Pinpoint Test N: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding
Communications Network
Pinpoint Test N: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding
Normal Operation
The High Speed Controller Area Network (HS-CAN) uses an unshielded twisted pair cable.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- ABS module
- Accessory Protocol Interface Module (APIM)
- Instrument Panel Cluster (IPC)
- PCM
- Restraints Control Module (RCM)
- Trailer Brake Control (TBC) module
- Telematics Module
PINPOINT TEST N : NO HS-CAN (High Speed Controller Area Network) COMMUNICATION, ALL MODULES ARE NOT RESPONDING
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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: Failure to disconnect the battery when instructed will result in false resistance readings.
N1 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 N2.
No
REPAIR the DLC (Data Link Connector) as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
N2 CHECK THE HS-CAN (High Speed Controller Area Network) TERMINATION RESISTANCE
- 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 N3.
No
GO to N5.
N3 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 1,000 ohms?
Yes
GO to N4.
No
GO to N19.
N4 CHECK THE HS-CAN (High Speed Controller Area Network) (+) AND HS-CAN (High Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TO VOLTAGE
- Connect the negative battery cable.
- 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.
Is the voltage greater than 6 volts?
Yes
REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
The CAN (Controller Area Network) has tested within specifications. GO to Pinpoint Test O to test for an intermittent network fault condition. Pinpoint Test O: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, Communication Can Be Intermittently
N5 CHECK THE HS-CAN (High Speed Controller Area Network) TERMINATION RESISTOR
- 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 108 and 132 ohms?
Yes
GO to N6.
No
GO to N9.
N6 CHECK THE HS-CAN (High Speed Controller Area Network) TERMINATION RESISTOR WITH THE PCM DISCONNECTED
- Disconnect: PCM C175B.
- 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 108 and 132 ohms?
Yes
GO to N7.
No
GO to N8.
N7 CHECK THE HS-CAN (High Speed Controller Area Network) CIRCUITS BETWEEN THE PCM AND THE DLC (Data Link Connector) FOR AN OPEN
- Disconnect: PCM C175B or C1381B.
- Measure the resistance between the PCM, harness side, and the DLC (Data Link Connector), harness side, as follows:
Engine PCM Connector-Pin DLC (Data Link Connector) Connector-Pin Circuit 4.6L and 5.4L C175B-59 C251-6 VDB04 (WH/BU) 6.8L C1551B-11 C251-6 VDB04 (WH/BU) 4.6L and 5.4L C175B-43 C251-14 VDB05 (WH) 6.8L C1551B-23 C251-14 VDB05 (WH)
Are the resistances less than 5 ohms?
Yes
CONNECT the negative battery cable. GO to N27.
No
REPAIR the circuit in question. CONNECT the negative battery cable. CONNECT the PCM. CLEAR the DTCs. REPEAT the network test with the scan tool.
N8 CHECK THE HS-CAN (High Speed Controller Area Network) CIRCUITS BETWEEN THE IPC (Instrument Panel Cluster) AND THE DLC (Data Link Connector) FOR AN OPEN
- Disconnect: IPC (Instrument Panel Cluster) C220.
- Measure the resistance between the IPC (Instrument Panel Cluster) C220-7, circuit VDB04 (WH/BU), harness side and the DLC (Data Link Connector) C251-6, circuit VDB04 (WH/BU), harness side.
- Measure the resistance between the IPC (Instrument Panel Cluster) C220-6, circuit VDB05 (WH), harness side and the DLC (Data Link Connector) C251-14, circuit VDB05 (WH), harness side.
Are the resistances less than 5 ohms?
Yes
CONNECT all modules. CONNECT the negative battery cable. GO to N32.
No
REPAIR the circuit in question. CONNECT all modules. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
N9 CHECK THE HS-CAN (High Speed Controller Area Network) (+) AND HS-CAN (High Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TOGETHER
- 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 less than 5 ohms?
Yes
GO to N11.
No
GO to N10.
N10 CHECK THE HS-CAN (High Speed Controller Area Network) CIRCUITS FOR AN OPEN AT THE DLC (Data Link Connector)
- 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 greater than 10,000 ohms?
Yes
REPAIR the DLC (Data Link Connector) or REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
A capacitor internal to a module may still be draining causing irregular resistance readings. WAIT 5 minutes. REPEAT the pinpoint test.
