3.8L BCM Tests W/Codes: Description

NOTE: For information on Engine Control Module (ECM) controlled systems, see 3.8L (3800 VIN [C]) ECM TESTS W/CODES.

Reatta, Riviera and Toronado models use several electronic components which can be controlled by the service technician to provide valuable self-diagnostic information. The components are part of an electrical network designed to control various engine and body subsystems. This article will provide a description of the overall electronic network and the on-board diagnostic capabilities which have been designed to aid the service technician in system diagnosing and testing.

At the heart of the computer system is the Body Control Module (BCM). The BCM is located behind the instrument panel, above fuse block (behind upper right side of instrument panel, on Reatta and Riviera models). The BCM has an integral microprocessor, which is the center for communication with all other components in the system. All sensors and switches are monitored by the BCM or one of the other major components that complete the computer system. The other major components are: Electronic Control Module (ECM), Instrument Panel Cluster (IPC), Cathode Ray Tube Controller (CRTC) (optional on Toronado), Electronic Heater and A/C Control (ECC) (Toronado), Programmer-Heating and A/C (HVAC), and an optional compass (Reatta and Riviera).