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




Communications Network

Pinpoint Tests

Pinpoint Test M: 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. In the event that one 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 M: 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.

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.

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M1 CHECK THE DLC PINS FOR DAMAGE


- Ignition OFF.
- Disconnect the scan tool cable from the Data Link Connector (DLC).
- Inspect DLC pins 3 and 11 for damage.




- Are DLC pins 3 and 11 OK?

Yes
GO to M2.

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

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M2 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 M3.

No
CONNECT the negative battery cable. GO to Pinpoint Test L. Pinpoint Test L: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding

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M3 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 M4.

No
CONNECT the negative battery cable. GO to Pinpoint Test L. Pinpoint Test L: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding

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M4 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 on either circuit?

Yes
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.

No
For stripped chassis, GO to M12.

Otherwise, GO to M5.

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M5 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ACM OR IN-DASH COMPUTER DISABLED


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

- Disconnect: For ACM, SJB Fuse 39 (20A) and 41 (15A) (Without Navigation).
- Disconnect: For In-Dash Computer, SJB Fuse 28 (5A) and 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 fuses. For ACM, GO to Pinpoint Test G. For in-dash computer, GO to M14. Pinpoint Test G: The Audio Control Module (ACM) Does Not Respond To The Scan Tool

No
If the vehicle is equipped with a Accessory Protocol Interface Module (APIM) and a Global Positioning System Module (GPSM), INSTALL the removed fuses. GO to M6.

If the vehicle is not equipped with a APIM and a GPSM, INSTALL the removed fuses. GO to M8.

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M6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM AND THE GPSM DISABLED


NOTE: When re-running the network test, the network test application must first be closed 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 M7.

No
INSTALL the removed fuse. GO to M8.

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M7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM DISCONNECTED


- Disconnect: APIM C2383.
- 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 K. Pinpoint Test K: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool

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

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M8 VERIFY VEHICLE EQUIPMENT - PARKING AID MODULE (PAM)


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

Yes
GO to M9.

No
GO to M10.

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M9 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE PAM DISABLED


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

- Disconnect: 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 fuse. GO to Pinpoint Test H. Pinpoint Test H: The Parking Aid Module (PAM) Does Not Respond To The Scan Tool

No
INSTALL the removed fuse. GO to M10.

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M10 VERIFY VEHICLE EQUIPMENT - SATELLITE DIGITAL AUDIO RECEIVER SYSTEM (SDARS) MODULE


- Inspect the vehicle for a SDARS module.
- Is the vehicle equipped with a SDARS module?

Yes
GO to M11.

No
GO to M12.

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M11 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE SDARS MODULE DISABLED


NOTE: When re-running the network test, the network test application must first be closed 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 I. Pinpoint Test I: The Satellite Digital Audio Receiver System (SDARS) Module Does Not Respond To The Scan Tool

No
INSTALL the removed fuse. GO to M12.

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M12 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE SJB DISABLED


NOTE: When re-running the network test, the network test application must first be closed 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 fuses. GO to M13.

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M13 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IPC DISABLED


NOTE: When re-running the network test, the network test application must first be closed 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 Panel Cluster (IPC) Does Not Respond To The Scan Tool

No
INSTALL the removed fuses. An intermittent fault is not present. GO to Pinpoint Test L. Pinpoint Test L: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding

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M14 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. CLEAR the DTCs. REPEAT the network test with the scan tool.

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