Pinpoint Test R: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, One Or More Modules Are Not Respo
Communications Network
Pinpoint Tests
Pinpoint Test R: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, One Or More Modules Are Not Responding During Network Test
Refer to Wiring Diagram Set 14, Module Communications Network for schematic and connector information. Diagrams By Number
Normal Operation
An open circuit (MS-CAN + or 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:
- Accessory Protocol Interface Module (APIM)
- Audio Control Module (ACM)
- Driver Seat Module (DSM)
- Global Positioning System Module (GPSM)
- HVAC module
- Instrument Cluster (IC)
- Parking Aid Module (PAM)
- Power Running Board (PRB) module
- Rear Entertainment Module (RETM)
- 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 R: INTERMITTENT NO MS-CAN COMMUNICATION, ONE OR MORE MODULES ARE NOT RESPONDING DURING NETWORK TEST
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 will set while disabling modules in this test procedure which will 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.
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R1 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 R2.
No
REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
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R2 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 R3.
No
CONNECT the negative battery cable. GO to Pinpoint Test S. Pinpoint Test S: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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R3 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 R4.
No
CONNECT the negative battery cable. GO to Pinpoint Test S. Pinpoint Test S: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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R4 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 in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
GO to R5.
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R5 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE HVAC MODULE DISABLED
- Disconnect: SJB Fuses 20 (10A) and 28 (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 R6.
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R6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ACM AND GPSM DISABLED
- Disconnect: SJB Fuses 3 (20A) and 12 (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 R7.
No
INSTALL the removed fuses. GO to R8.
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R7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ACM DISCONNECTED
- Disconnect: ACM C290b.
- 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 J. Pinpoint Test J: The Audio Control Module (ACM) Does Not Respond To The Scan Tool
No
CONNECT the ACM. GO to Pinpoint Test P. Pinpoint Test P: The Global Positioning System Module (GPSM) Does Not Respond To The Scan Tool
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R8 VERIFY VEHICLE EQUIPMENT - DSM
- Inspect the vehicle for a DSM.
- Is the vehicle equipped with a DSM?
Yes
GO to R9.
No
GO to R10.
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R9 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE DSM DISABLED
- Disconnect: SJB Fuse 1 (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 M. Pinpoint Test M: The Driver Seat Module (DSM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to R10.
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R10 VERIFY VEHICLE EQUIPMENT - PRB MODULE
- Inspect the vehicle for power running boards.
- Is the vehicle equipped with power running boards?
Yes
GO to R11.
No
GO to R12.
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R11 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE PRB MODULE DISABLED
- Disconnect: BJB Fuse 19 (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 fuse. GO to Pinpoint Test N. Pinpoint Test N: The Power Running Board Module Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to R12.
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R12 VERIFY VEHICLE EQUIPMENT - RETM, APIM AND/OR SDARS MODULE
- Inspect the vehicle for an RETM, an APIM, and/or a SDARS module.
- Is the vehicle equipped with an RETM, an APIM and/or a SDARS module?
Yes
GO to R13.
No
GO to R17.
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R13 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE RETM, APIM, AND/OR 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: BJB Fuse 41 (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 two or more of the following modules: RETM, APIM, SDARS module, GO to R14.
For vehicles equipped with an RETM only, GO to Pinpoint Test L. Pinpoint Test L: The Rear Entertainment Module (RETM) Does Not Respond To The Scan Tool
For vehicles equipped with an APIM only, GO to Pinpoint Test Q. Pinpoint Test Q: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool
For vehicles equipped with a SDARS module only, GO to Pinpoint Test K. Pinpoint Test K: The Satellite Digital Audio Receiver System (SDARS) Module Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to R17.
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R14 VERIFY VEHICLE EQUIPMENT - RETM
- Inspect the vehicle for an RETM.
- Is the vehicle equipped with an RETM?
Yes
GO to R15.
No
GO to R16.
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R15 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE RETM DISCONNECTED
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: 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 L. Pinpoint Test L: The Rear Entertainment Module (RETM) Does Not Respond To The Scan Tool
No
GO to R16.
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R16 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM DISCONNECTED
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: 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 K. Pinpoint Test K: The Satellite Digital Audio Receiver System (SDARS) Module Does Not Respond To The Scan Tool
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R17 VERIFY VEHICLE EQUIPMENT - PAM
- Inspect the vehicle for a PAM.
- Is the vehicle equipped with a PAM?
Yes
GO to R18.
No
GO to R19.
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R18 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE PAM DISABLED
- Disconnect: SJB Fuse 18 (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 O. Pinpoint Test O: The Parking Aid Module (PAM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to R19.
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R19 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IC 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 8 (15A) and 24 (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 G. Pinpoint Test G: The IC Does Not Respond To The Scan Tool
No
INSTALL the removed fuses. An intermittent fault is not present. GO to Pinpoint Test S. Pinpoint Test S: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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