There is a clicking sound where the rear seat buttons are& our battery is being drained.

That is one of the actuators in the rear HVAC unit. Sometimes the door that they drive gets stuck or the actuator itself goes bad. In the picture below #3 & #33 are the two actuators. Replacement of #3 is not an easy job.

Pure SWAG on my part, but the only 2 things I can think of on the back cab wall are the power slider motor ( if a rear power slider is installed ) or the VSM ( Vehicle Security Module, called a Body Security module on 04-05 MY ).

should not be clicking, maybe an issue with maybe the ground to the VSM ?

You would need to remove the seat back if it is a SuperCrew or SuperCab, to get to the VSM to check the ground, and if any of the pins are discolored in the connectors ( remove and check ):



These are the pictures from when I installed the heated seats in my SuperCrew
Where the screw driver goes into release the clip.

Close up of what you are shooting for when the seat is installed, the screw driver needs to go through that openeing to trigger the clip.


The trigger you need to press to release the seat back. Best once you get 1 side released, stick something under it so it does not click back into place, I used a 2x4 in a sock to slide between the seat back and bottom.

Sounds like a bad tailgate release switch

REMOVE OR DISCONNECT

1. Negative battery cable.
2. Drain cooling system.
3. Upper firewall weatherstrip.
4. Upper secondary cowl.
5. Heater hoses from core.

NOTE Blowing out residual coolant from inside the heater core will prevent coolant leakage into the passenger compartment when the heater core is removed.

1. Sound insulator.
2. Rear seat duct adapter.
3. Heater duct.
4. Heater core cover.
5. Heater core.

INSTALL OR CONNECT

1. Heater core.
2. Heater core cover.
3. Heater duct.
4. Rear seat duct adapter.
5. Sound Insulator.
6. Heater hoses to core.
7. Upper secondary cowl.
8. Upper firewall weatherstrip.
9. Fill cooling system and check for leaks.
10. Negative battery cable.

Sounds to me as if you may have a short in the speaker wires or they may not be hooked up at all. follow from back of stereo follow wires all the way to rear speakers making sure that they are not showing any bare spots.

it does sound like a bad battery just press in on the bottom of the seat where it meets the floor and it will pull up then you can get to the battery

Hello, You could have a central locking pump running all the time because you have a failure, (leak} in the system. It could be door lock actuators, trunk lock actuator or gas lid actuator or maybe a pump failure. It's located under the rear seat on the passenger side. You can pull the seat up and check to see if that is the problem.

If you find this information to be correct would you please enter a "fixya" rating.
Thanks, Gator241

there must be somekind of amp draw or else you shouldnt be having any problems,this may sound wierd,and also may be a bit of work,try disconnecting the alternator for a night and see if your problem goes away,ive run across this a couple of times,also,seat control modules are known to cause draw problems in c and clk classes