N11 CHECK THE HS-CAN (High Speed Controller Area Network) (+) AND HS-CAN (High Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TOGETHER WITH THE PCM DISCONNECTED
- Disconnect: PCM C175B or C1381B.
- 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 less than 5 ohms?
Yes
If the vehicle is equipped with a telematics module, GO to N12. If the vehicle is not equipped with a telematics module, GO to N13.
No
CONNECT the negative battery cable. GO to N27.
N12 CHECK THE HS-CAN (High Speed Controller Area Network) (+) AND HS-CAN (High Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TOGETHER WITH THE TELEMATICS MODULE DISCONNECTED
- Disconnect: Telematics Module C2409.
- 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 less than 5 ohms?
Yes
GO to N13.
No
CONNECT the negative battery cable. GO to N33.
N13 CHECK THE HS-CAN (High Speed Controller Area Network) (+) AND HS-CAN (High Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TOGETHER WITH THE ABS MODULE DISCONNECTED
- Disconnect: ABS Module C135 or C155.
- 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 less than 5 ohms?
Yes
For stripped chassis, GO to N16.
Otherwise, GO to N14.
No
CONNECT all modules. CONNECT the negative battery cable. GO to N28.
N14 CHECK THE HS-CAN (High Speed Controller Area Network) (+) AND HS-CAN (High Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TOGETHER WITH THE RCM (Restraints Control Module) DISCONNECTED
- Disconnect: Restraints Control Module (RCM) C310B.
- 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 less than 5 ohms?
Yes
If the vehicle is equipped with a Trailer Brake Control (TBC) module, GO to N15.
If the vehicle is not equipped with a TBC (Trailer Brake Control) module, GO to N16.
No
CONNECT all modules. CONNECT the negative battery cable. GO to N29.
N15 CHECK THE HS-CAN (High Speed Controller Area Network) (+) AND HS-CAN (High Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TOGETHER WITH THE TBC (Trailer Brake Control) MODULE DISCONNECTED
- Disconnect: TBC (Trailer Brake Control) Module C2142.
- 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 less than 5 ohms?
Yes
GO to N16.
No
CONNECT all modules. CONNECT the negative battery cable. GO to N30.
N16 VERIFY VEHICLE EQUIPMENT - APIM (Accessory Protocol Interface Module)
- Inspect the vehicle for a APIM (Accessory Protocol Interface Module).
Is the vehicle equipped with a APIM (Accessory Protocol Interface Module)?
Yes
GO to N17.
No
GO to N18.
N17 CHECK THE HS-CAN (High Speed Controller Area Network) (+) AND HS-CAN (High Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TOGETHER WITH THE APIM (Accessory Protocol Interface Module) DISCONNECTED
- Disconnect: APIM (Accessory Protocol Interface Module) C2383.
- 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 less than 5 ohms?
Yes
GO to N18.
No
CONNECT all modules. CONNECT the negative battery cable. GO to N31.
N18 CHECK THE HS-CAN (High Speed Controller Area Network) (+) AND HS-CAN (High Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TOGETHER WITH THE IPC (Instrument Panel Cluster) DISCONNECTED
- Disconnect: IPC (Instrument Panel Cluster) C220.
- 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 less than 5 ohms?
Yes
REPAIR the circuit. CONNECT all modules. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
CONNECT all modules. CONNECT the negative battery cable. GO to N32.
N19 CHECK THE HS-CAN (High Speed Controller Area Network) (+) AND HS-CAN (High Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TO GROUND WITH THE PCM DISCONNECTED
- Disconnect: PCM C175B or C1381B.
- 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 1,000 ohms?
Yes
CONNECT the negative battery cable. GO to N27.
No
If the vehicle is equipped with a telematics module, GO to N20. If the vehicle is not equipped with a telematics module, GO to N21.
N20 CHECK THE HS-CAN (High Speed Controller Area Network) (+) AND HS-CAN (High Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TO GROUND WITH THE TELEMATICS MODULE DISCONNECTED
- Disconnect: Telematics Module C2409.
- 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.
Is the resistance less than 5 ohms?
Yes
CONNECT the negative battery cable. GO to N33.
No
GO to N21.
