Pinpoint Test M: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication
Communications Network
Pinpoint Test M: 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.
In the event that either the MS-CAN (Medium Speed Controller Area Network) (+) or MS-CAN (Medium Speed Controller Area Network) (-) circuit 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
- Data Link Connector (DLC)
PINPOINT TEST M : INTERMITTENT NO MS-CAN (Medium Speed Controller Area Network) 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.
M1 CHECK THE DLC (Data Link Connector) PINS FOR DAMAGE
- Ignition OFF.
- Disconnect the scan tool cable from the DLC (Data Link Connector).
- Inspect DLC (Data Link Connector) pins 3 and 11 for damage.
Are DLC (Data Link Connector) pins 3 and 11 OK?
Yes
GO to M2.
No
REPAIR the DLC (Data Link Connector) as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
M2 CHECK THE MS-CAN (Medium Speed Controller Area Network) TERMINATION RESISTANCE
- Disconnect: Negative Battery Cable.
- Measure the resistance between the DLC (Data Link Connector) C251-3, circuit 4-EC1 (GY/RD)/4-EC13 (GY/VT)/4-EC14 (GY/OG), harness side and the DLC (Data Link Connector) C251-11, circuit 5-EC1 (BU/RD)/5-EC13 (BU/WH)/5-EC14 (BU/BK), harness side.
Is the resistance between 36 and 44 ohms?
Yes
GO to M3.
No
CONNECT the negative battery cable. GO to Pinpoint Test L. Pinpoint Test L: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
M3 CHECK THE MS-CAN (Medium Speed Controller Area Network) (+) AND MS-CAN (Medium Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TO GROUND
- Measure the resistance between the DLC (Data Link Connector) C251-3, circuit 4-EC1 (GY/RD)/4-EC13 (GY/VT)/4-EC14 (GY/OG), harness side and ground; and between the DLC (Data Link Connector) C251-11, circuit 5-EC1 (BU/RD)/5-EC13 (BU/WH)/5-EC14 (BU/BK), harness side and ground.
Are the resistances greater than 1,000 ohms?
Yes
CONNECT the negative battery cable. GO to M4.
No
CONNECT the negative battery cable. GO to Pinpoint Test L. Pinpoint Test L: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
M4 CHECK THE MS-CAN (Medium Speed Controller Area Network) (+) AND MS-CAN (Medium Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure the voltage between the DLC (Data Link Connector) C251-3, circuit 4-EC1 (GY/RD)/4-EC13 (GY/VT)/4-EC14 (GY/OG), harness side and ground; and between the DLC (Data Link Connector) C251-11, circuit 5-EC1 (BU/RD)/5-EC13 (BU/WH)/5-EC14 (BU/BK), 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 M5.
M5 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ACM (Audio Control Module) AND SRM (Speech Recognition 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: Central Junction Box (CJB) Fuse 151 (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.
If the vehicle is equipped with a Speech Recognition Module (SRM), GO to M6.
If the vehicle is not equipped with a SRM (Speech Recognition Module), GO to Pinpoint Test E. Pinpoint Test E: The Audio Control Module (ACM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to M7.
M6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ACM (Audio Control Module) 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: ACM (Audio Control Module) C240B.
- 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 (Audio Control Module). GO to Pinpoint Test E. Pinpoint Test E: The Audio Control Module (ACM) Does Not Respond To The Scan Tool
No
CONNECT the ACM (Audio Control Module). GO to Pinpoint Test F. Pinpoint Test F: The Speech Recognition Module (SRM) Does Not Respond To The Scan Tool
M7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE OCSM (Occupant Classification System Module) AND RCM (Restraints Control 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: Central Junction Box (CJB) Fuse 162 (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 M8.
No
INSTALL the removed fuse. GO to M9.
M8 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE OCSM (Occupant Classification System Module) 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: OCSM (Occupant Classification System Module) C3159.
- 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 OCSM (Occupant Classification System Module). GO to Pinpoint Test H. Pinpoint Test H: The Occupant Classification System Module (OCSM) Does Not Respond To The Scan Tool
No
CONNECT the OCSM (Occupant Classification System Module). GO to Pinpoint Test I. Pinpoint Test I: The Restraints Control Module (RCM) Does Not Respond To The Scan Tool
M9 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IC (Instrument Cluster), GEM (Generic Electronic Module) AND TPMS (Tire Pressure Monitoring System) 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: CJB (Central Junction Box) Fuses 148 (7.5A) and 179 (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 M10.
No
INSTALL the removed fuses. An intermittent fault is not present. GO to Pinpoint Test L. Pinpoint Test L: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
M10 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IC (Instrument Cluster) 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: IC (Instrument Cluster) C220B.
- 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 (Instrument Cluster). GO to Pinpoint Test C. Pinpoint Test C: The Instrument Cluster (IC) Does Not Respond To The Scan Tool
No
CONNECT the IC (Instrument Cluster). GO to M11.
M11 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE GEM (Generic Electronic Module) 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: GEM (Generic Electronic Module) C201B.
- 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 GEM (Generic Electronic Module). GO to Pinpoint Test K. Pinpoint Test K: The Generic Electronic Module (GEM) Does Not Respond To The Scan Tool
No
CONNECT the GEM (Generic Electronic Module). GO to Pinpoint Test J. Pinpoint Test J: The Tire Pressure Monitoring System (TPMS) Module Does Not Respond To The Scan Tool