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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, 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:

- Audio Control Module (ACM)
- Accessory Protocol Interface Module (APIM) (if equipped)
- Body Control Module B (BCM-B)
- Front Controls Interface Module (FCIM)
- Front Display Interface Module (FDIM)
- Global Positioning System Module (GPSM)
- HVAC module
- Instrument Panel Cluster (IPC)
- Smart Junction Box (SJB)

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 will 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.

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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 O. Pinpoint Test O: 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 O. Pinpoint Test O: 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 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 Pinpoint Test I. Pinpoint Test I: The Audio Control Module (ACM) Does Not Respond To The Scan Tool

No
INSTALL the removed fuse. GO to N6.

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N6 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 F. Pinpoint Test F: The Smart Junction Box (SJB) Does Not Respond To The Scan Tool

No
INSTALL the removed fuse. GO to N7.

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N7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE BCM-B 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: BJB Fuse 18 (10A) and SJB Fuse 35 (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 G. Pinpoint Test G: The Body Control Module B (BCM-B) Does Not Respond To The Scan Tool

No
INSTALL the removed fuses. 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 Fuse 15 (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 H. Pinpoint Test H: The HVAC Module Does Not Respond To The Scan Tool

No
INSTALL the removed fuse. GO to N9.

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N9 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE FCIM, FDIM AND 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 14 (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 N10.

No
INSTALL the removed fuse. GO to N11.

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N10 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE FCIM 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: FCIM C2402.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other modules pass the network test?

Yes
CONNECT the FCIM. If the vehicle is not equipped with an FDIM or a GPSM, GO to Pinpoint Test J. Pinpoint Test J: The Front Controls Interface Module (FCIM) Does Not Respond To The Scan Tool

If the vehicle is equipped with an FDIM only, GO to Pinpoint Test K. Pinpoint Test K: The Front Display Interface Module (FDIM) Does Not Respond To The Scan Tool

If the vehicle is equipped with a GPSM only, GO to Pinpoint Test L. Pinpoint Test L: The Global Positioning System Module (GPSM) Does Not Respond To The Scan Tool

If the vehicle is equipped with both an FDIM and a GPSM,
GO to N10.

No
CONNECT the FCIM. GO to N12.

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N11 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE FDIM DISCONNECTED


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: FDIM C2123.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other modules pass the network test?

Yes
CONNECT the FDIM. GO to Pinpoint Test K. Pinpoint Test K: The Front Display Interface Module (FDIM) Does Not Respond To The Scan Tool

No
CONNECT the FDIM. GO to Pinpoint Test L. Pinpoint Test L: The Global Positioning System Module (GPSM) Does Not Respond To The Scan Tool

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N12 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 3 (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 M. Pinpoint Test M: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool

No
INSTALL the removed fuse. GO to N13.

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N13 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IPC 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 36 (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 Panel Cluster (IPC) Does Not Respond To The Scan Tool

No
INSTALL the removed fuses. GO to N13.

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