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Pinpoint Test C: The Instrument Cluster (IC) Does Not Respond To The Scan Tool




Communications Network

Pinpoint Tests

Pinpoint Test C: The Instrument Cluster (IC) Does Not Respond To The Scan Tool

Refer to Wiring Diagram Set 14, Module Communications Network for schematic and connector information. Diagrams By Number

Refer to Wiring Diagram Set 60, Instrument Cluster for schematic and connector information. Diagrams By Number

Normal Operation

The Instrument Cluster (IC) communicates with the scan tool through the High Speed Controller Area Network (HS-CAN). Circuits 1827 (WH/LG) (HS-CAN +) and 1828 (PK/LG) (HS-CAN -) provide the HS-CAN connection to the IC and circuits 1847 (WH/OG) (MS-CAN +) and 1848 (PK/OG) (MS-CAN -) provide the MS-CAN connection to the IC. The IC shares the HS-CAN with the PCM, and the ABS module (if equipped). Voltage for the IC is provided by circuits 489 (PK/BK), 1001 (LG/RD) and 1266 (RD/YE). Circuit 1205 (BK) provides ground.

This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- IC


PINPOINT TEST C: THE IC DOES NOT RESPOND TO THE SCAN TOOL

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.

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C1 CHECK THE HS-CAN TERMINATION RESISTANCE


- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Disconnect the scan tool cable from the Data Link Connector (DLC).
- Measure the resistance between the DLC C251-6, circuit 1827 (WH/LG), harness side and the DLC C251-14, circuit 1828 (PK/LG), harness side.




- Is the resistance between 54 and 66 ohms?

Yes
GO to C3.

No
GO to C2.

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C2 CHECK THE HS-CAN CIRCUITS BETWEEN IC AND THE DLC FOR AN OPEN


- Measure the resistance between the IC C220-18, circuit 1827 (WH/LG), harness side and the Data Link Connector (DLC) C251-6, circuit 1827 (WH/LG), harness side.




- Measure the resistance between the IC C220-17, circuit 1828 (PK/LG), harness side and the DLC C251-14, circuit 1828 (PK/LG), harness side.




- Are the resistances less than 5 ohms?

Yes
CONNECT the negative battery cable. GO to C7.

No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.

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C3 CHECK THE MS-CAN TERMINATION RESISTANCE


- Measure the resistance between the DLC C251-3, circuit 1847 (WH/OG), harness side and the DLC C251-11, circuit 1848 (PK/OG), harness side.




- Is the resistance between 54 and 66 ohms?

Yes
GO to C5.

No
GO to C4.

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C4 CHECK THE MS-CAN CIRCUITS BETWEEN THE IC AND THE DLC FOR AN OPEN


- Measure the resistance between the IC C220-15, circuit 1847 (WH/OG), harness side and the DLC C251-3, circuit 1847 (WH/OG), harness side.




- Measure the resistance between the IC C220-14, circuit 1848 (PK/OG), harness side and the DLC C251-11, circuit 1848 (PK/OG), harness side.




- Are the resistances less than 5 ohms?

Yes
CONNECT the negative battery cable. GO to C7.

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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C5 CHECK THE IC GROUND CIRCUIT FOR AN OPEN


- Measure the resistance between the IC C220-2, circuit 1205 (BK) harness side and ground.




- Is the resistance less than 5 ohms?

Yes
CONNECT the negative battery cable. GO to C6.

No
REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.

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C6 CHECK THE IC VOLTAGE SUPPLY CIRCUITS FOR AN OPEN


- Disconnect: IC C220.
- Ignition ON.
- Measure the voltage between the IC, harness side and ground as follows:









- Are the voltages greater than 10 volts?

Yes
GO to C7.

No
VERIFY the SJB fuses 8 (10A), 16 (5A), and 19 (5A) are OK. If OK, REPAIR the circuit in question. If not OK, REFER to the Wiring Diagrams to IDENTIFY the possible causes of the short circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.

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C7 CHECK FOR CORRECT IC OPERATION


- Disconnect the IC connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IC 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 IC. 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.

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