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

Communications Network

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

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

Refer to Wiring Diagrams Set 60, Instrument Cluster for schematic and connector information. Electrical Diagrams

Normal Operation

The Instrument Cluster (IC) communicates with the scan tool and other network modules on the High Speed Controller Area Network (HS-CAN). The IC (Instrument Cluster) communicates with other network modules on the Medium Speed Controller Area Network (MS-CAN).

This pinpoint test is intended to diagnose the following:

- Fuse(s)

- Wiring, terminals or connectors

- IC (Instrument Cluster)

PINPOINT TEST C : THE IC (Instrument Cluster) 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.

C1 CHECK THE HS-CAN (High Speed Controller Area Network) 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 (Data Link Connector) C251-6, circuit 4-EC7 (GY/RD)/4-EC8 (GY/VT), harness side and the DLC (Data Link Connector) C251-14, circuit 5-EC7 (BU/RD)/5-EC8 (BU/WH), harness side.





Is the resistance between 54 and 66 ohms?

Yes
GO to C3.

No
GO to C2.

C2 CHECK THE HS-CAN (High Speed Controller Area Network) CIRCUITS BETWEEN THE DLC (Data Link Connector) AND THE IC (Instrument Cluster) FOR AN OPEN

- Disconnect: IC (Instrument Cluster) C220B.

- Measure the resistance between the DLC (Data Link Connector) C251-6, circuit 4-EC7 (GY/RD)/4-EC8 (GY/VT), harness side and the IC (Instrument Cluster) C220B-23, circuit 4-EC8 (GY/VT), harness side.





- Measure the resistance between the DLC (Data Link Connector) C251-14, circuit 5-EC7 (BU/RD)/5-EC8 (BU/WH), harness side and the IC (Instrument Cluster) C220B-24, circuit 5-EC8 (BU/WH), 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.

C3 CHECK THE MS-CAN (Medium Speed Controller Area Network) TERMINATION RESISTANCE

- Measure the resistance between the DLC (Data Link Connector) C251-3, circuit 4-EC1 (GY/RD)/4-EC13 (GY/VT)/4-EC14 (GY/OG), harness side and the DLC (Data Link Connector) C251-11, circuit 5-EC1 (BU/RD)/5-EC13 (BU/WH)/5-EC14 (BU/BK), harness side.





Is the resistance between 54 and 66 ohms?

Yes
GO to C5.

No
GO to C4.

C4 CHECK THE MS-CAN (Medium Speed Controller Area Network) CIRCUITS BETWEEN THE DLC (Data Link Connector) AND THE IC (Instrument Cluster) FOR AN OPEN

- Measure the resistance between the DLC (Data Link Connector) C251-3, circuit 4-EC1 (GY/RD)/4-EC13 (GY/VT)/4-EC14 (GY/OG), harness side and the IC (Instrument Cluster) C220B-21, circuit 4-EC13 (GY/VT), harness side.





- Measure the resistance between the DLC (Data Link Connector) C251-11, circuit 5-EC1 (BU/RD)/5-EC13 (BU/WH)/5-EC14 (BU/BK), harness side and the IC (Instrument Cluster) C220B-22, circuit 5-EC13 (BU/WH), 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.

C5 CHECK THE IC (Instrument Cluster) GROUND CIRCUIT FOR AN OPEN

- Measure the resistance between the IC (Instrument Cluster) C220B-2, circuit 91-GC14 (BK/OG) 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.

C6 CHECK THE IC (Instrument Cluster) VOLTAGE SUPPLY CIRCUITS FOR AN OPEN

- Ignition ON.

- Measure the voltage between the IC (Instrument Cluster) C220B-1, circuit 29-GG14 (OG), harness side and ground; and between the IC (Instrument Cluster) C220B-6, circuit 15-GG14 (GN/RD), harness side and ground.





Are the voltages greater than 10 volts?

Yes
GO to C7.

No
VERIFY Central Junction Box (CJB) fuse 148 (7.5A) or fuse 179 (7.5A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool. Electrical Diagrams

C7 CHECK FOR CORRECT IC (Instrument Cluster) OPERATION

- Disconnect the IC (Instrument Cluster) connector.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect the IC (Instrument 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 IC (Instrument 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.