Home ReviewsRefund
Home/Ford/Fusion/Ford Fusion I facelift (2005-2012)/Repair manual/Communication Devices/Module Communications Network: Overview
Contents Wiring diagrams Section: Communication Devices All sections

Module Communications Network: Overview Ford Fusion I facelift

Communication Devices 2 illustrations ~3472 words

Note. The smart junction box (SJB) is also known as the generic electronic module (GEM).

Vehicle communication utilizes both medium and high speed controller area network (CAN) communications. CAN is used for many modules to communicate with each other on a common network. CAN in-vehicle networking is a method for transferring data among distributed electronic modules using a serial data bus. Without serial networking, intermodule communication requires dedicated, point to point wiring resulting in bulky, expensive, complex, and difficult to install wiring harnesses. Applying a serial data network reduces the number of wires, thereby combining the signals on a single network. Information is sent to the individual control modules that control each function.

The vehicle has 2 module communication networks

  1. Medium speed (MS) CAN
  2. High speed (HS) CAN

Both networks are connected to the data link connector (DLC), located under the dash. This makes diagnosis and testing of these systems easier by allowing one scan tool to be able to diagnose and control any module on both networks from one connector. The DLC can be found under the instrument panel between the steering column and the audio control module (ACM).

Scheme 6

Scheme 6
Scheme 6
Module NameNetwork TypeTermination Module
Accessory protocol interface module (APIM) (if equipped)HS-CAN MS-CANNo No
Audio control module (ACM)MS-CANNo
Audio digital signal processing (DSP) module (if equipped)MS-CANNo
ABS moduleHS-CANNo
Driver door module (DDM) (if equipped)MS-CANNo
Driver seat module (DSM) (if equipped)MS-CANNo
Heating ventilation air conditioning (HVAC) module (if equipped)MS-CANNo
Dual climate control seat module (DCSM) (if equipped)MS-CANNo
4X4 control module (if equipped)HS-CANNo
Instrument cluster (IC) (gateway module)HS-CAN MS-CANYes Yes
Occupant classification system module (OCSM)HS-CANNo
PCMHS-CANYes
Restraints control module (RCM)HS-CANNo
Smart junction box (SJB)MS-CANYes
Satellite digital audio receiver system (SDARS) module (if equipped)MS-CANNo
Transmission control module (TCM)HS-CANNo

MS-CAN Operation

The MS-CAN communicates using bussed messages. The MS-CAN has an unshielded twisted pair cable, data bus (+) and data bus (-) circuits. In addition to scan tool communication, this network allows sharing of information between all modules on the network.

The MS-CAN is a medium speed communication network used for the following modules

  1. Accessory protocol interface module (APIM) (if equipped)
  2. Audio control module (ACM)
  3. Audio digital signal processing (DSP) module (if equipped)
  4. Driver door module (DDM) (if equipped)
  5. Driver seat module (DSM) (if equipped)
  6. Dual climate control seat module (DCSM) (if equipped)
  7. Heating ventilation air conditioning (HVAC) module
  8. Instrument cluster (IC)
  9. Parking aid module (PAM)
  10. Satellite digital audio receiver system (SDARS) module (if equipped)
  11. Smart junction box (SJB)

HS-CAN Operation

The HS-CAN communicates using bussed messages. The HS-CAN uses an unshielded twisted pair cable, data bus (+) and data bus (-) circuits. In addition to scan tool communication, this network allows sharing of information between all modules on the network.

The HS-CAN is a high speed communication network used for the following modules

  1. Accessory protocol interface module (APIM) (if equipped)
  2. ABS module
  3. Instrument cluster (IC)
  4. Occupant classification system module (OCSM)
  5. PCM
  6. Restraints control module (RCM)
  7. Transmission control module (TCM) (if equipped)
  8. 4X4 control module

Principles of Operation

Note. The smart junction box (SJB) is also known as the generic electronic module (GEM).

Vehicle communication utilizes both medium and high speed controller area network (CAN) communications. CAN is a method for transferring data among distributed electronic modules using a serial data bus.

The vehicle is equipped with 2 module communication networks

  1. Medium speed (MS) CAN
  2. High speed (HS) CAN

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.

The PCM shares the HS-CAN with the following modules

  1. ABS module
  2. Accessory protocol interface module (APIM) (if equipped)
  3. Instrument cluster (IC)
  4. Occupant classification system module (OCSM)
  5. Restraints control module (RCM)
  6. Transmission control module (TCM) (if equipped)
  7. 4X4 control module (if equipped)

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. PCM

The transmission control module (TCM) 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 TCM. The FNR5 transaxle TCM and the 6-speed transaxle TCM both communicate on the HS-CAN. Voltage for the TCM is provided by circuits CBP18 (GY/OG), SBP07 (WH/RD) and SBB16 (VT/RD). Both circuits GD120 (BK/GN) provide ground.

