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Pinpoint Test T: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, Communication Can Be Intermittent




Communications Network

Pinpoint Tests

Pinpoint Test T: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, Communication Can Be Intermittently Established

Normal Operation

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

- Audio Control Module (ACM)
- Accessory Protocol Interface Module (APIM)
- Rear Entertainment Module (RETM)
- Driver Seat Module (DSM)
- HVAC module
- Instrument Cluster (IC)
- Liftgate/Trunk Module (LTM)
- Satellite Digital Audio Receiver System (SDARS) module
- Smart Junction Box (SJB)

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 T: PINPOINT TEST T: INTERMITTENT NO MS-CAN COMMUNICATION, COMMUNICATION CAN BE INTERMITTENTLY ESTABLISHED

NOTE: Various modules will set network DTCs during this test procedure. Clear DTCs from all modules after the diagnostic procedure is completed.

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T1 CHECK THE DATA LINK CONNECTOR (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 T2.

No
REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.

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T2 CHECK THE MS-CAN TERMINATION RESISTANCE


- NOTE: Failure to disconnect the battery will result in false resistance readings.
- Disconnect the battery ground 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 T3.

No
Go To Pinpoint Test R. Pinpoint Test R: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, Communication Can Be Intermittently

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T3 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
GO to T4.

No
Go To Pinpoint Test R. Pinpoint Test R: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, Communication Can Be Intermittently

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T4 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE


- Connect the battery ground cable.
- 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. CLEAR the DTCs. REPEAT the network test with the scan tool.

No
GO to T5.

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T5 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE SMART JUNCTION BOX (SJB) DISABLED


NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert 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 H. Pinpoint Test H: The Smart Junction Box (SJB) Does Not Respond To The Scan Tool

No
INSTALL the removed fuse. GO to T6.

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T6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE HVAC MODULE DISABLED


NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert 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 N. Pinpoint Test N: The HVAC Module Does Not Respond To The Scan Tool

No
INSTALL the removed fuses. GO to T7.

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T7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE AUDIO CONTROL MODULE (ACM) DISABLED


NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert 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 T8.

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T8 VERIFY VEHICLE EQUIPMENT - DSM


- Inspect the vehicle for a DSM.
- Is the vehicle equipped with a DSM?

Yes
GO to T9.

No
GO to T10.

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T9 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE DRIVER SEAT MODULE (DSM) DISABLED


NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results.

- Disconnect: SJB Fuses 32 (30A) and 12 (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 fuses. Go To Pinpoint Test J. Pinpoint Test J: The Driver Seat Module (DSM) Does Not Respond To The Scan Tool

No
INSTALL the removed fuses. GO to T10.

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T10 VERIFY VEHICLE EQUIPMENT - LTM


- Inspect the vehicle for a LTM.
- Is the vehicle equipped with a LTM?

Yes
GO to T11.

No
GO to T12.

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T11 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE LIFTGATE/TRUNK MODULE (LTM) DISABLED


NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results.

- Disconnect: SJB Fuses 14 (10A) and 29 (30A).
- 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 L. Pinpoint Test L: The Liftgate/Trunk Module (LTM) Does Not Communicate With The Scan Tool

No
INSTALL the removed fuses. GO to T12.

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T12 VERIFY VEHICLE EQUIPMENT - ACCESSORY PROTOCOL INTERFACE MODULE (APIM), REAR ENTERTAINMENT MODULE (RETM) AND/OR SATELLITE DIGITAL AUDIO RECEIVER SYSTEM (SDARS) MODULE


- Inspect the vehicle for an APIM, RETM and/or a SDARS module.
- Is the vehicle equipped with an APIM, RETM and/or a SDARS module?

Yes
GO to T13.

No
GO to T15.

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T13 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE RETM AND/OR SDARS MODULE DISABLED


NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert 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. For vehicles equipped with 2 or more of the following modules: APIM, RETM or SDARS module, GO to T14.

For vehicles equipped with an APIM only, Go To Pinpoint Test O. Pinpoint Test O: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool

For vehicles equipped with a RETM only, Go To Pinpoint Test K. Pinpoint Test K: The Rear Entertainment Module (RETM) Does Not Respond To The Scan Tool

For vehicles equipped with a SDARS module only, Go To Pinpoint Test M. Pinpoint Test M: The Satellite Digital Audio Receiver System (SDARS) Module Does Not Respond To The Scan Tool

No
INSTALL the removed fuse. GO to T17.

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T14 VERIFY VEHICLE EQUIPMENT - APIM


- Inspect the vehicle for an APIM.
- Is the vehicle equipped with an APIM?

Yes
GO to T15.

No
GO to T16.

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T15 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM DISCONNECTED


NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results.

- Disconnect: APIM C3342.
- 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 APIM. Go To Pinpoint Test O. Pinpoint Test O: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool

No
CONNECT the APIM. If the vehicle is equipped with a RETM, Go To Pinpoint Test K. Pinpoint Test K: The Rear Entertainment Module (RETM) Does Not Respond To The Scan Tool

Otherwise, Go To Pinpoint Test M. Pinpoint Test M: The Satellite Digital Audio Receiver System (SDARS) Module Does Not Respond To The Scan Tool

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T16 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE RETM DISCONNECTED


NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results.

- Disconnect: RETM C9029.
- 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 RETM. Go To Pinpoint Test K. Pinpoint Test K: The Rear Entertainment Module (RETM) Does Not Respond To The Scan Tool

No
CONNECT the RETM. Go To Pinpoint Test M. Pinpoint Test M: The Satellite Digital Audio Receiver System (SDARS) Module Does Not Respond To The Scan Tool

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T17 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IC DISABLED


NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert 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 U. Pinpoint Test U: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding

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