Pinpoint Test V: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, One Or More Modules Are Not Respo
Communications Network
Pinpoint Tests
Pinpoint Test V: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, One Or More Modules Are Not Responding During Network Test
Normal Operation
The Medium Speed Controller Area Network (MS-CAN) uses an unshielded twisted pair cable. Circuits VDB06 (GY/OG) and VDB07 (VT/OG) provide the network connection to all modules on the network. 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 with the scan tool using the MS-CAN:
- Accessory Protocol Interface Module (APIM)
- Audio Control Module (ACM)
- Audio Digital Signal Processing (DSP) module
- Driver Seat Module (DSM)
- Dual Climate Controlled Seat Module (DCSM)
- Front Controls Interface Module (FCIM)
- Front Display Interface Module (FDIM)
- Global Positioning System Module (GPSM)
- HVAC module
- Interior Lighting Control Module (ILCM)
- Instrument Cluster (IC)
- Parking Aid Module (PAM)
- Power Running Board (PRB) module
- Smart Junction Box (SJB)
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
PINPOINT TEST V: INTERMITTENT NO MS-CAN COMMUNICATION, ONE OR MORE MODULES ARE NOT RESPONDING DURING NETWORK TEST
NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test. Inspection and Verification
NOTE: Various network DTCs set while disabling modules in this test procedure which need to be cleared after the diagnostic procedure is completed.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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V1 CHECK THE DLC PINS FOR DAMAGE
- Ignition OFF.
- Disconnect the scan tool cable from the Data Link Connector (DLC).
- Inspect the DLC pins 3 and 11 for damage.
- Are DLC pins 3 and 11 OK?
Yes
GO to V2.
No
REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
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V2 CHECK THE MS-CAN TERMINATION RESISTANCE
- Disconnect: Negative Battery Cable.
- Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side.
- Is the resistance between 54 and 66 ohms?
Yes
GO to V3.
No
CONNECT the negative battery cable. GO to Pinpoint Test W. Pinpoint Test W: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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V3 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND
- Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground.
- Are the resistances greater than 1,000 ohms?
Yes
CONNECT the negative battery cable. GO to V4.
No
CONNECT the negative battery cable. GO to Pinpoint Test W. Pinpoint Test W: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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V4 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure the voltage between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground.
- Is the voltage greater than 6 volts?
Yes
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
GO to V5.
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V5 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE SJB DISABLED
- Disconnect: Smart Junction Box (SJB) Fuse 5 (10A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other MS-CAN modules pass the network test?
Yes
INSTALL the removed fuse. GO to Pinpoint Test I. Pinpoint Test I: The Smart Junction Box (SJB) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to V6.
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V6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE PAM DISABLED
- Disconnect: SJB Fuse 35 (10A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other MS-CAN modules pass the network test?
Yes
INSTALL the removed fuse. GO to Pinpoint Test R. Pinpoint Test R: The Parking Aid Module (PAM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to V7.
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V7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ACM OR IN-DASH COMPUTER DISABLED
- Disconnect: SJB Fuse 39 (20A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other MS-CAN modules pass the network test?
Yes
INSTALL the removed fuse.
If the vehicle is equipped with an ACM, GO to Pinpoint Test K. Pinpoint Test K: The Audio Control Module (ACM) Does Not Respond To The Scan Tool
If the vehicle is equipped with an in-dash computer, GO to V24.
No
INSTALL the removed fuse.
If the vehicle is equipped with an audio Digital Signal Processing (DSP) module, GO to V8.
If the vehicle is not equipped with an audio DSP module, GO to V9.
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V8 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE AUDIO DSP MODULE DISABLED
- Disconnect: Battery Junction Box (BJB) Fuse 64 (30A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other MS-CAN modules pass the network test?
Yes
INSTALL the removed fuse. GO to Pinpoint Test L. Pinpoint Test L: The Audio Digital Signal Processing (DSP) Module Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to V9.
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V9 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IC, FCIM AND FDIM DISABLED
- Disconnect: SJB Fuses 26 (10A) and 29 (5A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other MS-CAN modules pass the network test?
Yes
INSTALL the removed fuses.
If the vehicle is equipped with an FCIM, GO to V10.
If the vehicle is not equipped with an FCIM, GO to V11.
No
INSTALL the removed fuses. GO to V12.
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V10 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE FCIM DISCONNECTED
- Disconnect: FCIM C2402.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other MS-CAN modules pass the network test?
Yes
CONNECT the FCIM. GO to Pinpoint Test M. Pinpoint Test M: The Front Controls Interface Module (FCIM) Does Not Respond To The Scan Tool
No
CONNECT the FCIM. GO to V11.
