargo door, a door lock relay and a door lock control module.
Power for the door lock switches and the door lock control module is supplied from the CIG LTR fuse 13 through CKT 640 (ORN). Power for the door lock relay is supplied from the PWR ACCY circuit breaker through CKT 540 (ORN). Ground for the door lock relay is supplied from G202 through CKT 150 (BLK) and ground for the door lock control module is supplied from G400 through CKT 150 (BLK).
The door lock motors are reversible and both sides are connected to the normally closed contacts of the door lock relay. Those contacts of the relay are connected to G202. When any of the door lock switches are placed in the lock position, voltage is supplied through CKT 195 (LT BLU) to the relay lock coil. Since the other side of the lock coil is connected to ground, the coil is energized and it pulls the lock contacts closed. Voltage is then supplied through CKT 295 (GRY) to all the door lock motors and the doors lock. The unlock function operates in much the same manner except that when any of the switches are placed in the unlock position, voltage is supplied through CKT 194 (WHT) to the unlock coil of the relay and CKT 294 (TAN) supplies voltage to the apposite side of the door lock motor and the doors unlock.
Door Lock Control Module Description
The door lock control module is used on vehicles equipped with cargo doors. The purpose of the module is to lock the cargo doors after a lock cycle has been commanded from any of the door lock switches with the cargo doors open. When the RH cargo door is open, the module receives a ground signal from the closed contacts of the rear door jamb switch on CKT 1897 (ORN/BLK) to G400. When a lock command is received, the module retains this input until it receives an open input from the rear door jamb switch. Then the module sends a lock command through CKT 194 (WHT) to the door lock relay and the doors lock.
Rear Cargo Doors Description
The power door lock motor will not operate unless the rear cargo doors are fully closed. The power door lock motor is in the right cargo door. The contactors are on the rear cargo door opening on the body and on the right cargo door.

Ok, heres the fix, 3 amp fuse marked windows / locks in the underhood fuse box. Changed it out and everything works again. Hope this helps you.

The door locks on my 1999 tahoe stopped working and I checked the fuse, which was fine. The problem turned out to be that the fuse for my cigarette lighter was bad and for some reason it also must be working in order for the door locks to work. Put in a new cigarette lighter fuse and the door locks worked again!

Doesn't lock or unlock ? These relay's are controlled by the BCM - body control module .
I have factory service repair information , 32 steps ! Too much info to post here .

Power Door Locks Inoperative (Rear Door(s))
2
Activate the door lock switches to the lock and unlock positions.
Do both rear passenger doors lock and unlock?
YES - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
NO - Go to Step 3
3
Is there only one door lock actuator that is inoperative?
YES - Go to Step 6
NO - Go to Step 4
4
Are the rear door lock actuators inoperative for both lock and unlock?
YES - Go to Step 8
NO - Go to Step 5
5
Do the rear door lock actuators lock?
YES - Go to Step 15
No - Go to Step 10
6
Disconnect the inoperative 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 7
NO - Go to Step 25

Some of these steps can be bypassed because you say they worked after replacing the relay .LOCK RELAY ? right .

7
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 24
NO - Go to Step 26
8
Remove the rear door unlock relay.
Connect a test lamp to battery positive voltage.
Probe the door actuator unlock control circuit cavity in the left IP fuse block.
Does the test lamp illuminate?
YES - Go to Step 21
NO - Go to Step 9
9
Install the rear door unlock relay.
Remove the rear door lock relay.
Connect a test lamp to battery positive voltage.
Probe the door lock actuator lock control circuit cavity in the fuse block.
Does the test lamp illuminate?
YES - Go to Step 20
NO - Go to Step 22
10
Remove the rear door lock relay.
Connect a test lamp to a good ground.
Probe the battery positive voltage circuit (high current) cavity in the fuse block.
Does the test lamp illuminate?
YES - Go to Step 11
NO - Go to Step 22

If your not familiar with GM diagnostic flow chart's , they can be confusing .
Let me know if you need more diagnostic steps .

In the i/p fuse box there is 2 relays, a lock relay and an unlock relay. The relays should be the same. If the door lock actuators work in the lock position but not the unlock position try swapping the relays and see if the actuators will unlock the doors. You have a bad relay if this worked for you.

The only other part that is common to the circuits is the body control module. It controls the ground circuits to the lock relays. The control to the unlock side can be bad if the relay swap don't work.

Good luck

you have two relays on the interior fuse block one for locking and one for unlocking. Swap them and see if the problem is now such that they will not lock. If so you have your answer.

check the clamp sensor front and back door