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.
Body Control Modules: Description: Notes
The body control computer system consists of a combination of modules that communicate over the Programmable Communication Interface (PCI) bus system. Through the PCI bus, information related to the operation of vehicle components and circuits is communicated. Each module uses information as necessary. This reduces the complexity of vehicle wiring and size of wiring harness.
Diagnostic Trouble Codes (DTC) are accessed through a 16-pin Data Link Connector (DLC) using Chrysler's Diagnostic Readout Box (DRBIII(R)) scan tool or generic scan tool. See Fig 1 .
Modules connected to the DLC through the PCI bus circuit are as follows:
- Air Bag Control Module (ACM)
- Electro-Mechanical Instrument Cluster (EMIC)
- Powertrain Control Module (PCM)
- Sentry Key Immobilizer Module (SKIM)
Use the Manual With the Right Hardware
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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.
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