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V11 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IC DISCONNECTED
- Disconnect: IC C220.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other MS-CAN modules pass the network test?
Yes
CONNECT the IC. GO to Pinpoint Test C. Pinpoint Test C: The Instrument Cluster (IC) Does Not Respond To The Scan Tool
No
CONNECT the IC. GO to Pinpoint Test N. Pinpoint Test N: The Front Display Interface Module (FDIM) Does Not Respond To The Scan Tool
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V12 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE HVAC MODULE DISABLED
- Disconnect: SJB Fuse 15 (10A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other MS-CAN modules pass the network test?
Yes
INSTALL the removed fuse. GO to Pinpoint Test J. Pinpoint Test J: The HVAC Module Does Not Respond To The Scan Tool
No
INSTALL the removed fuse.
If the vehicle is equipped with an Accessory Protocol Interface Module (APIM), GO to V13.
If the vehicle is not equipped with an APIM, GO to V14.
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V13 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM DISABLED
- Disconnect: SJB Fuse 13 (5A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other MS-CAN modules pass the network test?
Yes
INSTALL the removed fuse. GO to Pinpoint Test U. Pinpoint Test U: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to V14.
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V14 VERIFY VEHICLE EQUIPMENT - PRB MODULE
- Verify whether the vehicle is equipped with a Power Running Board (PRB) module.
- Is the vehicle equipped with a PRB module?
Yes
GO to V15.
No
GO to V16.
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V15 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE PRB MODULE DISABLED
- Disconnect: Battery Junction Box (BJB) Fuse 11 (30A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other MS-CAN modules pass the network test?
Yes
INSTALL the removed fuse. GO to Pinpoint Test Q. Pinpoint Test Q: The Power Running Board (PRB) Module Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to V16.
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V16 VERIFY VEHICLE EQUIPMENT - DSM
- Verify whether the vehicle is equipped with a Driver Seat Module (DSM).
- Is the vehicle equipped with a DSM?
Yes
GO to V17.
No
GO to V18.
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V17 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE DSM DISABLED
- Disconnect: SJB Fuse 12 (7.5A) and Battery Junction Box (BJB) Fuse 74 (30A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other MS-CAN modules pass the network test?
Yes
INSTALL the removed fuses. GO to Pinpoint Test O. Pinpoint Test O: The Driver Seat Module (DSM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuses. GO to V18.
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V18 VERIFY VEHICLE EQUIPMENT - DCSM
- Verify whether the vehicle is equipped with a Dual Climate Controlled Seat Module (DCSM).
- Is the vehicle equipped with a DCSM?
Yes
GO to V19.
No
GO to V20.
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V19 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE DCSM DISABLED
- Disconnect: BJB Fuse 69 (30A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other MS-CAN modules pass the network test?
Yes
INSTALL the removed fuse. GO to Pinpoint Test P. Pinpoint Test P: The Dual Climate Controlled Seat Module (DCSM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. An intermittent fault is not present. GO to Pinpoint Test W. Pinpoint Test W: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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V20 VERIFY VEHICLE EQUIPMENT - GPSM
- Verify whether the vehicle is equipped with a Global Positioning System Module (GPSM).
- Is the vehicle equipped with a GPSM?
Yes
GO to V21.
No
GO to V22.
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V21 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE GPSM DISABLED
- Disconnect: SJB Fuse 11 (10A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other MS-CAN modules pass the network test?
Yes
INSTALL the removed fuse. GO to Pinpoint Test S. Pinpoint Test S: The Global Positioning System Module (GPSM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to V22.
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V22 VERIFY VEHICLE EQUIPMENT - ILCM
- Verify whether the vehicle is equipped with an Interior Lighting Control Module (ILCM).
- Is the vehicle equipped with an ILCM?
Yes
GO to V23.
No
An intermittent fault is not present. GO to Pinpoint Test W. Pinpoint Test W: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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V23 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ILCM DISABLED
- Disconnect: SJB Fuse 14 (10A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other MS-CAN modules pass the network test?
Yes
INSTALL the removed fuse. GO to Pinpoint Test T. Pinpoint Test T: The Interior Lighting Control Module (ILCM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. An intermittent fault is not present. GO to Pinpoint Test W. Pinpoint Test W: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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V24 CHECK FOR CORRECT IN-DASH COMPUTER OPERATION
- Disconnect all of the in-dash computer connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all of the in-dash computer connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new in-dash computer. REFER to Accessories and Optional Equipment. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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