Pinpoint Test X: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, One Or More Modules Are Not Respond
Communications Network
Pinpoint Tests
Pinpoint Test X: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, One Or More Modules Are Not Responding During Network Test
Normal Operation
The High Speed Controller Area Network (HS-CAN) uses an unshielded twisted pair cable, circuits VDB04 (WH/BU) and VDB05 (WH). In the event that 1 of the 2 network circuits (HS-CAN + or HS-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 HS-CAN:
- 4X4 control module
- ABS module
- Accessory Protocol Interface Module (APIM)
- Trailer Brake Control (TBC) module
- Instrument Cluster (IC)
- Occupant Classification System Module (OCSM)
- PCM
- Restraints Control Module (RCM)
- Transmission Control Module (TCM)
- Telematics module
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
PINPOINT TEST X: INTERMITTENT NO HS-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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X1 CHECK THE DLC PINS FOR DAMAGE
- Ignition OFF.
- Disconnect the scan tool cable from the Data Link Connector (DLC).
- Inspect DLC pins 6 and 14 for damage.
- Are DLC pins 6 and 14 OK?
Yes
GO to X2.
No
REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
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X2 CHECK THE HS-CAN TERMINATION RESISTANCE
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side.
- Is the resistance between 54 and 66 ohms?
Yes
GO to X3.
No
GO to Pinpoint Test W. Pinpoint Test W: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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X3 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND
- Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground.
- Are the resistances greater than 1,000 ohms?
Yes
GO to X4.
No
GO to Pinpoint Test W. Pinpoint Test W: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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X4 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE
- Connect the negative battery cable.
- Ignition ON.
- Measure the voltage between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), 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 X5.
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X5 CHECK FOR RESTORED COMMUNICATION WITH THE PCM AND TCM DISABLED
- Disconnect: Battery Junction Box (BJB) Fuses 26 (10A) and 53 (5A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other HS-CAN modules pass the network test?
Yes
INSTALL the removed fuses.
If the vehicle is equipped with a Transmission Control Module (TCM), GO to X6.
If the vehicle is not equipped with a TCM, GO to Pinpoint Test A. Pinpoint Test A: The PCM Does Not Respond To The Scan Tool
No
INSTALL the removed fuses. GO to X7.
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X6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE TCM DISCONNECTED
- Disconnect: TCM C1575.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other HS-CAN modules pass the network test?
Yes
CONNECT the TCM. GO to Pinpoint Test H. Pinpoint Test H: The Transmission Control Module (TCM) Does Not Respond To The Scan Tool
No
CONNECT the TCM. GO to Pinpoint Test A. Pinpoint Test A: The PCM Does Not Respond To The Scan Tool
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X7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE 4X4 CONTROL MODULE AND ABS MODULE DISABLED
- Disconnect: BJB Fuses 54 (5A) and 68 (20A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other HS-CAN modules pass the network test?
Yes
INSTALL the removed fuses.
If the vehicle is equipped with a 4X4 control module, GO to X8.
If the vehicle is not equipped with a 4X4 control module, GO to Pinpoint Test B. Pinpoint Test B: The ABS Module Does Not Respond To The Scan Tool
No
INSTALL the removed fuses. GO to X9.
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X8 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE 4X4 CONTROL MODULE DISCONNECTED
- Disconnect: 4X4 Control Module C2371a.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other HS-CAN modules pass the network test?
Yes
CONNECT the 4X4 control module. GO to Pinpoint Test F. Pinpoint Test F: The 4X4 Control Module Does Not Respond To The Scan Tool
No
CONNECT the 4X4 control module. GO to Pinpoint Test B. Pinpoint Test B: The ABS Module Does Not Respond To The Scan Tool
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X9 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE RCM DISABLED
- Disconnect: Smart Junction Box (SJB) Fuse 31 (10A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other HS-CAN modules pass the network test?
Yes
INSTALL the removed fuse. GO to Pinpoint Test D. Pinpoint Test D: The Restraints Control Module (RCM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. If the vehicle is equipped with an Accessory Protocol Interface Module (APIM), GO to X10.
If the vehicle is not equipped with an APIM, GO to X11.
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X10 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM DISABLED
- Disconnect: SJB Fuse 13 (5A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other HS-CAN modules pass the network test?
Yes
INSTALL the removed fuse. GO to Pinpoint Test U. Pinpoint Test U: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to X11.
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X11 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE OCSM DISABLED
- Disconnect: SJB Fuse 46 (7.5A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other HS-CAN modules pass the network test?
Yes
INSTALL the removed fuse. GO to Pinpoint Test E. Pinpoint Test E: The Occupant Classification System Module (OCSM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. If the vehicle is equipped with a Trailer Brake Control (TBC) module, GO to X12.
If the vehicle is not equipped with a TBC module, GO to X13.
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X12 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE TBC MODULE DISABLED
- Disconnect: BJB Fuse 17 (30A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other HS-CAN modules pass the network test?
Yes
INSTALL the removed fuse. GO to Pinpoint Test G. Pinpoint Test G: The Trailer Brake Control (TBC) Module Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to X13.
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X13 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 HS-CAN 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.
If the vehicle is equipped with a telematics module, GO to X14.
If the vehicle is not equipped with a telematics module, an intermittent fault is not present. GO to Pinpoint Test W. Pinpoint Test W: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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X14 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE TELEMATICS MODULE DISCONNECTED
- Disconnect: Telematics Module C2409.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other HS-CAN modules pass the network test?
Yes
CONNECT the telematics module. GO to X15.
No
CONNECT the telematics module. An intermittent fault is not present. GO to Pinpoint Test W. Pinpoint Test W: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
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X15 CHECK FOR CORRECT TELEMATICS MODULE OPERATION
- Disconnect the telematics module connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the telematics module connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new telematics module. 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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