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
The Medium Speed Controller Area Network (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)
- Global Positioning System Module (GPSM) (if equipped)
- Circuit Deactivation Ignition Module (CDIM) (diesel engine only, if equipped)
- Rear Entertainment Module (RETM)
- Driver Seat Module (DSM)
- HVAC module
- Instrument Cluster (IC)
- Parking Aid Module (PAM)
- Satellite Digital Audio Receiver System (SDARS) module (if equipped)
- Smart Junction Box (SJB)
In the event that either MS-CAN circuit 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 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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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 Global Positioning System Module (GPSM) 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 Global Positioning System Module (GPSM) 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 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 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 fuses. GO to U6.
If the vehicle is not equipped with a RETM, INSTALL the removed fuses. 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 reverts 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 OR IN-DASH COMPUTER DISABLED
NOTE: When re-running the network test, the network test application must be first closed 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. For ACM, GO to Pinpoint Test K. Pinpoint Test K: The Audio Control Module (ACM) Does Not Respond To The Scan Tool
For in-dash computer, GO to U18.
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 reverts 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 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 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.
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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 reverts 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.
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U11 VERIFY VEHICLE EQUIPMENT - PAM
- Verify whether the vehicle is equipped with a PAM.
- Is the vehicle equipped with a PAM?
Yes
GO to U12.
No
GO to U13.
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U12 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE PAM DISABLED
NOTE: When re-running the network test, the network test application must be first closed or the screen display reverts back to the prior run network test results.
- Disconnect: PAM 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 O. Pinpoint Test O: The Parking Aid Module (PAM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to U13.
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U13 VERIFY VEHICLE EQUIPMENT - GPSM
- Verify whether the vehicle is equipped with a GPSM.
- Is the vehicle equipped with a GPSM?
Yes
GO to U14.
No
GO to U15.
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U14 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE GPSM DISABLED
NOTE: When re-running the network test, the network test application must be first closed or the screen display reverts 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
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 U15.
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U15 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 reverts 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 fuses. GO to U16.
If the vehicle is not equipped with an APIM and/or SDARS module, INSTALL the removed fuses. 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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U16 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 reverts 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 U17.
If the vehicle is equipped with an APIM only, INSTALL the removed fuse. GO to Pinpoint Test Q. Pinpoint Test Q: No ISO 9141 Communication Or The 4X4 Control Module 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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U17 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 reverts back to the prior run network test results.
- Disconnect: APIM C2298.
- 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: No ISO 9141 Communication Or The 4X4 Control Module 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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U18 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.
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