P21-1049-1202 | Genuine Paccar® Door Control Switch Module

Description: A Door Control Switch (DCS) P21-1049-1202 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 trucks (especially T680, T880, W990), Peterbilt 579, 579, 589. Part Number: P21-1049-1202 Condition: New Manufacture/Brand: Paccar Fits P21-1049-1202 For heavy-duty trucks, including:   Kenworth T680 Kenworth T880 Kenworth W990 Peterbilt 567 Peterbilt 579 Peterbilt 589 Purpose of using P21-1049-1202:  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 P21-1049-1202:    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 About the Manufacturer – Paccar: PACCAR Inc is a global technology leader in the design, manufacture, and customer support of premium light-, medium-, and heavy-duty trucks. Founded in 1905 and headquartered in Bellevue, Washington, PACCAR is best known for its world-class truck brands: Kenworth, Peterbilt, and DAF. PACCAR’s trucks are recognized for their durability, fuel efficiency, advanced engineering, and driver-focused technology. In addition to truck manufacturing, PACCAR also designs and builds diesel engines, and provides financial services, information technology, and aftermarket support to its global customer base.