Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Engine Controls - Tests W/Codes - Body Control Computer: Description
The body control computer system, also referred to as the Body Control Module (BCM) system, consists of a combination of modules that communicate over the Chrysler Collision Detection (CCD) BUS system. Through the CCD BUS, information related to the operation of vehicle components and circuits is relayed to the appropriate system module(s). Each module receives the same component information. This reduces the complexity of vehicle wiring and size of wiring harness.
The following BCM systems are covered in this article: electronic instrument cluster, electro/mechanical instrument cluster, compass/mini-trip module, power door locks, Remote Keyless Entry (RKE), side door memory lock, windshield wiper, illuminated entry, courtesy lights, key-in light system, headlight time delay, liftgate release, seat belt warning light system and chimes. System failures within these systems can be diagnosed via the CCD BUS Data Link Connector (DLC) using Chrysler Diagnostic Readout Box (DRB) tester.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.