Y1-Y20
Communications Network
Pinpoint Tests
Pinpoint Test Y: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding
Refer to Wiring Diagram Set 14, Module Communications Network for schematic and connector information. Diagrams By Number
Normal Operation
The High Speed Controller Area Network (HS-CAN) uses an unshielded twisted pair cable, circuits VDB04 (WH/BU) and VDB05 (WH).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- 4X4 control module
- ABS module
- Accessory Protocol Interface Module (APIM)
- Instrument Cluster (IC)
- Occupant Classification System Module (OCSM)
- PCM
- Restraints Control Module (RCM)
- Transmission Control Module (TCM)
- Trailer Brake Control (TBC) module
- Telematics module
PINPOINT TEST Y: NO HS-CAN 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. Refer to Battery.
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Y1 CHECK THE DLC PINS FOR DAMAGE
- Ignition OFF.
- Disconnect the scan tool cable from the Data Link Connector (DLC).
- Inspect the DLC pins 6 and 14 for damage.
- Are DLC pins 6 and 14 OK?
Yes
GO to Y2.
No
REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
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Y2 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 Y3.
No
GO to Y5.
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Y3 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
CONNECT the negative battery cable.GO to Y4.
No
GO to Y21.
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Y4 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE
- 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.
- Are the voltages greater than 6 volts?
Yes
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
The Controller Area Network (CAN) has tested within specifications. GO to Pinpoint Test X to diagnose an intermittent HS-CAN fault. Pinpoint Test X: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, One Or More Modules Are Not Respond
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Y5 CHECK THE HS-CAN TERMINATION RESISTOR
- 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 108 and 132 ohms?
Yes
GO to Y6.
No
GO to Y9.
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Y6 CHECK THE HS-CAN TERMINATION RESISTOR WITH THE PCM DISCONNECTED
- Disconnect: PCM C175b.
- 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 108 and 132 ohms?
Yes
GO to Y7.
No
GO to Y8.
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Y7 CHECK THE HS-CAN CIRCUITS BETWEEN THE PCM AND THE DLC FOR AN OPEN
- Measure the resistance between the PCM C175b-59, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side.
- Measure the resistance between the PCM C175b-43, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side.
- Are the resistances less than 5 ohms?
Yes
CONNECT the negative battery cable. GO to Y31.
No
REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
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Y8 CHECK THE HS-CAN CIRCUITS BETWEEN THE DLC AND THE IC FOR AN OPEN
- Measure the resistance between the IC C220-15, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side.
- Measure the resistance between the IC C220-14, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side.
- Are the resistances less than 5 ohms?
Yes
CONNECT the negative battery cable. GO to Y39.
No
REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
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Y9 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER
- 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 less than 5 ohms?
Yes
GO to Y11.
No
GO to Y10.
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Y10 CHECK THE HS-CAN CIRCUITS BETWEEN THE PCM AND THE DLC FOR AN OPEN
- Measure the resistance between the PCM C175b-59, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side.
- Measure the resistance between the PCM C175b-43, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side.
- Are the resistances less than 5 ohms?
Yes
REPAIR the DLC or REPAIR the circuit in question. CONNECT all modules. 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.
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Y11 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE PCM DISCONNECTED
- Disconnect: PCM C175b.
- 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 less than 5 ohms?
Yes
If the vehicle is equipped with a Transmission Control Module (TCM), GO to Y12.
If the vehicle is not equipped with a TCM, GO to Y13.
No
CONNECT the negative battery cable. GO to Y31.
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Y12 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE TCM DISCONNECTED
- Disconnect: TCM C1575.
- 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 less than 5 ohms?
Yes
GO to Y13.
No
CONNECT the negative battery cable. GO to Y32.
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Y13 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE ABS MODULE DISCONNECTED
- Disconnect: ABS Module C135.
- 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 less than 5 ohms?
Yes
If the vehicle is equipped with a 4X4 control module, GO to Y14.
If the vehicle is not equipped with a 4X4 control module, GO to Y15.
No
CONNECT the negative battery cable. GO to Y33.
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Y14 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE 4X4 CONTROL MODULE DISCONNECTED
- Disconnect: 4X4 Control Module C2371a.
- 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 less than 5 ohms?
Yes
GO to Y15.
No
CONNECT the negative battery cable. GO to Y34.
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Y15 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE RCM DISCONNECTED
- Disconnect: RCM C310b.
- 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 less than 5 ohms?
Yes
If the vehicle is equipped with a Trailer Brake Control (TBC) module, GO to Y16.
If the vehicle is not equipped with a TBC module, GO to Y17.
No
CONNECT the negative battery cable. GO to Y35.
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Y16 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE TBC MODULE DISCONNECTED
- Disconnect: TBC Module C2142.
- 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 less than 5 ohms?
Yes
GO to Y17.
No
CONNECT the negative battery cable. GO to Y36.
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Y17 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE OCSM DISCONNECTED
- Disconnect: Occupant Classification System Module (OCSM) C3159.
- 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 less than 5 ohms?
Yes
If the vehicle is equipped with an Accessory Protocol Interface Module (APIM), GO to Y18.
If the vehicle is not equipped with an APIM, GO to Y19.
No
CONNECT the negative battery cable. GO to Y37.
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Y18 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE APIM DISCONNECTED
- Disconnect: APIM C2283.
- 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 less than 5 ohms?
Yes
GO to Y19.
No
CONNECT the negative battery cable. GO to Y38.
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Y19 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE IC DISCONNECTED
- Disconnect: IC C220.
- 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 less than 5 ohms?
Yes
If the vehicle is equipped with a telematics module, GO to Y20.
If the vehicle is not equipped with a telematics module, REPAIR the circuits. CONNECT all modules. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
CONNECT the negative battery cable. GO to Y39.
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Y20 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE TELEMATICS MODULE DISCONNECTED
- Disconnect: Telematics Module C2409.
- 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 less than 5 ohms?
Yes
REPAIR the circuits. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
CONNECT the negative battery cable. GO to Y40.
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