Body Control Computer - Introduction: Overview — Dodge Ram Van B3500 (1996-2003)

IDENTIFICATION

Application	Body
Breeze, Cirrus & Stratus	JA
Caravan, Town & Country, & Voyager	NS
Concorde, Intrepid, LHS & 300M	LH
Dakota	AN
Durango	DN
Pickup	BR
Ram Van & Ram Wagon	AB
Sebring Convertible	JX

BODY IDENTIFICATION

Modules (1)	Body
Air Bag System Control Module (ABSCM)	All Models
Anti-Lock Brake Controller	JA, JX, LH & NS
Automatic Temperature Control (ATC) (2)	LH
Body Control Module (BCM)	JA, JX, LH & NS
Central Timer Module (CTM)	AB, AN, BR & DN
Compass/Mini-Trip Computer	AN, DN, JA, JX & NS
Mechanical Instrument Cluster (MIC)	All Models
Overhead Travel Information System (OTIS)	LH
Remote Keyless Entry (RKE)	BR, JA, JX, LH & NS
Smart Key Immobilizer Module	JX
Transmission Control Module (TCM)	JA, JX, LH & NS
Vehicle Information Center (VIC)	NS
Vehicle Theft Security System (VTSS)	BR, JA, JX, LH & NS
(1) Modules or systems that communicate over CCD bus. (2) For Automatic Temperature Control (ATC) system and A/C-heater system diagnostic information, see appropriate article in AUTOMATIC A/C-HEATER SYSTEMS in AIR CONDITIONING.

(1)	Modules or systems that communicate over CCD bus.

(2)	For Automatic Temperature Control (ATC) system and A/C-heater system diagnostic information, see appropriate article in AUTOMATIC A/C-HEATER SYSTEMS in AIR CONDITIONING.

MODULE APPLICATIONS

DESCRIPTION

The body control computer system consists of a combination of modules that communicate over the Chrysler Collision Detection (CCD) bus system on all models except Concorde and Intrepid. Concorde and Intrepid communicate over the Programmable Communication Interface (PCI) bus system. Through the CCD or 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.

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

Chime system
Compass/Mini-Trip Computer (CMTC)
Door ajar system
Exterior lighting
Instrument cluster
Interior lighting
Intermittent wipers
Mechanical Instrument Cluster (MIC)
Memory Heated Seat/Mirror System (MHSMS)
Power door locks
Power windows
Remote keyless entry
Sentry Key Immobilizer System (SKIS)
Vehicle Information System (VIC)
Vehicle Theft Security System (VTSS).

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.

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 Module (BCM) is part of junction block located under left side of instrument panel on JA, JX and NS models. On LH models, BCM is mounted to junction block located behind left end cap of instrument panel. BCM stores odometer information for electronic instrument cluster display and provides power and ground for a variety of systems.

The BCM on all models except Concorde, Intrepid, LHS and 300M is the only module that has the capability of providing both "bias" and "termination" on the CCD bus system. See CCD BUS SYSTEM. Systems are monitored by BCM through voltage drops.

Vehicle may be equipped with either a premium or base model BCM. Base body control computer is used on vehicles with a mechanical instrument cluster.

On JA body, premium BCM is used on vehicles with a trunk ajar switch. On LH body, premium BCM can be identified by the presence of either the Automatic Temperature Control (ATC) system, Overhead Travel Information System (OTIS), or both.

CONNECTOR IDENTIFICATION

Note. For terminal identification of body control system connectors, use appropriate illustration(s). See CONNECTOR IDENTIFICATION DIRECTORY . Connector terminal numbers may be molded into connectors. If connector terminal identification differs from that shown in figure, use wire colors to ensure correct circuit is being tested. See WIRING DIAGRAMS .

