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Pinpoint Test U: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, One Or More Modules Are Not Respo




Communications Network

Pinpoint Tests

Pinpoint Test U: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, One Or More Modules Are Not Responding During Network Test

Normal Operation

An open circuit VDB06 (GY/OG) (MS-CAN +) or VDB07 (VT/OG) (MS-CAN -) may cause intermittent or unreliable communication to all modules on the Medium Speed Controller Area Network (MS-CAN). The MS-CAN is used for communication between the following modules:

This pinpoint test is intended to diagnose the following:

- Accessory Protocol Interface Module (APIM)
- Audio Control Module (ACM)
- Circuit Deactivation Ignition Module (CDIM) (diesel engine only, if equipped)
- Rear Entertainment Module (RETM)
- Driver Seat Module (DSM)
- HVAC module
- Instrument Cluster (IC)
- Satellite Digital Audio Receiver System (SDARS) module (if equipped)
- Smart Junction Box (SJB)

In the event that either circuit VDB06 (GY/OG) or VDB07 (VT/OG) becomes open to any module on the network, unreliable network communication to all modules on the network may result.



PINPOINT TEST U: 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.

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U1 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 U2.

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

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U2 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 U3.

No
Go To Pinpoint Test P. Pinpoint Test P: The 4X4 Control Module Does Not Respond To The Scan Tool

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U3 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 5,000 ohms?

Yes
CONNECT the negative battery cable. GO to U4.

No
Go To Pinpoint Test P. Pinpoint Test P: The 4X4 Control Module Does Not Respond To The Scan Tool

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U4 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 short to voltage. CLEAR the DTCs. REPEAT the network test with the scan tool.

No
GO to U5.

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U5 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 J. Pinpoint Test J: The HVAC Module Does Not Respond To The Scan Tool

No
If the vehicle is equipped with a RETM, INSTALL the removed fuse. GO to U6.

If the vehicle is not equipped with a RETM, INSTALL the removed fuse. GO to U7.

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U6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE RETM 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. Go To Pinpoint Test L. Pinpoint Test L: The Rear Entertainment Module (RETM) Does Not Respond To The Scan Tool

No
INSTALL the removed fuse. GO to U7.

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U7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE 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 K. Pinpoint Test K: The Audio Control Module (ACM) Does Not Respond To The Scan Tool

No
If the vehicle is equipped with a DSM, INSTALL the removed fuse. GO to U8.

If the vehicle is not equipped with a DSM, INSTALL the removed fuse. GO to U9.

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U8 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE 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 Fuse 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 fuse. Go To Pinpoint Test I. Pinpoint Test I: The Driver Seat Module (DSM) Does Not Communicate With The Scan Tool

No
INSTALL the removed fuse. GO to U9.

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U9 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE 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
If the vehicle is equipped with a CDIM, INSTALL the removed fuse. GO to U10.

If the vehicle is not equipped with a CDIM, INSTALL the removed fuse. GO to U11.

-------------------------------------------------
U10 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE CDIM 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 27 (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 N. Pinpoint Test N: The Circuit Deactivation Ignition Module (CDIM) Does Not Communicate With The Scan Tool

No
INSTALL the removed fuse. GO to U11.

-------------------------------------------------
U11 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 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 Cluster (IC) Does Not Respond To The Scan Tool

No
If the vehicle is equipped with an APIM and/or SDARS module, INSTALL the removed fuse. GO to U12.

If the vehicle is not equipped with an APIM and/or SDARS module, INSTALL the removed fuse. An intermittent fault is not present. Go To Pinpoint Test V. Pinpoint Test V: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding

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U12 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM 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 40 (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
If the vehicle is equipped with both an APIM and a SDARS module, INSTALL the removed fuse. GO to U13.

If the vehicle is equipped with an APIM only, INSTALL the removed fuse. Go To Pinpoint Test Q. Pinpoint Test Q: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool

If the vehicle is equipped with a SDARS module only, INSTALL the removed fuse. 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. An intermittent fault is not present. Go To Pinpoint Test V. Pinpoint Test V: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding

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U13 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 Q. Pinpoint Test Q: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool

No
CONNECT the APIM. 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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