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

Communications Network

Pinpoint Test C: The Instrument Panel Cluster (IPC) 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 Panel Cluster (IPC) communicates with the scan tool and other network modules on the High Speed Controller Area Network (HS-CAN) and communicates with other network modules only on the Medium Speed Controller Area Network (MS-CAN).

This pinpoint test is intended to diagnose the following:

- Fuse(s)

- Wiring, terminals or connectors

- IPC (Instrument Panel Cluster)

PINPOINT TEST C : THE IPC (Instrument Panel 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 VDB04 (WH/BU), harness side and the DLC (Data Link Connector) C251-14, circuit 1828 (PK/LG), 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 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) C220-25, 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) C220-26, 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 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 VDB06 (GY/OG), harness side and the DLC (Data Link Connector) C251-11, circuit VDB07 (VT/OG), 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 IPC (Instrument Panel Cluster) AND THE DLC (Data Link Connector) FOR AN OPEN

- Measure the resistance between the IPC (Instrument Panel Cluster) C220-12, circuit VDB06 (GY/OG), harness side and the DLC (Data Link Connector) C251-3, circuit VDB06 (GY/OG), harness side.





- Measure the resistance between the IPC (Instrument Panel Cluster) C220-13, circuit VDB07 (VT/OG), harness side and the DLC (Data Link Connector) C251-11, circuit VDB07 (VT/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.

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

- Measure the resistance between the IPC (Instrument Panel Cluster) C220-5, circuit GD114 (BK/BU) 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 IPC (Instrument Panel Cluster) VOLTAGE SUPPLY CIRCUITS FOR AN OPEN

- Disconnect: IPC (Instrument Panel Cluster) C220.

- Ignition ON.

- Measure the voltage between the IPC (Instrument Panel Cluster) C220-20, circuit CBP29 (WH/VT), harness side and ground; and between the IPC (Instrument Panel Cluster) C220-21, circuit SBP26 (YE/RD), harness side and ground.





Are the voltages greater than 10 volts?

Yes
GO to C7.

No
VERIFY Smart Junction Box (SJB) fuse 26 (10A) or fuse 29 (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. Diagrams By Number

C7 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.