Pinpoint Test N: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, One Or More Modules Are Not Respo
Communications Network
Pinpoint Tests
Pinpoint Test N: 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. 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.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
PINPOINT TEST N: INTERMITTENT NO MS-CAN COMMUNICATION, ONE OR MORE MODULES ARE NOT RESPONDING DURING NETWORK TEST
NOTE: Various modules set network DTCs during this test procedure. Clear DTCs from all modules after the diagnostic procedure is completed.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery, Mounting and Cables Battery Disconnect.
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N1 CHECK THE DLC PINS FOR DAMAGE
- Ignition OFF.
- Disconnect the scan tool cable from the DLC.
- Inspect DLC pins 3 and 11 for damage.
- Are DLC pins 3 and 11 OK?
Yes
GO to N2.
No
REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
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N2 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 N3.
No
CONNECT the negative battery cable. GO to Pinpoint Test M. Pinpoint Test M: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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N3 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 N4.
No
CONNECT the negative battery cable. GO to Pinpoint Test M. Pinpoint Test M: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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N4 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.
- Are the voltages greater than 6 volts?
Yes
REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
GO to N5.
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N5 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ACM, FCIM AND FDIM DISABLED
NOTE: When re-running the network test, the network test application must be closed first or the screen display reverts back to the prior run network test results.
- Disconnect: SJB Fuse 39 (20A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other modules pass the network test?
Yes
INSTALL the removed fuse. GO to N6.
No
INSTALL the removed fuse. GO to N7.
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N6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ACM, FCIM OR FDIM DISCONNECTED
NOTE: When re-running the network test, the network test application must be first closed or the screen display reverts back to the prior run network test results.
- Disconnect modules one at a time until other MS-CAN modules pass the network test. Skip to the end once network operation is restored.
- Disconnect: Audio Control Module (ACM) C240a.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Disconnect: Front Controls Interface Module (FCIM) C2402.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Disconnect: Front Display Interface Module (FDIM) C2123.
- 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 all modules.
For restored operation with the ACM disconnected, GO to Pinpoint Test K. Pinpoint Test K: The Audio Control Module (ACM) Does Not Respond To The Scan Tool
For restored operation with the FCIM disconnected, GO to Pinpoint Test G. Pinpoint Test G: The Front Controls Interface Module (FCIM) Does Not Respond To The Scan Tool
For restored operation with the FDIM disconnected, GO to Pinpoint Test H. Pinpoint Test H: The Front Display Interface Module (FDIM) Does Not Respond To The Scan Tool
No
An intermittent fault is not present. GO to Pinpoint Test M. Pinpoint Test M: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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N7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE SJB DISABLED
NOTE: When re-running the network test, the network test application must be closed first or the screen display reverts back to the prior run network test results.
- Disconnect: SJB Fuse 5 (10A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other modules pass the network test?
Yes
INSTALL the removed fuse. GO to Pinpoint Test J. Pinpoint Test J: The Smart Junction Box (SJB) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to N8.
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N8 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE HVAC MODULE DISABLED
NOTE: When re-running the network test, the network test application must be closed first or the screen display reverts back to the prior run network test results.
- Disconnect: SJB Fuses 15 (10A) and 37 (10A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other modules pass the network test?
Yes
INSTALL the removed fuses. GO to Pinpoint Test I. Pinpoint Test I: The HVAC Module Does Not Respond To The Scan Tool
No
INSTALL the removed fuses. GO to N9.
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N9 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM DISABLED
NOTE: When re-running the network test, the network test application must be closed first or the screen display reverts back to the prior run network test results.
- Disconnect: SJB Fuse 13 (7.5A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other modules pass the network test?
Yes
INSTALL the removed fuse. GO to Pinpoint Test F. Pinpoint Test F: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to N10.
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N10 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE GPSM DISABLED
NOTE: When re-running the network test, the network test application must be closed first or the screen display reverts back to the prior run network test results.
- Disconnect: SJB Fuse 16 (15A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other modules pass the network test?
Yes
INSTALL the removed fuse. GO to Pinpoint Test L. Pinpoint Test L: The Global Positioning System Module (GPSM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to N11.
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N11 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IC DISABLED
NOTE: When re-running the network test, the network test application must be closed first or the screen display reverts back to the prior run network test results.
- 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 modules pass the network test?
Yes
INSTALL the removed fuses. GO to Pinpoint Test C. Pinpoint Test C: The Instrument Cluster (IC) Does Not Respond To The Scan Tool
No
INSTALL the removed fuses. An intermittent fault is not present. GO to Pinpoint Test M. Pinpoint Test M: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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