Connector		See Fig.
ABS Controller (JA, JX, LH & NS Bodies)		(Scheme 2)
Air Bag Control Module (JA, JX & NS Bodies)		(Scheme 3)
Air Bag Control Module (AB, AN, BR, DN & LH Bodies)		(Scheme 4)
ATC Module (LH Body)		(Scheme 5)
ATC Sun Sensor/VTSS Indicator (LH Body)		(Scheme 6)
Body Control Module 10-Pin (JA & JX Bodies)		(Scheme 7)
Body Control Module 14-Pin (JA & JX Bodies)		(Scheme 8)
Body Control Module 20-Pin (JA & JX Bodies)		(Scheme 9)
Body Control Module 22-Pin (JA & JX Bodies)		(Scheme 10)
Body Control Module (LH Body)
"C1" 14-Pin (Gray)		(Scheme 11)
"C2" 24-Pin (Black)		(Scheme 12)
"C3" 12-Pin (Bone)		(Scheme 13)
"C4" 16-Pin (Blue)		(Scheme 14)
Body Control Module (NS Body)		(Scheme 15)
Central Timer Module "A" (AN, BR & DN Bodies)		(Scheme 16)
Central Timer Module "B" (AN, BR & DN Bodies)		(Scheme 17)
Central Timer Module (AB Body)
"C1" (Green)		(Scheme 16)
"C2" (White)		(Scheme 17)
Compass Mini-Trip Computer (AN & DN Bodies)		(Scheme 18)
Compass Mini-Trip Computer (JA & JX Bodies)		(Scheme 19)
Compass Mini-Trip Computer (NS Body)		(Scheme 20)
Courtesy Light Relay (JA & JX Bodies)		(Scheme 21)
Data Link (DLC)		(Scheme 22)
Door Lock Motor/Ajar Switch (DN & LH Bodies)		(Scheme 23)
Electrochromic Mirror (NS Body)		(Scheme 24)
Fuel Pump
LH Body		(Scheme 25)
NS Body		(Scheme 26)
Fuel Pump Module (JA & JX Bodies)		(Scheme 27)
Headlight Switch
Caravan & Voyager		(Scheme 28)
8-Pin, NS Body		(Scheme 29)
LH & NS Bodies		(Scheme 30)
AB Body		(Scheme 31)
Headliner (LH Body)		(Scheme 32)
HVAC Control Module (Blue - NS Body)		(Scheme 33)
Ignition Switch (LH Body)		(Scheme 35)
Ignition Switch (NS Body)		(Scheme 36)
Information Center (NS Body)		(Scheme 30)
Ignition Switch (JA & JX Bodies)		(Scheme 34)
Instrument Cluster
JA & JX Bodies		(Scheme 37)
All Except JA, JX & NS Models		(Scheme 38)
NS Body		(Scheme 39)
Junction Block 6-Pin (JA & JX Bodies)		(Scheme 40)
Junction Block (Typical - NS Body Shown)		(Scheme 41)
Junction Block Internal (NS Body)		(Scheme 42)
Key-In Ignition
AN & DN Bodies		(Scheme 43)
BR Body		(Scheme 44)
Memory Heated Seat/Mirror Module (LH Body)
12-Pin Connector		(Scheme 45)
16-Pin Connector		(Scheme 46)
26-Pin Connector		(Scheme 47)
Memory Mirror (LH Body)		(Scheme 48)
Multifunction Switch 10-Pin (JA & JX Bodies)		(Scheme 49)
Multifunction Switch (AN, BR & DN Bodies)		(Scheme 50)
Multifunction Switch 7-Pin (JA, JX & LH Bodies)		(Scheme 51)
Multifunction Switch (NS Body)		(Scheme 52)
OTIS Module (LH Body)		(Scheme 53)
Parking Light (NS Body)		(Scheme 54)
Power Door Lock Module (AB Body)		(Scheme 55)
Power Door Lock Switch
AB Body		(Scheme 56)
AN & BR Body		(Scheme 58)
Power Door Lock/Window Switch (DN Body)		(Scheme 57)
Power Seat Switch (LH Body)		(Scheme 59)
Power Seat Memory Switch (LH Body)		(Scheme 20)
Power Seat Memory Heater Switch (LH Body)		(Scheme 20)
Power Top Switch		(Scheme 60)
Powertrain Control Module
AB, AN & DN Bodies		(Scheme 61)
Except AB, AN & DN Bodies		(Scheme 62)
Remote Keyless Entry (RKE) Module (NS Body)		(Scheme 20)
Relay (Typical)		(Scheme 63)
Relay Center (AN & DN Bodies)		(Scheme 64)
Seat Belt Module (BR & JX Body)		(Scheme 65)
Sentry Key Immobilizer Module (JA, JX & LH Bodies)		(Scheme 66)
Steering Column (AB Body)		(Scheme 67)
Transmission Control Module Connector		(Scheme 68)
Wiper Motor
AN & DN Bodies		(Scheme 69)
BR Body		(Scheme 70)
JA & JX Bodies		(Scheme 71)
LH Body		(Scheme 72)
NS Body		(Scheme 73)