Pinpoint Test W: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, Communication Can Be Intermittent
Communications Network
Pinpoint Tests
Pinpoint Test W: 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 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 can result.
The following modules communicate with the scan tool using the MS-CAN:
- Audio Control Module (ACM)
- Accessory Protocol Interface Module (APIM)
- Audio Digital Signal Processing (DSP) module
- Driver Seat Module (DSM)
- Front Controls Interface Module (FCIM)
- Front Display Interface Module (FDIM)
- Global Positioning System Module (GPSM)
- HVAC module
- Instrument Cluster (IC)
- Liftgate/Trunk Module (LTM)
- Rear Entertainment Module (RETM)
- Smart Junction Box (SJB)
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
PINPOINT TEST W: INTERMITTENT NO MS-CAN COMMUNICATION, COMMUNICATION CAN BE INTERMITTENTLY ESTABLISHED
NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test. Inspection and Verification
NOTE: Various network DTCs set while disabling modules in this test procedure, which need to be cleared 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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W1 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 W2.
No
REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
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W2 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 W3.
No
GO to Pinpoint Test X. Pinpoint Test X: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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W3 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 W4.
No
GO to Pinpoint Test X. Pinpoint Test X: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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W4 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE
- Connect: Negative Battery 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 in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
GO to W5.
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W5 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE SJB DISABLED
- Disconnect: Smart Junction Box (SJB) Fuse 5 (10A).
- 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
INSTALL the removed fuse. GO to Pinpoint Test R. Pinpoint Test R: The Smart Junction Box (SJB) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to W6.
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W6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ACM DISABLED
- Disconnect: SJB Fuse 39 (20A).
- 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
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
INSTALL the removed fuse. If the vehicle is equipped with an audio DSP module, GO to W7.
If the vehicle is not equipped with an audio DSP module, GO to W8.
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W7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE AUDIO DSP MODULE DISABLED
- Disconnect: Battery Junction Box (BJB) Fuse 7 (30A).
- 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
INSTALL the removed fuse. GO to Pinpoint Test L. Pinpoint Test L: The Audio Digital Signal Processing (DSP) Module Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to W8.
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W8 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM, FDIM, GPSM, LTM AND RETM DISABLED
- Disconnect: SJB Fuse 14 (10A).
- 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
INSTALL the removed fuse. GO to W9.
No
INSTALL the removed fuse. GO to W10.
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W9 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM, FDIM, GPSM, LTM AND RETM DISCONNECTED
- Disconnect: APIM C3342 (If Equipped).
- Enter the following diagnostic mode on the scan tool: Network Test.
- If all other HS-CAN modules pass the network test, skip to end of test step. Otherwise, continue.
- Disconnect: FDIM C2123 (If Equipped).
- Enter the following diagnostic mode on the scan tool: Network Test.
- If all other HS-CAN modules pass the network test, skip to end of test step. Otherwise, continue.
- Disconnect: GPSM C2300 (If Equipped).
- Enter the following diagnostic mode on the scan tool: Network Test.
- If all other HS-CAN modules pass the network test, skip to end of test step. Otherwise, continue.
- Disconnect: LTM C4174a (If Equipped).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test. If all other HS-CAN modules pass the network test, skip to end of test step. Otherwise, continue.
- Disconnect: RETM C2949b (If Equipped).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other HS-CAN modules pass the network test?
Yes
CONNECT all modules.
For APIM, GO to Pinpoint Test T. Pinpoint Test T: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool
For FDIM, GO to Pinpoint Test N. Pinpoint Test N: The Front Display Interface Module (FDIM) Does Not Respond To The Scan Tool
For GPSM, GO to Pinpoint Test S. Pinpoint Test S: The Global Positioning System Module (GPSM) Does Not Respond To The Scan Tool
For LTM, GO to Pinpoint Test Q. Pinpoint Test Q: The Liftgate/Trunk Module (LTM) Does Not Respond To The Scan Tool
For RETM, GO to Pinpoint Test P. Pinpoint Test P: The Rear Entertainment Module (RETM) Does Not Respond To The Scan Tool
No
An intermittent fault is not present. GO to Pinpoint Test X. Pinpoint Test X: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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W10 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE HVAC MODULE DISABLED
- Disconnect: SJB Fuse 15 (10A).
- 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
INSTALL the removed fuse. GO to Pinpoint Test J. Pinpoint Test J: The HVAC Module Does Not Respond To The Scan Tool
No
INSTALL the removed fuse.
If the vehicle is equipped with a DSM, GO to W11.
If the vehicle is not equipped with a DSM, GO to W12.
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W11 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE DSM DISABLED
- Disconnect: BJB Fuse 32 (30A).
- 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
INSTALL the removed fuse. GO to Pinpoint Test O. Pinpoint Test O: The Driver Seat Module (DSM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to W12.
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W12 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE FCIM DISABLED
- Disconnect: Front Controls Interface Module (FCIM) Fuse 16 (15A).
- 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
INSTALL the removed fuse. GO to Pinpoint Test M. Pinpoint Test M: The Front Controls Interface Module (FCIM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to W13.
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W13 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IC DISABLED
- 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 MS-CAN 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. GO to Pinpoint Test X. Pinpoint Test X: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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