Module Communications Network: Overview Ford Mustang V рестайлинг

Note. The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).

Multiplexing is a method of sending 2 or more signals simultaneously over a single circuit. Multiplexing is used to allow 2 or more electronic modules (nodes) to communicate simultaneously over a twisted-wire pair [data (+) and data (-)] network. The information or messages that can be communicated on these wires consists of commands, status or data. The advantage of using multiplexing is to reduce the weight of the vehicle by reducing the number of redundant components and electrical wiring.

The vehicle has 2 module communication networks which are connected to the Data Link Connector (DLC), located under the instrument panel on the driver side

1. High Speed Controller Area Network (HS-CAN)
2. Medium Speed Controller Area Network (MS-CAN)

The HS-CAN and MS-CAN are defined by various ISO documents

1. ISO 11898 specifies the electrical, mechanical, and procedural interface for Controller Area Network (CAN) serial communication technology.
2. ISO 15765 specifies network-layer protocol and timing parameters for CAN -based systems.
3. ISO 14229 specifies a common set of unified diagnostics and changes the way PIDs, DTCs and active commands are processed and displayed on the scan tool.

Scheme 1

NETWORK TOPOLOGY REFERENCE CHART

Principles of Operation

Both High Speed Controller Area Network (HS-CAN) and Medium Speed Controller Area Network (MS-CAN) use an unshielded twisted-pair cable of data (+) and data (-) circuits. The HS-CAN operates at a maximum data transfer speed of 500 Kbps and is designed for real time information transfer and control. The MS-CAN operates at a maximum data transfer speed of 125 Kbps for bus messages and is designed for general information transfer.

Normal Operation

The PCM communicates with the scan tool through the High Speed Controller Area Network (HS-CAN).

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. PCM

The ABS module communicates with the scan tool through the High Speed Controller Area Network (HSCAN).

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. ABS module

The Instrument Panel Cluster (IPC) communicates with the scan tool through the High Speed Controller Area Network (HS-CAN) and the Medium Speed Controller Area Network (MS-CAN).

This pinpoint test is intended to diagnose the following

1. Fuse(s)
2. Wiring, terminals or connectors
3. IPC

The Restraints Control Module (RCM) communicates with the scan tool through the High Speed Controller Area Network (HS-CAN).

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. Case ground open
4. RCM

The Occupant Classification System Module (OCSM) communicates with the scan tool through the High Speed Controller Area Network (HS-CAN).

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. OCSM

The Smart Junction Box (SJB) communicates with the scan tool through the Medium Speed Controller Area Network (MS-CAN).

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. SJB

The Body Control Module B (BCM-B) communicates with the scan tool through the Medium Speed Controller Area Network (MS-CAN).

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. BCM-B

The HVAC module communicates with the scan tool through the Medium Speed Controller Area Network (MS-CAN).

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. HVAC module

The Audio Control Module (ACM) communicates with the scan tool through the Medium Speed Controller Area Network (MS-CAN).

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. ACM

The Front Controls Interface Module (FCIM) communicates with the scan tool through the Medium Speed Controller Area Network (MS-CAN).

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. FCIM

The Front Display Interface Module (FDIM) communicates with the scan tool through the Medium Speed Controller Area Network (MS-CAN).

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. FDIM

The Global Positioning System Module (GPSM) communicates with the scan tool through the Medium Speed Controller Area Network (MS-CAN).

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. GPSM

The Accessory Protocol Interface Module (APIM) communicates with the scan tool and other modules through the Medium Speed Controller Area Network (MS-CAN) and also communicates with other modules on the High Speed Controller Area Network (HS-CAN).

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. APIM

The Power Steering Control Module (PSCM) communicates with the scan tool and other modules through the High Speed Controller Area Network (HS-CAN).

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. PSCM

The Medium Speed Controller Area Network (MS-CAN) uses an unshielded twisted pair cable, circuits VDB06 ( MS-CAN +) and VDB07 ( MS-CAN -). In the event that 1 of the 2 network circuits ( MS-CAN + or MS-CAN -) becomes open to a module on the network, unreliable network communication to all modules on the network may result.

The following modules communicate on the MS-CAN

1. Audio Control Module (ACM)
2. Accessory Protocol Interface Module (APIM) (if equipped)
3. Body Control Module B (BCM-B)
4. Front Controls Interface Module (FCIM)
5. Front Display Interface Module (FDIM)
6. Global Positioning System Module (GPSM)
7. HVAC module
8. Instrument Panel Cluster (IPC)
9. Smart Junction Box (SJB)

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors

The Medium Speed Controller Area Network (MS-CAN) uses an unshielded twisted pair cable, circuits VDB06 ( MS-CAN -) and VDB07 ( MS-CAN +).

Note. The Instrument Panel Cluster (IPC), while on the MS-CAN , communicates with the scan tool only on the High Speed Controller Area Network (HS-CAN).

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Audio Control Module (ACM)
3. Accessory Protocol Interface Module (APIM) (if equipped)

1. Body Control Module B (BCM-B)
2. Front Controls Interface Module (FCIM)
3. Front Display Interface Module (FDIM)
4. Global Positioning System Module (GPSM)
5. HVAC module
6. Instrument Panel Cluster (IPC)
7. Smart Junction Box (SJB)

The High Speed Controller Area Network (HS-CAN) uses an unshielded twisted pair cable, circuits VDB04 ( HS-CAN +) and VDB05 ( HS-CAN -). In the event that either circuit ( HS-CAN + or HS-CAN -) becomes open to any module on the network, unreliable network communication to all modules on the network may result.

The following modules communicate on the HS-CAN

1. ABS module
2. Accessory Protocol Interface Module (APIM) (if equipped)
3. Instrument Panel Cluster (IPC)
4. Restraints Control Module (RCM)
5. Occupant Classification System Module (OCSM)
6. PCM
7. Power Steering Control Module (PSCM)

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors

The High Speed Controller Area Network (HS-CAN) uses an unshielded twisted pair cable, circuits VDB04 ( HS-CAN +) and VDB05 ( HS-CAN -).

Note. The APIM , while on the HS-CAN , communicates with the scan tool only on the Medium Speed Controller Area Network (MS-CAN).

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. ABS module
4. Accessory Protocol Interface Module (APIM) (if equipped)
5. Instrument Panel Cluster (IPC)
6. Restraints Control Module (RCM)
7. Occupant Classification System Module (OCSM)
8. PCM
9. Power Steering Control Module (PSCM)

The scan tool is connected to the Data Link Connector (DLC) to communicate with the High Speed Controller Area Network (HS-CAN) and Medium Speed Controller Area Network (MS-CAN).

A loss of ground or poor ground at the DLC may result in HS-CAN or MS-CAN faults while the scan tool is connected. This may cause multiple malfunction indicators to be on with the scan tool connected to the DLC .

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. Scan tool
4. DLC