The TCM shares the HS-CAN with the following modules

  1. ABS module
  2. Accessory protocol interface module (APIM) (if equipped)
  3. Instrument cluster (IC)
  4. Occupant classification system module (OCSM)
  5. PCM
  6. Restraints control module (RCM)
  7. 4X4 control module (if equipped)

This pinpoint test is intended to diagnose the following

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

The ABS module 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 ABS module. Voltage for the ABS module is provided by circuit CBP19 (BN/WH). Ground is provided by circuit GD123 (BK/GY).

The ABS module shares the HS-CAN with the following modules

  1. ABS module
  2. Accessory protocol interface module (APIM) (if equipped)
  3. Instrument cluster (IC)
  4. Occupant classification system module (OCSM)
  5. PCM
  6. Restraints control module (RCM)
  7. Transmission control module (TCM) (if equipped)
  8. 4X4 control module (if equipped)

This pinpoint test is intended to diagnose the following

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

The restraints control module (RCM) 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 RCM. Voltage for the RCM is provided by circuit CBP21 (BU/GY), and the RCM is case grounded.

The RCM shares the HS-CAN with the following modules

  1. ABS module
  2. Accessory protocol interface module (APIM) (if equipped)
  3. Instrument cluster (IC)
  4. Occupant classification system module (OCSM)
  5. PCM
  6. Transmission control module (TCM) (if equipped)
  7. 4X4 control module (if equipped)

This pinpoint test is intended to diagnose the following

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

The 4X4 control module 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 4X4 control module. Voltage to the 4X4 control module is supplied by circuits CBP19 (BN/WH) and SBP15 (WH/RD). Ground is supplied by circuit GD126 (BK/WH).

The 4X4 control module shares the HS-CAN with the following modules

  1. ABS module
  2. Accessory protocol interface module (APIM) (if equipped)
  3. Instrument cluster (IC)
  4. Occupant classification system module (OCSM)
  5. PCM
  6. Restraints control module (RCM)
  7. Transmission control module (TCM) (if equipped)

This pinpoint test is intended to diagnose the following

  1. Fuse
  2. Wiring, terminals or connectors
  3. 4X4 control module

The occupant classification system module (OCSM) 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 OCSM. Voltage to the OCSM is supplied by circuit CBP24 (VT/GN). Ground is supplied by circuit GD127 (BK/BU).

The OCSM shares the HS-CAN with the following modules

  1. ABS module
  2. Accessory protocol interface module (APIM) (if equipped)
  3. Instrument cluster (IC)
  4. PCM
  5. Restraints control module (RCM)
  6. Transmission control module (TCM) (if equipped)
  7. 4X4 control module (if equipped)

This pinpoint test is intended to diagnose the following

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

The instrument cluster (IC) 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 HS-CAN connection to the IC and circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the MS-CAN connection to the IC. Voltage for the IC is provided by circuits CBP23 (BN/YE), SBP07 (WH/RD) and CBP20 (YE/VT). Circuit GD116 (BK/VT) provides ground.

The IC shares the HS-CAN with the following modules

  1. ABS module
  2. Accessory protocol interface module (APIM) (if equipped)
  3. Instrument cluster (IC)
  4. Occupant classification system module (OCSM)
  5. PCM
  6. Restraints control module (RCM)
  7. Transmission control module (TCM) (if equipped)
  8. 4X4 control module (if equipped)

The IC shares the MS-CAN with the following modules

  1. 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 control seat module (DCSM) (if equipped)
  7. Heating ventilation air conditioning (HVAC) module (if equipped)
  8. Parking aid module (PAM) (if equipped)
  9. Satellite digital audio receiver system (SDARS) module (if equipped)
  10. Smart junction box (SJB)

This pinpoint test is intended to diagnose the following

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

The smart junction box (SJB) communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the SJB. Voltage for the SJB is provided by circuit SBB19 (BU/RD). Circuit GD116 (BK/VT) provides ground.

The SJB shares the MS-CAN with the following modules

  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 control seat module (DCSM) (if equipped)
  7. Heating ventilation air conditioning (HVAC) module (if equipped)
  8. Instrument cluster (IC)
  9. Parking aid module (PAM) (if equipped)
  10. Satellite digital audio receiver system (SDARS) module (if equipped)

This pinpoint test is intended to diagnose the following

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

The vehicle may be equipped with either a single-zone or dual-zone automatic HVAC module or a manual (non-HVAC) climate control system. This test diagnoses the HVAC module systems. Voltage for the HVAC module is provided by circuits CBP20 (YE/VT) and SBP07 (WH/RD). Circuit GD116 (BK/VT) provides ground.

