Module Communications Network: Overview Lincoln MKZ I 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

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

Scheme 1

MODULE REFERENCE TABLE

Principles of Operation

Both the High Speed Controller Area Network (HS-CAN) and the 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 applications in which modules must respond as rapidly as required by the driver or needed by the process being controlled. 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). Circuits VDB04 (WH/BU) ( HS-CAN +) and VDB05 (WH) ( HS-CAN -) provide the network connection to the PCM. An Integrated Diagnostic System (IDS) session cannot be established if the PCM communication fails when attempting to identify the vehicle.

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 (HS-CAN).

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).

This pinpoint test is intended to diagnose the following

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

The Power Steering Control Module (PSCM) 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. PSCM

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 Transmission Control Module (TCM) is present on hybrid vehicles only. The TCM communicates with the scan tool through the High Speed Controller Area Network (HS-CAN).

Note. Only vehicles with a 3.5L gasoline engine or 2.5L hybrid engine are equipped with a TCM . The PCM controls the transmission on 2.5L gasoline and 3.0L gasoline engine vehicles.

This pinpoint test is intended to diagnose the following

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

The 4X4 control module 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. 4X4 control module

The Headlamp Control Module (HCM) 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. HCM

The Battery Energy Control Module (BECM) is present on hybrid vehicles only. The BECM 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. BECM

The Air Conditioning Compressor Module (ACCM) 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. ACCM

The DC to DC Converter Control Module (DC/DC) is present on hybrid vehicles only. The DC/DC 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. DC/DC

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 Interior Lighting Control Module (ILCM) 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. ILCM

The Side Obstacle Detection Control Module - Left (SOD-L) 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. SOD-L

The Side Obstacle Detection Control Module - Right (SOD-R) 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. SOD-R

The Parking Aid Module (PAM) 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. PAM

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 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 Digital Signal Processing (DSP) 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. Audio DSP module

The Driver Door Module (DDM) 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. DDM

The Dual Climate Controlled Seat Module (DCSM) 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. DCSM

The Driver Seat Module (DSM) 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. DSM

The Accessory Protocol Interface Module (APIM) 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. APIM

When one of the 2 Medium Speed Controller Area Network (MS-CAN) circuits becomes open to a module on the network, intermittent or unreliable communication to all modules on the MS-CAN may result.

The following modules communicate on the MS-CAN

1. Accessory Protocol Interface Module (APIM) (if equipped)
2. Audio Control Module (ACM)
3. Audio Digital Signal Processing (DSP) module (if equipped)
4. Driver Seat Module (DSM) (if equipped)
5. Driver Door Module (DDM) (if equipped)
6. Dual Climate Controlled Seat Module (DCSM) (if equipped)
7. Front Controls Interface Module (FCIM)
8. Front Display Interface Module (FDIM)
9. Global Positioning System Module (GPSM) (if equipped)
10. HVAC module
11. Instrument Panel Cluster (IPC)
12. Interior Lighting Control Module (ILCM) (if equipped)
13. Parking Aid Module (PAM) (if equipped)
14. Side Obstacle Detection Control Module - Left (SOD-L) (if equipped)
15. Side Obstacle Detection Control Module - Right (SOD-R) (if equipped)
16. Smart Junction Box (SJB)

This pinpoint test is intended to diagnose the following

1. Circuit VDB06 (GY/OG) ( MS-CAN +) open
2. Circuit VDB07 (VT/OG) ( MS-CAN -) open

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

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Accessory Protocol Interface Module (APIM) (if equipped)
3. Audio Control Module (ACM)
4. Audio Digital Signal Processing (DSP) module (if equipped)
5. Driver Door Module (DDM) (if equipped)
6. Driver Seat Module (DSM) (if equipped)
7. Dual Climate Controlled Seat Module (DCSM) (if equipped)
8. Front Controls Interface Module (FCIM)
9. Front Display Interface Module (FDIM)
10. Global Positioning System Module (GPSM) (if equipped)
11. HVAC module (if equipped)
12. Interior Lighting Control Module (ILCM) (if equipped)
13. Instrument Panel Cluster (IPC) (gateway module)
14. Parking Aid Module (PAM) (if equipped)
15. Smart Junction Box (SJB)
16. Side Obstacle Detection Control Module - Left (SOD-L) (if equipped)
17. Side Obstacle Detection Control Module - Right (SOD-R) (if equipped)

When one of the 2 High Speed Controller Area Network (HS-CAN) circuits becomes open to a module on the network, intermittent or unreliable communication to all modules on the HS-CAN may result.

The following modules communicate on the HS-CAN

1. 4X4 control module (if equipped)
2. ABS module
3. Accessory Protocol Interface Module (APIM) (if equipped)
4. Air Conditioning Compressor Module (ACCM) (Hybrid only)
5. Battery Energy Control Module (BECM) (Hybrid only)
6. DC/DC (Hybrid only)
7. Headlamp Control Module (HCM) (if equipped)
8. Instrument Panel Cluster (IPC)
9. Occupant Classification System Module (OCSM)
10. PCM
11. Power Steering Control Module (PSCM) (if equipped)
12. Restraints Control Module (RCM)
13. Transmission Control Module (TCM) (if equipped)

This pinpoint test is intended to diagnose the following

1. Circuit VDB04 (WH/BU) ( HS-CAN +) open
2. Circuit VDB05 (WH) ( HS-CAN -) open

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

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. 4X4 control module (if equipped)
3. ABS module
4. Accessory Protocol Interface Module (APIM) (if equipped)
5. Air Conditioning Compressor Module (ACCM) (Hybrid only)
6. Battery Energy Control Module (BECM) (Hybrid only)
7. DC to DC Converter Control Module (DC/DC) (Hybrid only)
8. Headlamp Control Module (HCM) (if equipped)
9. Instrument Panel Cluster (IPC) (gateway module)
10. Occupant Classification System Module (OCSM)
11. PCM
12. Power Steering Control Module (PSCM) (if equipped)
13. Restraints Control Module (RCM)
14. Transmission Control Module (TCM) (if equipped)

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

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 pinpoint test is intended to diagnose the following

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

See also:
• SUPPLEMENTAL RESTRAINT SYSTEM
• SEATING