Pinpoint Test T: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, One Or More Modules Are Not Respo
Communications Network
Pinpoint Tests
Pinpoint Test T: 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 and provides the network connection to all modules on the network. In the event that one 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.
The following modules communicate with the scan tool using the MS-CAN:
- Accessory Protocol Interface Module (APIM) (if equipped)
- Audio Control Module (ACM)
- Audio Digital Signal Processing (DSP) module (if equipped)
- Driver Seat Module (DSM) (if equipped)
- Dual Climate Controlled Seat Module (DCSM) (if equipped)
- Global Positioning System Module (GPSM)
- HVAC module (if equipped)
- Instrument Cluster (IC)
- Liftgate/Trunk Module (LTM) (if equipped)
- Parking Aid Module (PAM) (if equipped)
- Satellite Digital Audio Receiver System (SDARS) module (if equipped)
- Smart Junction Box (SJB)
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
PINPOINT TEST T: 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 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.
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T1 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 T2.
No
REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
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T2 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 T3.
No
CONNECT the negative battery cable. GO to Pinpoint Test U. Pinpoint Test U: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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T3 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 T4.
No
CONNECT the negative battery cable. GO to Pinpoint Test U. Pinpoint Test U: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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T4 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 circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
GO to T5.
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T5 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE HVAC MODULE AND THE GPSM DISABLED
- 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. If the vehicle is equipped with a GPSM, GO to T6.
If the vehicle is not equipped with a GPSM, GO to Pinpoint Test J. Pinpoint Test J: The HVAC Module Does Not Respond To The Scan Tool
No
INSTALL the removed fuses. GO to T7.
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T6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE GPSM DISCONNECTED
- Disconnect: GPSM C2398.
- 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
CONNECT the GPSM. GO to Pinpoint Test P. Pinpoint Test P: The Global Positioning System Module (GPSM) Does Not Respond To The Scan Tool
No
CONNECT the GPSM. GO to Pinpoint Test J. Pinpoint Test J: The HVAC Module Does Not Respond To The Scan Tool
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T7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ACM DISABLED
- Disconnect: SJB Fuses 28 (5A), 39 (20A) and 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 fuses. GO to Pinpoint Test K. Pinpoint Test K: The Audio Control Module (ACM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuses. GO to T8.
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T8 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE SJB DISABLED
- 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 I. Pinpoint Test I: The Smart Junction Box (SJB) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to T9.
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T9 VERIFY VEHICLE EQUIPMENT - DSM
- Inspect the vehicle for a DSM.
- Is the vehicle equipped with a DSM?
Yes
GO to T10.
No
GO to T11.
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T10 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE DSM DISABLED
- Disconnect: BJB Fuse 60 (30A) and 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 fuses. GO to Pinpoint Test O. Pinpoint Test O: The Driver Seat Module (DSM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuses. GO to T11.
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T11 VERIFY VEHICLE EQUIPMENT - LTM
- Inspect the vehicle for an LTM.
- Is the vehicle equipped with an LTM?
Yes
GO to T12.
No
GO to T13.
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T12 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE LTM DISABLED
- Disconnect: BJB Fuse 59 (30A) and SJB Fuse 14 (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 N. Pinpoint Test N: The Liftgate/Trunk Module (LTM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuses. GO to T13.
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T13 VERIFY VEHICLE EQUIPMENT - APIM
- Inspect the vehicle for an APIM.
- Is the vehicle equipped with an APIM?
Yes
GO to T14.
No
GO to T17.
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T14 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM DISABLED
- 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 T15.
No
INSTALL the removed fuse. GO to T17.
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T15 VERIFY VEHICLE EQUIPMENT - AUDIO DSP MODULE
- Inspect the vehicle for an audio DSP module.
- Is the vehicle equipped with an audio DSP module?
Yes
GO to T16.
No
GO to T17.
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T16 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE AUDIO DSP MODULE DISABLED
- Disconnect: SJB Fuses 38 (20A) and 18 (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 fuses. 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 fuses. GO to T17.
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T17 VERIFY VEHICLE EQUIPMENT - DCSM
- Inspect the vehicle for a DCSM.
- Is the vehicle equipped with a DCSM?
Yes
GO to T18.
No
GO to T19.
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T18 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE DCSM DISABLED
- Disconnect: BJB Fuse 16 (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 Q. Pinpoint Test Q: The Dual Climate Controlled Seat Module (DCSM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to T19.
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T19 VERIFY VEHICLE EQUIPMENT - SDARS MODULE
- Inspect the vehicle for a SDARS module.
- Is the vehicle equipped with a SDARS module?
Yes
GO to T20.
No
GO to T21.
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T20 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE SDARS MODULE DISABLED
- 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 M. Pinpoint Test M: The Satellite Digital Audio Receiver System (SDARS) Module Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to T21.
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T21 VERIFY VEHICLE EQUIPMENT - PAM
- Inspect the vehicle for a PAM.
- Is the vehicle equipped with a PAM?
Yes
GO to T22.
No
GO to T23.
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T22 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE PAM DISABLED
- Disconnect: SJB 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 R. Pinpoint Test R: The Parking Aid Module (PAM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to T23.
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T23 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 modules pass the network test?
Yes
INSTALL the removed fuses. GO to Pinpoint Test H. Pinpoint Test H: The Instrument Cluster (IC) Does Not Respond To The Scan Tool
No
INSTALL the removed fuses. An intermittent fault is not present. GO to Pinpoint Test U. Pinpoint Test U: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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