Schematic Reference: Body Control System Schematics , Instrument Cluster Schematics , Engine Controls Schematics for the 2.8L (LP1) engine, Engine Controls Schematics for the 3.6L (LY7) engine, or Engine Controls Schematics for the 6.0L engine

Connector End View Reference: Computer/Integrating Systems Connector End Views , Engine Control Module Connector End Views for the 2.8L (LP1) engine, Engine Control Module Connector End Views for the 3.6L (LY7) engine, or Engine Control Module Connector End Views for the 6.0L engine

1

Did you perform the Diagnostic System Check - Vehicle?

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Go to Step 2

Go to Diagnostic System Check - Vehicle

1. Install a scan tool.
2. Start the engine.
3. Turn off all accessories.
4. Increase engine speed to 1,500 RPM.
5. With a scan tool, observe the Battery Voltage parameter in the dash integration module (DIM) data list, engine control module (ECM) data list, and the instrument panel cluster (IPC) data list.
6. Compare the voltages.

Do all of the voltage measure within the specified range?

11-16 V

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

Do all of the voltage measure outside the specified range?

11.5-16 V

Go to Charging System Test

Go to Step 4

Test the battery positive voltage circuit of the affected module for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 7

Go to Step 5

Inspect for poor connections at the harness connector of the affected module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

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Go to Step 7

Go to Step 6

Replace the affected module. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

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Go to Step 7

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Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2