NOTE: Self-diagnostic tests are written specifically for Chrysler's Diagnostic Readout Box (DRB) scan tool. A generic scan tool may not be capable of performing all necessary test functions.

The body control computer system consists of a combination of modules that either communicate over the Chrysler Collision Detection (CCD) bus system or Programmable Communication Interface (PCI) bus system. Through the CCD (Cherokee and Wrangler) or PCI (Grand Cherokee) bus, information related to the operation of vehicle components and circuits are relayed to the appropriate system module(s). This reduces the complexity of vehicle wiring and size of wiring harness.

Body control computer systems covered in BODY CONTROL COMPUTER TESTS articles are as follows:

Chime System (WJ Body)
Compass/Mini-Trip Computer (CMTC) (XJ and WJ Bodies)
Exterior Lighting (WJ Body)
Instrument Cluster (All)
Interior Lighting (WJ Body)
Power Door Locks (XJ and WJ Body)
Power Windows (WJ Body)
Sentry Key Immobilizer System (SKIS) (All)
Vehicle Theft Security System (VTSS) (All)
Wipers (WJ Body)

Body control computer fault messages are accessed through 16-pin Data Link Connector (DLC) using Chrysler's Diagnostic Readout Box (DRB) scan tool or generic scan tool. DLC is located on left side of steering column, above brake pedal. See Fig 1 .

Fig 1: Locating 16-Pin Data Link Connector

Courtesy of CHRYSLER CORP.

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.

Safety Warning

Body Control Computer - Introduction: Description

Use the Manual With the Right Hardware

When to See a Mechanic