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The 1999-2003 Chrysler Concorde/Dodge Intrepid Electrical

Body Control Module

The Body Control Module (BCM) had been upgraded to support the J1850 vehicle communications and diagnostics bus and mounted directly on the junction block located in the lower, left cowl side. It was available in two feature levels-base and premium. It...

  • controled all exterior lamps
  • included a Battery Saver feature that turns off exterior lamps left on for 10 minutes and extinguish courtesy lamps after 60 minutes. The automatic exterior light shut-off does not affect the headlamp time delay feature, which leaves the lights on for only 90 seconds.
  • operated the manual HVAC system.
  • provided control system diagnostics for the manual HVAC system. Diagnostic codes relating to malfunctions of the interface between temperature and mode controls on the instrument panel and door positions in the HVAC unit have been added. They are accessible through the data bus and may be shown on the instrument cluster odometer display.
  • actuated and timed electric rear window defogger (EBL) operation.
  • locked all doors and armed the Vehicle Theft Alarm when any door was locked with the key. In addition it provide a choice of unlocking modes. Unlocking the drivers door with the key unlocks that door only. However, if the key is returned to the "neutral" position and again turned to the unlock position, all doors unlock. Unlocking the passenger door with the key immediately unlocks all doors
  • operated the Remote Keyless Entry (RKE) system. RKE, which was a stand-alone system, was now integrated into the BCM.
  • If the windshield wipers were on when the ignition was switched off, it kept the wiper motor running until the blades were in the park position
  • provided trunk release logic that prevented inadvertent opening. The trunk release button on the instrument panel and the trunk button on the RKE would open the trunk only when the ignition was off (or the transmission was in Park), and the alarm was off
  • provided customer-programmable rolling door locks. The Owner's Manual included instructions for enabling or disabling the feature

Electrical Power Outlet

As shipped from the assembly plant, the outlet (cigarette lighter style) had power only when the ignition was on. By moving a fuse in the instrument panel fuse block, the outlet could have power at all times.

Intra-Vehicle Communications System

A new industry-standard intra-vehicle communications system (SAE J1850) was the means for on-board control modules to share information with each other and to provide plug-in testers with diagnostic information. Concorde and Intrepid were the first Chrysler vehicles to use this technology. J1850 provided the following advantages over the prior communications bus technology:

  • Used a single-wire bus rather than a twisted-pair of wires
  • Transmitted information between modules at 2 to 3 times the data rate
  • Used a more rugged transceiver circuit for improved reliability
  • Provided the capability for immediate acknowledgment that the message was received by the intended receiver
  • Allowed one module to "wake-up" another module over the bus when the engine was not running, if required

Wiring System Improvements

New wiring features and their benefits were as follows:

  • Optimized circuit partitioning and harness routing eliminated over 100 circuits and 8 splices to lower cost and improved reliability. Using vehicle architecture and feature availability information during design, circuits with balanced loads were devised
  • Use of the new industry-standard J1850 vehicle communication and diagnostics bus eliminated 17 circuits and 8 "twisted-pairs" required with the former CCD system
  • A new junction block eliminated over 35 circuits by providing direct, plug-in connections for the BCM, remote keyless entry (RKE) module, and daytime running lamp (DRL) module
  • A snap-in panel on the left end of instrument panel provided access to the fuses and relays. Fuses were identified by diagram molded into the back of the snap-in panel
  • A new power distribution center (PDC) provided mounting for micro-relays and F-type cartridge fuses which take less space than the components they replace, permitting the PDC to house substantially more components in a slightly larger package than in the past. (This was Chrysler's first use of F-type cartridge fuses.) PDC nomenclature was pad printed on the outside and inside of the cover using durable silicone ink. Outer nomenclature identified the PDC and provided a warning of the presence of battery power at its external connectors. Inner nomenclature identified the circuits and functions provided by the fuses and relays respectively
  • Improved electrical grounding increased electrical system reliability. The 1998 Concorde and Intrepid used separate grounding paths for low-current circuits that carry electronic signals and high-current power circuits. This protected the signal circuits from extraneous signals that could adversely affect their operation. Threaded studs with nuts for attaching ground connections were welded to the body at strategic locations. Removing the nut from the stud prior to installing the ground terminals cleaned the studs to assure a positive connection. Where multiple circuits were grounded to the same stud, the wires were welded to a single eyelet to increase reliability and reduce assembly complexity. If one of these wires had to be replaced, it could be cut at the eyelet and a separate terminal added

Improved Routing and Harness Protection

Wire harness durability and freedom from BSRs was enhanced through improved routing and protection that included the following features:

  • Expanded use of weld studs, clips, troughs, and foam tape protected wiring and kept it away from heat and damage
  • Easily accessible positive and negative terminals for the remote-mounted battery facilitated assist starting (jumping). The remote positive terminal mounted behind the right headlight; the negative terminal mounted on the right strut tower

Resistive Multiplexing

Wiring capacity was enhanced through the use of resistors in series with switches on the same circuit to indicate by a voltage level which switch had been pressed. Resistive multiplexing had been added to the headlamp and dimmer switches. It was also used with the new central door locking switches, the manual HVAC control mode switch, the power lock, automatic speed control and windshield wiper switches.

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