Pinpoint Test U: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, One Or More Modules Are Not Respond
Communications Network
Pinpoint Test U: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, One Or More Modules Are Not Responding During Network Test
Normal Operation
In the event that either High Speed Controller Area Network (HS-CAN) circuit becomes open to any module on the network, unreliable network communication to all modules on the network may result.
This pinpoint test is intended to diagnose the following:
- ABS module
- Accessory Protocol Interface Module (APIM) (if equipped)
- Trailer Brake Control (TBC) module (if equipped)
- PCM
- Restraints Control Module (RCM)
- Auxiliary Heater Control Module (AHCM) (diesel engine only, if equipped)
- Transmission Control Module (TCM) (diesel engine only, if equipped)
- Instrument Panel Cluster (IPC)
- Parking Aid Module (PAM) (if equipped)
- Transfer Case Control Module (TCCM) (if equipped)
- Body Control Module (BCM)
PINPOINT TEST U : INTERMITTENT NO HS-CAN (High 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.
U1 CHECK THE DLC (Data Link Connector) PINS FOR DAMAGE
- Ignition OFF.
- Disconnect the scan tool cable from the Data Link Connector (DLC).
- Inspect DLC (Data Link Connector) pins 6 and 14 for damage.
Are DLC (Data Link Connector) pins 6 and 14 OK?
Yes
GO to U2.
No
REPAIR the DLC (Data Link Connector) as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
U2 CHECK THE HS-CAN (High Speed Controller Area Network) TERMINATION RESISTANCE
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the DLC (Data Link Connector) C251-6, circuit VDB04 (WH/BU), harness side and the DLC (Data Link Connector) C251-14, circuit VDB05 (WH), harness side.
Is the resistance between 54 and 66 ohms?
Yes
GO to U3.
No
GO to Pinpoint Test V. Pinpoint Test V: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding
U3 CHECK THE HS-CAN (High Speed Controller Area Network) (+) AND HS-CAN (High Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TO GROUND
- Measure the resistance between the DLC (Data Link Connector) C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC (Data Link Connector) C251-14, circuit VDB05 (WH), 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 V. Pinpoint Test V: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding
U4 CHECK THE HS-CAN (High Speed Controller Area Network) (+) AND HS-CAN (High Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure the voltage between the DLC (Data Link Connector) C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC (Data Link Connector) C251-14, circuit VDB05 (WH), harness side and ground.
Are the voltages greater than 6 volts?
Yes
REPAIR the short to voltage for the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
GO to U5.
U5 CHECK FOR RESTORED COMMUNICATION WITH THE PCM DISABLED
NOTE: An Integrated Diagnostic System (IDS) session must be established prior to disabling the PCM in this test step. If the PCM has failed communication during multiple attempts to identify the vehicle, first identify the vehicle manually by entering a PCM part number, calibration number or tear tag when prompted by IDS (Integrated Diagnostic System).
NOTE: When a vehicle is manually identified by a PCM part number, calibration number or tear tag, the IDS (Integrated Diagnostic System) will not automatically run a network test. The network test must be manually selected and run.
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: Battery Junction Box (BJB) Fuses 33 (15A), 52 (10A) and 72 (10A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
Do all other HS-CAN (High Speed Controller Area Network) modules pass the network test?
Yes
INSTALL the removed fuses. GO to Pinpoint Test A. Pinpoint Test A: The PCM Does Not Respond To The Scan Tool
No
INSTALL the removed fuses. GO to U6.
U6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ABS 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: BJB (Battery Junction Box) Fuses 86 (25A) and 54 (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 B. Pinpoint Test B: The ABS Module Does Not Respond To The Scan Tool
No
If the vehicle is equipped with a TBC (Trailer Brake Control) module, INSTALL the removed fuses. GO to U7.
If the vehicle is not equipped with a TBC (Trailer Brake Control) module, INSTALL the removed fuses. GO to U8.
U7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE TBC (Trailer Brake Control) MODULE 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: TBC (Trailer Brake Control) Module.
- 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 TBC (Trailer Brake Control) module. GO to Pinpoint Test D. Pinpoint Test D: The Trailer Brake Control (TBC) Module Does Not Respond To The Scan Tool
No
CONNECT the TBC (Trailer Brake Control) module. GO to U8.
U8 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE RCM (Restraints Control 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: BCM (Body Control Module) Fuse 33 (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 E. Pinpoint Test E: The Restraints Control Module (RCM) Does Not Respond To The Scan Tool
No
If the vehicle is equipped with an APIM (Accessory Protocol Interface Module), INSTALL the removed fuse. GO to U9.
If the vehicle is not equipped with an APIM (Accessory Protocol Interface Module), INSTALL the removed fuse. GO to U10.
U9 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM (Accessory Protocol Interface 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: BCM (Body Control Module) Fuse 29 (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 R. Pinpoint Test R: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to U10.
U10 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IPC (Instrument Panel Cluster) 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: BCM (Body Control Module) Fuse 11 (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 C. Pinpoint Test C: The IPC (Instrument Panel Cluster) Does Not Respond To The Scan Tool
No
If the vehicle is equipped with a diesel engine, INSTALL the removed fuses. GO to U11.
If the vehicle is not equipped with a diesel engine, INSTALL the removed fuses. GO to U14.
U11 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE TCM (Transmission Control 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: BJB (Battery Junction Box) Fuses 46 (10A) and 52 (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 Transmission Control Module (TCM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuses. GO to U12.
U12 VERIFY VEHICLE EQUIPMENT - AHCM (Auxiliary Heater Control Module)
- Inspect the vehicle for an AHCM (Auxiliary Heater Control Module). This module is present on some diesel engine equipped vehicles.
Is the vehicle equipped with an AHCM (Auxiliary Heater Control Module) ?
Yes
GO to U13.
No
GO to U14.
U13 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE AHCM (Auxiliary Heater Control 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: BCM (Body Control Module) Fuse 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 fuse. GO to Pinpoint Test F. Pinpoint Test F: The Auxiliary Heater Control Module (AHCM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to U14.
U14 VERIFY VEHICLE EQUIPMENT - PAM (Parking Aid Module)
- Inspect the vehicle for a PAM (Parking Aid Module). This module is present on some diesel engine equipped vehicles.
Is the vehicle equipped with a PAM (Parking Aid Module) ?
Yes
GO to U15.
No
GO to U16
U15 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE PAM (Parking Aid Module) 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: BCM (Body Control Module) Fuse 35 (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 O. Pinpoint Test O: The Parking Aid Module (PAM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to U16.
U16 VERIFY VEHICLE EQUIPMENT - TCCM (Transfer Case Control Module)
- Inspect the vehicle for a TCCM (Transfer Case Control Module).
Is the vehicle equipped with a TCCM (Transfer Case Control Module) ?
Yes
GO to U17.
No
GO to U18.
U17 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE TCCM (Transfer Case Control Module) 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: BJB (Battery Junction Box) Fuses 40 (15A), 53 (20A) and 84 (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 fuses. GO to Pinpoint Test Q. Pinpoint Test Q: The Transfer Case Control Module (TCCM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuses. GO to U18.
U18 CHECK FOR CORRECT BCM (Body Control Module) OPERATION
- Disconnect all the BCM (Body Control Module) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the BCM (Body Control Module) connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
GO to Pinpoint Test H. Pinpoint Test H: The Body Control Module (BCM) Does Not Respond To The Scan Tool
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.