Pinpoint Test L: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, One Or More Modules Are Not Respo
Communications Network
Pinpoint Tests
Pinpoint Test L: 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 (GY/OG) and VDB07 (VT/OG). The Audio Control Module (ACM), the Accessory Protocol Interface Module (APIM), the Front Controls Interface Module (FCIM), the Front Display Interface Module (FDIM), the HVAC module, the Smart Junction Box (SJB) and the Instrument Cluster (IC) all communicate on the 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.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
PINPOINT TEST L: 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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L1 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 L2.
No
REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
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L2 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 L3.
No
CONNECT the negative battery cable. Go To Pinpoint Test M. Pinpoint Test M: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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L3 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 L4.
No
CONNECT the negative battery cable. Go To Pinpoint Test M. Pinpoint Test M: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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L4 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 L5.
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L5 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: ACM C240a.
- 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 ACM. Go To Pinpoint Test K. Pinpoint Test K: The Audio Control Module (ACM) Does Not Respond To The Scan Tool
No
CONNECT the ACM. GO to L6.
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L6 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 J. Pinpoint Test J: The Smart Junction Box (SJB) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to L7.
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L7 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 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 I. Pinpoint Test I: The HVAC Module Does Not Respond To The Scan Tool
No
INSTALL the removed fuses. GO to L8.
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L8 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE FCIM AND FDIM 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 L9.
No
INSTALL the removed fuse. GO to L10.
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L9 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 H. Pinpoint Test H: The Front Display Interface Module (FDIM) Does Not Respond To The Scan Tool
No
CONNECT the FDIM. Go To Pinpoint Test G. Pinpoint Test G: The Front Controls Interface Module (FCIM) Does Not Respond To The Scan Tool
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L10 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 13 (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 F. Pinpoint Test F: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to L11.
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L11 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IC 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 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. GO to L12.
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L12 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IC DISCONNECTED
- Disconnect: IC C220.
- 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 IC. Go To Pinpoint Test C. Pinpoint Test C: The Instrument Cluster (IC) Does Not Respond To The Scan Tool
No
CONNECT the IC. An intermittent fault is not present. Go To Pinpoint Test M. Pinpoint Test M: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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