Pinpoint Test A: The Instrument Cluster (IC) Is Inoperative

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test A: The Instrument Cluster (IC) Is Inoperative

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

Normal Operation

The Instrument Cluster (IC) receives the RUN, RUN/START and keep-alive (B+) voltage from the Central Junction Box (CJB). The IC is grounded through hardwired logic and analog or power ground circuits.

This pinpoint test is intended to diagnose the following:

- Fuse(s)
- Wiring, terminals or connectors
- IC



PINPOINT TEST A: THE IC IS INOPERATIVE

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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A1 CHECK THE IC KEEP-ALIVE INPUT CIRCUIT FOR VOLTAGE


- Ignition OFF.
- Disconnect: IC C220.
- Measure the voltage between the IC, C220-1, circuit 1566 (RD/YE), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
GO to A2.

No
VERIFY the CJB fuse 25 (10A) is OK. If OK, REPAIR circuit 1566 (RD/YE) for an open. TEST the system for normal operation. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. Diagrams By Number

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A2 CHECK THE IC RUN AND RUN/START INPUTS FOR VOLTAGE


- Ignition ON.
- Measure the voltage between the IC, C220-17, circuit 1003 (GY/YE), harness side and ground; and between the IC, C220-19, circuit 640 (RD/YE), harness side and ground.




- Are the voltages greater than 10 volts?

Yes
GO to A3.

No
VERIFY the CJB fuses 8 (10A) and 13 (10A) are OK. If OK, REPAIR the circuit in question for an open. TEST the system for normal operation. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. Diagrams By Number

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A3 CHECK THE IC GROUND CIRCUITS FOR AN OPEN


- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the IC, C220-2, circuit 676 (PK/OG), harness side and ground; and between the IC, C220-18, circuit 57 (BK), harness side and ground.




- Are the resistances less than 5 ohms?

Yes
GO to A4.

No
REPAIR the circuit in question for an open. TEST the system for normal operation.

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A4 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. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

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