Pinpoint Test U: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, Communication Can Be Intermittently
Communications Network
Pinpoint Tests
Pinpoint Test U: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, Communication Can Be Intermittently Established
Normal Operation
The High Speed Controller Area Network (HS-CAN) uses an unshielded twisted pair cable. 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 can result.
The following modules communicate with the scan tool using the HS-CAN:
- 4X4 control module
- ABS module
- Accessory Protocol Interface Module (APIM)
- Instrument Cluster (IC)
- Occupant Classification System Module (OCSM)
- Parking Aid Module (PAM)
- PCM
- Power Steering Control Module (PSCM)
- Restraints Control Module (RCM)
- Steering Angle Sensor Module (SASM)
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
PINPOINT TEST U: INTERMITTENT NO HS-CAN COMMUNICATION, COMMUNICATION CAN BE INTERMITTENTLY ESTABLISHED
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.
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U1 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 U2.
No
REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
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U2 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 U3.
No
GO to Pinpoint Test V. Pinpoint Test V: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding
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U3 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 U4.
No
GO to Pinpoint Test V. Pinpoint Test V: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding
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U4 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE
- Connect: 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 U5.
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U5 CHECK FOR RESTORED COMMUNICATION WITH THE PCM DISABLED
- Disconnect: Battery Junction Box (BJB) Fuses 23 (7.5A) and 47 (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. 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.
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U6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ABS MODULE AND PSCM DISABLED
- Disconnect: SJB Fuse 34 (5A).
- Disconnect: BJB Fuse 12 (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 fuse.
If the vehicle is equipped with a Power Steering Control Module (PSCM), GO to U7.
If the vehicle is not equipped with a PSCM, GO to Pinpoint Test B. Pinpoint Test B: The ABS Module Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to U8.
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U7 CHECK FOR RESTORED COMMUNICATION WITH THE ABS MODULE DISCONNECTED
- Disconnect: ABS Module C135.
- 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 ABS module. GO to Pinpoint Test B. Pinpoint Test B: The ABS Module Does Not Respond To The Scan Tool
No
CONNECT the ABS module. GO to Pinpoint Test G. Pinpoint Test G: The Power Steering Control Module (PSCM) Does Not Respond To The Scan Tool
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U8 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE RCM DISABLED
- Disconnect: SJB Fuse 32 (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. GO to U9.
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U9 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 an APIM, GO to U10.
If the vehicle is not equipped with an APIM, GO to U11.
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U10 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM DISABLED
- Disconnect: SJB Fuse 14 (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 T. Pinpoint Test T: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to U11.
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U11 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE 4X4 CONTROL MODULE, PAM AND SASM DISABLED
- Disconnect: SJB Fuses 11 (10A) and 35 (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 fuses. GO to U12.
No
INSTALL the removed fuses. GO to U13.
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U12 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE 4X4 CONTROL MODULE, PAM AND SASM DISCONNECTED
- Disconnect: 4X4 Control Module C281 (If Equipped).
- Repeat the network test. If all other HS-CAN modules pass the network test, skip to end of test step. Otherwise, continue.
- Disconnect: Parking Aid Module (PAM) C3267 (If Equipped).
- Repeat the network test. If all other HS-CAN modules pass the network test, skip to end of test step. Otherwise, continue.
- Disconnect: Steering Angle Sensor Module (SASM) C2412 (If Equipped).
- 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 all modules.
For 4X4 control module, GO to Pinpoint Test F. Pinpoint Test F: The 4X4 Control Module Does Not Respond To The Scan Tool
For PAM, GO to Pinpoint Test I. Pinpoint Test I: The Parking Aid Module (PAM) Does Not Respond To The Scan Tool
For SASM, GO to Pinpoint Test H. Pinpoint Test H: The Steering Angle Sensor Module (SASM) Does Not Respond To The Scan Tool
No
An intermittent fault is not present. GO to Pinpoint Test V. Pinpoint Test V: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding
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U13 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 fuse. GO to Pinpoint Test V. Pinpoint Test V: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding
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