The HVAC module shares the MS-CAN with the following modules

  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 control seat module (DCSM) (if equipped)
  7. Instrument cluster (IC)
  8. Parking aid module (PAM) (if equipped)
  9. Satellite digital audio receiver system (SDARS) module (if equipped)
  10. Smart junction box (SJB)

This pinpoint test is intended to diagnose the following

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

The parking aid module (PAM) communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the PAM. Voltage for the PAM is provided by circuit CBP35 (YE/GY). Circuit GD133 (BK) provides ground.

The PAM shares the MS-CAN with the following modules

  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 control seat module (DCSM) (if equipped)
  7. Heating ventilation air conditioning (HVAC) module (if equipped)
  8. Instrument cluster (IC)
  9. Satellite digital audio receiver system (SDARS) module (if equipped)
  10. Smart junction box (SJB)

This pinpoint test is intended to diagnose the following

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

The audio control module (ACM) communicate with the scan tool through the medium speed controller area network (MS-CAN) circuits VDB06 (GY/OG) and VDB07 (VT/OG).

Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the ACM. Voltage for the ACM is provided by circuits CBP02 (GN) and SBP11 (BU/RD). Circuit GD114 (BK/BU) provides ground.

The ACM shares the MS-CAN with the following modules

  1. Accessory protocol interface module (APIM) (if equipped)
  2. Audio digital signal processing (DSP) module (if equipped)
  3. Driver seat module (DSM) (if equipped)
  4. Driver door module (DDM) (if equipped)
  5. Dual climate control seat module (DCSM) (if equipped)
  6. Heating ventilation air conditioning (HVAC) module (if equipped)
  7. Instrument cluster (IC)
  8. Parking aid module (PAM) (if equipped)
  9. Satellite digital audio receiver system (SDARS) module (if equipped)
  10. Smart junction box (SJB)

This pinpoint test is intended to diagnose the following

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

The audio digital signal processing (DSP) module communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the DSP module. Voltage for the DSP module amplifier is provided by circuits SBB20 (GN/RD) and SBB21 (GY/RD). Circuit GD148 (BK/YE) provides ground.

The DSP module shares the MS-CAN with the following modules

  1. Accessory protocol interface module (APIM) (if equipped)
  2. Audio control module (ACM)
  3. Driver seat module (DSM) (if equipped)
  4. Driver door module (DDM) (if equipped)
  5. Dual climate control seat module (DCSM) (if equipped)
  6. Heating ventilation air conditioning (HVAC) module (if equipped)
  7. Instrument cluster (IC)
  8. Parking aid module (PAM) (if equipped)
  9. Satellite digital audio receiver system (SDARS) module (if equipped)
  10. Smart junction box (SJB)

This pinpoint test is intended to diagnose the following

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

The satellite digital audio receiver system (SDARS) module communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the SDARS module. Voltage for the SDARS module is provided by circuit SBP15 (WH/RD). Circuit GD148 (BK/YE) provides ground.

The SDARS module shares the MS-CAN with the following modules

  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 control seat module (DCSM) (if equipped)
  7. Heating ventilation air conditioning (HVAC) module (if equipped)
  8. Instrument cluster (IC)
  9. Parking aid module (PAM) (if equipped)
  10. Smart junction box (SJB)

This pinpoint test is intended to diagnose the following

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

The driver door module (DDM) communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the DDM. Voltage for the DDM is provided by circuit SBP15 (RD/WH). Circuit GD126 (BK/WH) provides ground.

The DDM shares the MS-CAN with the following modules

  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. Dual climate control seat module (DCSM) (if equipped)
  6. Heating ventilation air conditioning (HVAC) module (if equipped)
  7. Instrument cluster (IC)
  8. Parking aid module (PAM) (if equipped)
  9. Satellite digital audio receiver system (SDARS) module (if equipped)
  10. Smart junction box (SJB)

This pinpoint test is intended to diagnose the following

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

The driver seat module (DSM) communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the DSM. Voltage for the DSM is provided by circuit SBB15 (WH/RD). Circuit GD126 (BK/WH) provides ground.

The DSM shares the MS-CAN with the following modules

  1. Accessory protocol interface module (APIM) (if equipped)
  2. Audio control module (ACM)
  3. Audio digital signal processing (DSP) module (if equipped)
  4. Driver door module (DDM) (if equipped)
  5. Dual climate control seat module (DCSM) (if equipped)
  6. Heating ventilation air conditioning (HVAC) module (if equipped)
  7. Instrument cluster (IC)
  8. Parking aid module (PAM) (if equipped)
  9. Satellite digital audio receiver system (SDARS) module (if equipped)
  10. Smart junction box (SJB)

This pinpoint test is intended to diagnose the following

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

The dual climate control seat module (DCSM) communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the DCSM. Voltage for the DCSM is provided by circuits SBB11 (BU/RD) and SBB12 (GN/RD). Circuit GD139 (BK/YE) provides ground.

