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) uses an unshielded twisted pair cable. (HS-CAN +) and (HS-CAN -) provide the network connection to all modules on the network.
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 U: 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, Mounting and Cables Battery Disconnect.
-------------------------------------------------
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.
-------------------------------------------------
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
CONNECT the negative battery cable. GO to Pinpoint Test V. Pinpoint Test V: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
-------------------------------------------------
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 1,000 ohms?
Yes
CONNECT the negative battery cable. GO to U4.
No
CONNECT the negative battery cable. GO to Pinpoint Test V. Pinpoint Test V: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
-------------------------------------------------
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 circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
GO to U5.
-------------------------------------------------
U5 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE HVAC MODULE AND 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 Global Positioning System Module (GPSM), GO to U6.
If the vehicle is not equipped with a GPSM, 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 U7.
-------------------------------------------------
U6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE HVAC MODULE DISCONNECTED
- Disconnect: HVAC module C2357a EMTC or C228a EATC.
- 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 HVAC module. GO to Pinpoint Test i. Pinpoint Test I: The HVAC Module Does Not Respond To The Scan Tool
No
CONNECT the HVAC module. GO to Pinpoint Test t. Pinpoint Test T: The Global Positioning System Module (GPSM) Does Not Respond To The Scan Tool
-------------------------------------------------
U7 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 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. GO to U8.
-------------------------------------------------
U8 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 H. Pinpoint Test H: The Smart Junction Box (SJB) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to U9.
-------------------------------------------------
U9 VERIFY VEHICLE EQUIPMENT - DSM
- Inspect the vehicle for a DSM.
- Is the vehicle equipped with a DSM?
Yes
GO to U10.
No
GO to U11.
-------------------------------------------------
U10 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE DSM DISABLED
- Disconnect: SJB Fuse 2 (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 Q. Pinpoint Test Q: The Power Running Board (PRB) Module Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to U11.
-------------------------------------------------
U11 VERIFY VEHICLE EQUIPMENT - LTM
- Inspect the vehicle for a Liftgate/Trunk Module (LTM).
- Is the vehicle equipped with an LTM?
Yes
GO to U12.
No
GO to U13.
-------------------------------------------------
U12 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE LTM DISABLED
- Disconnect: Battery Junction Box (BJB) Fuse 36 (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 J. Pinpoint Test J: The Liftgate/Trunk Module (LTM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuses. GO to U13.
-------------------------------------------------
U13 VERIFY VEHICLE EQUIPMENT - AUDIO RCU MODULE AND SDARS MODULE
- Inspect the vehicle for an audio Rear Control Unit (RCU) module and/or a Satellite Digital Audio Receiver System (SDARS) module.
- Is the vehicle equipped with any of the following: an audio RCU module, and/or a SDARS module?
Yes
GO to U14.
No
GO to U17.
-------------------------------------------------
U14 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE AUDIO RCU MODULE AND SDARS MODULE 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 U15.
No
INSTALL the removed fuse. GO to U17.
-------------------------------------------------
U15 VERIFY VEHICLE EQUIPMENT - SDARS MODULE
- Inspect the vehicle for a SDARS module.
- Is the vehicle equipped with a SDARS module?
Yes
GO to U16.
No
GO to Pinpoint Test N. Pinpoint Test N: The Audio Rear Control Unit (RCU) Module Does Not Respond To The Scan Tool
-------------------------------------------------
U16 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE SDARS MODULE DISABLED
- Disconnect: SDARS Module C3290.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other modules pass the network test?
Yes
GO to Pinpoint Test M. Pinpoint Test M: The Satellite Digital Audio Receiver System (SDARS) Module Does Not Respond To The Scan Tool
No
GO to Pinpoint Test N. Pinpoint Test N: The Audio Rear Control Unit (RCU) Module Does Not Respond To The Scan Tool
-------------------------------------------------
U17 VERIFY VEHICLE EQUIPMENT - AUDIO DSP MODULE
- Inspect the vehicle for an audio Digital Signal Processing (DSP) module.
- Is the vehicle equipped with an audio DSP module?
Yes
GO to U18.
No
GO to U19.
-------------------------------------------------
U18 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE AUDIO DSP MODULE DISABLED
- Disconnect: SJB Fuse 38 (20A) and 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 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 U19.
-------------------------------------------------
U19 VERIFY VEHICLE EQUIPMENT - DCSM
- Inspect the vehicle for a Dual Climate Controlled Seat Module (DCSM).
- Is the vehicle equipped with a DCSM?
Yes
GO to U20.
No
GO to U21.
-------------------------------------------------
U20 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE DCSM DISABLED
- Disconnect: BJB Fuse 67 (40A).
- 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 P. Pinpoint Test P: The Dual Climate Controlled Seat Module (DCSM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to U21.
-------------------------------------------------
U21 VERIFY VEHICLE EQUIPMENT - PRB MODULE
- Inspect the vehicle for a Power Running Board (PRB) module.
- Is the vehicle equipped with a PRB module?
Yes
GO to U22.
No
GO to U23.
-------------------------------------------------
U22 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE PRB MODULE DISABLED
- Disconnect: BJB Fuse 11 (40A).
- 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 Power Running Board (PRB) Module Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to U23.
-------------------------------------------------
U23 VERIFY VEHICLE EQUIPMENT - PAM
- Inspect the vehicle for a Parking Aid Module (PAM).
- Is the vehicle equipped with a PAM?
Yes
GO to U24.
No
GO to U25.
-------------------------------------------------
U24 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 U25.
-------------------------------------------------
U25 VERIFY VEHICLE EQUIPMENT - APIM
- Inspect the vehicle for a Accessory Protocol Interface Module (APIM).
- Is the vehicle equipped with APIM?
Yes
GO to U26.
No
GO to U27.
-------------------------------------------------
U26 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM DISABLED
- 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 S. Pinpoint Test S: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool
No
CONNECT the APIM. GO to U27.
-------------------------------------------------
U27 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IC DISABLED
- Disconnect: SJB Fuse 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. 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
-------------------------------------------------