N21 CHECK THE HS-CAN (High Speed Controller Area Network) (+) AND HS-CAN (High Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TO GROUND WITH THE ABS MODULE DISCONNECTED
- Disconnect: ABS Module C135 or C155.
- 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 1,000 ohms?
Yes
CONNECT all modules. CONNECT the negative battery cable. GO to N28.
No
For stripped chassis, GO to N26.
Otherwise, GO to N22.
N22 CHECK THE HS-CAN (High Speed Controller Area Network) (+) AND HS-CAN (High Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TO GROUND WITH THE RCM (Restraints Control Module) DISCONNECTED
- Disconnect: RCM (Restraints Control Module) C310B.
- 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 1,000 ohms?
Yes
CONNECT all modules. CONNECT the negative battery cable. GO to N29.
No
If the vehicle is equipped with a Trailer Brake Control (TBC) module, GO to N23.
If the vehicle is not equipped with a TBC (Trailer Brake Control) module, GO to N24.
N23 CHECK THE HS-CAN (High Speed Controller Area Network) (+) AND HS-CAN (High Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TO GROUND WITH THE TBC (Trailer Brake Control) MODULE DISCONNECTED
- Disconnect: TBC (Trailer Brake Control) Module C2142.
- 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 1,000 ohms?
Yes
CONNECT all modules. CONNECT the negative battery cable. GO to N30.
No
GO to N24.
N24 VERIFY VEHICLE EQUIPMENT - APIM (Accessory Protocol Interface Module)
- Inspect the vehicle for a APIM (Accessory Protocol Interface Module).
Is the vehicle equipped with a APIM (Accessory Protocol Interface Module)?
Yes
GO to N25.
No
GO to N26.
N25 CHECK THE HS-CAN (High Speed Controller Area Network) (+) AND HS-CAN (High Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TO GROUND WITH THE APIM (Accessory Protocol Interface Module) DISCONNECTED
- Disconnect: APIM (Accessory Protocol Interface Module) C2383.
- 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 1,000 ohms?
Yes
CONNECT all modules. CONNECT the negative battery cable. GO to N31.
No
GO to N26.
N26 CHECK THE HS-CAN (High Speed Controller Area Network) (+) AND HS-CAN (High Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TO GROUND WITH THE IPC (Instrument Panel Cluster) DISCONNECTED
- Disconnect: IPC (Instrument Panel Cluster) C220.
- 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 1,000 ohms?
Yes
CONNECT all modules. CONNECT the negative battery cable. GO to N32.
No
REPAIR the circuit. CONNECT all modules. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
N27 CHECK FOR CORRECT PCM OPERATION
- Disconnect all the PCM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the PCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new PCM. 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. CLEAR the DTCs. REPEAT the network test with the scan tool.
N28 CHECK FOR CORRECT ABS MODULE OPERATION
- Disconnect the ABS module connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the ABS 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 ABS module. 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. CLEAR the DTCs. REPEAT the network test with the scan tool.
N29 CHECK FOR CORRECT RCM (Restraints Control Module) OPERATION
- Disconnect all of the RCM (Restraints Control Module) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all of the RCM (Restraints 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
INSTALL a new RCM (Restraints Control Module). 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. CLEAR the DTCs. REPEAT the network test with the scan tool.
N30 CHECK FOR CORRECT TBC (Trailer Brake Control) MODULE OPERATION
- Disconnect the TBC (Trailer Brake Control) module connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the TBC (Trailer Brake Control) 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 TBC (Trailer Brake Control) module. 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. CLEAR the DTCs. REPEAT the network test with the scan tool.
N31 CHECK FOR CORRECT APIM (Accessory Protocol Interface Module) OPERATION
- Disconnect the APIM (Accessory Protocol Interface Module) connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the APIM (Accessory Protocol Interface 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 APIM (Accessory Protocol Interface Module). 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. CLEAR the DTCs. REPEAT the network test with the scan tool.
N32 CHECK FOR CORRECT IPC (Instrument Panel Cluster) OPERATION
- Disconnect the IPC (Instrument Panel Cluster) connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IPC (Instrument Panel Cluster) 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 IPC (Instrument Panel Cluster). 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. CLEAR the DTCs. REPEAT the network test with the scan tool.
N33 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. 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. CLEAR the DTCs. REPEAT the network test with the scan tool.