The DCSM shares the MS-CAN with the following modules

  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. Heating ventilation air conditioning (HVAC) module (if equipped)
  7. Instrument cluster (IC)
  8. Parking aid module (PAM) (if equipped)
  9. Satellite digital audio receiver system (SDARS) module (if equipped)
  10. Smart junction box (SJB)

This pinpoint test is intended to diagnose the following

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

The accessory protocol interface module (APIM) 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 HS-CAN connection to the APIM. Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the MS-CAN connection to the APIM. Voltage for the APIM is provided by circuit SBB13 (GY/RD) . Circuit GD148 (BK/YE) provides ground.

The APIM shares the HS-CAN with the PCM, the ABS module, the instrument cluster (IC), the occupant classification system module (OCSM), the transmission control module (TCM) and the restraints control module (RCM).

The APIM shares the MS-CAN with the audio control module (ACM), the parking aid module (PAM), the driver seat module (DSM), the driver door module (DDM), the dual climate control seat module (DCSM), the audio digital signal processing (DSP) module, the satellite digital audio receiver system (SDARS) module, the HVAC module, the instrument cluster (IC) and the smart junction box (SJB).

This pinpoint test is intended to diagnose the following

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

The 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. SJB
  3. Instrument cluster (IC)
  4. Accessory protocol interface module (APIM) (if equipped)
  5. Audio control module (ACM)
  6. Audio digital signal processing (DSP) module (if equipped)
  7. Heating ventilation air conditioning (HVAC) module (if equipped)
  8. Parking aid module (PAM) (if equipped)
  9. Driver door module (DDM) (if equipped)
  10. Driver seat module (DSM) (if equipped)
  11. Dual climate control seat module (DCSM) (if equipped)
  12. Satellite digital audio receiver system (SDARS) module (if equipped)

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

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. Heating ventilation air conditioning (HVAC) module (if equipped)
  8. Instrument cluster (IC)
  9. Parking aid module (PAM) (if equipped)
  10. Satellite digital audio receiver system (SDARS) module (if equipped)
  11. Smart junction box (SJB)

In the event that one of the 2 network circuits (HS-CAN + or HS-CAN -) becomes open to a module on the network, unreliable network communication to all modules on the network may result.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors

The 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. PCM
  3. ABS module
  4. Accessory protocol interface module (APIM) (if equipped)
  5. Transmission control module (TCM)
  6. 4X4 control module (if equipped)
  7. Instrument cluster (IC)
  8. Occupant classification system module (OCSM)
  9. Restraints control module (RCM)

An open circuit VDB04 (WH/BU) (HS-CAN +) or VDB05 (WH) (HS-CAN -) may cause intermittent or unreliable communication to all modules on the HS-CAN. In the event that one of the 2 network circuits (HS-CAN + or HS-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 HS-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. Heating ventilation air conditioning (HVAC) module (if equipped)
  8. Instrument cluster (IC)
  9. Parking aid module (PAM) (if equipped)
  10. Satellite digital audio receiver system (SDARS) module (if equipped)
  11. Smart junction box (SJB)

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors

The scan tool is connected to the data link connector (DLC) to communicate with the high speed controller area network (HS-CAN) and the medium speed controller area network (MS-CAN) communications network. Voltage for the scan tool is provided by circuit SBP11 (BU/RD). Ground is provided by both circuits GD116 (BK/VT).

This pinpoint test is intended to diagnose the following

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

Scheme 7

Scheme 7: PINPOINT TEST V: NO POWER TO THE SCAN TOOL
Scheme 7: PINPOINT TEST V: NO POWER TO THE SCAN TOOL
  1. V1 CHECK THE DLC PINS FOR DAMAGE NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test. Disconnect the scan tool cable from the DLC. Inspect DLC pins 4, 5 and 16 for damage. Are DLC pins 4, 5 and 16 OK? YES : Go to V2 . NO : REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
  2. V2 CHECK THE DLC VOLTAGE SUPPLY CIRCUIT SBP11 (BU/RD) FOR AN OPEN Measure the voltage between the DLC C251-16, circuit SBP11 (BU/RD), harness side and ground. Is the voltage greater than 10 volts? YES : Go to V3 . NO : VERIFY the smart junction box (SJB) fuse 18 (20A) is OK. If OK, REPAIR the circuit. REPEAT the network test with the scan tool.
  3. V3 CHECK THE DLC GROUND CIRCUITS GD116 (BK/VT) FOR AN OPEN Measure the resistance between the DLC C251-4, circuit GD116 (BK/VT), harness side and ground; and between the DLC C251-5, circuit GD116 (BK/VT), harness side and ground. Are the resistances less than 5 ohms? YES : REPAIR the scan tool. REPEAT the network test with the scan tool. NO : REPAIR the circuit in question. REPEAT the network test with the scan tool.

See also:
• SEATING

More articles — Module Communications Network