Description
Part Number: Q27-1048-1203
Condition: Brand New - These are LOOSE and UNBOXED and have some DUST on them from sitting in the warehouse. They came directly from Paccar and are GENUINE and BRAND NEW.
Manufacture/Brand: Paccar
ALTERNATE NUMBERS:
Q27-6081-1203, Q27-6081-1201, Q27-1048-1200, P21-1049-1202, Q27-6092-1202
DESCRIPTION:
A Door Control Switch (DCS) Q27-1048-1203 is an electronic control unit located in a vehicle door that manages all the switches and functions built into that door. Door Control Switch Module For modern Kenworth and Peterbilt Trucks
For heavy-duty trucks, including:
Kenworth T680
Kenworth T880
Kenworth W990
Peterbilt 567
Peterbilt 579
Peterbilt 589
Purpose of using Q27-1048-1200:
The door control switch is used to control:
Power windows → raise/lower glass
Door locks → lock/unlock doors
Side mirrors → adjust position (and sometimes fold)
Window lock → disable passenger window controls
Child safety features (in some vehicles)
Signs of a Bad Door Control Switch Q27-1048-1200:
1. Power windows stop working
Window won’t go up or down from one switch
Works from another door but not the main switch (common on driver side)
2. Door locks don’t respond
Pressing lock/unlock does nothing
Only some doors lock/unlock
Works with key fob but not from the door switch
3. Side mirrors won’t adjust
Mirror controls stop responding
Mirrors move only in certain directions or not at all
4. Intermittent operation
Works sometimes, then stops
You may need to press hard or repeatedly
5. Some buttons work, others don’t
Example: front windows work, rear windows don’t
Lock button works but mirror control doesn’t
6. No response at all
Entire switch panel is dead
No lights, no function (could also be wiring or fuse)
7. Burnt smell or heat (rare but serious)
Electrical failure inside the switch
May feel warm or smell like burnt plastic
