DESCRIPTION
| WARNING | Vehicle is equipped with an air bag restraint system. For additional information on air bag restraint system and before attempting any repairs involving instrument panel, steering column or related components, see appropriate AIR BAG RESTRAINT SYSTEMS article. |
The body control computer system consists of a combination of modules that communicate over the Programmable Communication Interface (PCI) multiplex system (bus). Through the PCI 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.
Diagnostic Trouble Codes (DTC) are accessed through a 16-pin Data Link Connector (DLC) using Chrysler Diagnostic Readout Box (DRBIII(R)) scan tool or generic scan tool. DLC is located under left side of instrument panel, above brake pedal.
Modules (if equipped) that are connected to the PCI bus are as follows.
- Air Bag Control Module (ACM)/Occupant Restraint Controller (ORC)
- Anti-Lock Brake System (ABS) Control Module/Controller Anti-Lock Brake (CAB)
- Automatic Temperature Control (ATC) Module
- Body Control Module (BCM)
- Mechanical Instrument Cluster (MIC)
- Left And Right Side Impact Air Bag Control Modules (SIACM)
- Memory Heat Seat/Mirror Module (MHSMM )
- Overhead Travel Information System (OTIS)
- Powertrain Control Module (PCM)
- Radio/CD Player
- Sentry Key Immobilizer Module (SKIM)
- Transmission Control Module (TCM)
The Body Control Module (BCM) is mounted to junction block. Junction block is located behind left end cap of instrument panel. BCM supplies vehicle occupants with various visual and audible information, and controls various vehicle functions.
BCM has several customer programmable features which can be enabled or disabled. These features are rolling door locks, remote keyless entry horn chirp and remote keyless entry rear release toggle.
Wiper Erratic Operation In Intermittent Speeds
Note. After making any repairs, perform BODY CONTROL MODULES SYSTEM VERIFICATION TEST under VERIFICATION TESTS.
- Turn ignition off. Remove wiper on/off relay from Power Distribution Center (PDC). see scheme 23 Substitute a known-good wiper on/off relay. Turn ignition on. Turn wipers on. If wipers operate properly, turn ignition off, and replace wiper on/off relay. If wipers do not operate properly, turn ignition off, install original wiper on/off relay, and go to next step.
- Disconnect Body Control Module (BCM) connector C3. Disconnect wiper motor connector. Measure resistance of wiper park switch sense circuit (Tan/Red wire) between BCM connector C3 terminal No. 3 and wiper motor connector terminal 4. see scheme 6and see scheme 49. If resistance is less than 5 ohms, leave connector disconnected, and go to next step. If resistance is 5 ohms or more, repair open in Tan/Red wire.
- Measure resistance between ground and BCM C3 connector terminal No. 3, wiper park switch sense circuit (Tan/Red wire). If resistance is less than 100 ohms, repair short to ground in Tan/Red wire. If resistance is 100 ohms or more, leave wiper motor connector disconnected, and go to next step.
- Ensure BCM connectors are properly connected. Connect scan tool to Data Link Connector (DLC). Monitor WIPER PARK SWITCH status while momentarily connecting a fused jumper wire between ground and wiper motor connector terminal No. 4, wiper park switch sense circuit (Tan/Red wire). If WIPER PARK SWITCH status changes when jumper wire is connected, replace wiper motor. If WIPER PARK SWITCH status does not change when jumper wire is connected, replace BCM.
