1. Turn the ignition switch from the OFF position to the ON position.
2. Connect a Scan Tool into the diagnostic link connector (DLC).

Does the scan tool communicate with the body control module (BCM)?

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Go to Step 3

Go to Step 2

Refer to Data Link Communications System Check in Data Link Communications.

Could you establish communication?

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Go to Step 3

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1. Place the Scan Tool menu in Body Functions.
2. Using the scan tool, read the DTCs from the body control module (BCM).

Do any current diagnostic trouble codes exist?

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Go to Diagnostic Trouble Code (DTC) List/Type

Go to Step 4

1. Remove the Scan Tool from the DLC.
2. Cycle the ignition from the OFF position to the CRANK position.

Did the SECURITY indicator turn ON then OFF?

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Go to Step 6

Go to Step 5

Does the SECURITY indicator stay ON or FLASH?

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Go to Theft Deterrent Diagnostic Information

Go to Step 6

Are any DTCs in history?

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Go to Step 7

Go to Step 8

1. Refer to the appropriate DTC table for the history DTC.
2. Read the diagnostic aids. Read Condition For Setting The DTC.

Did the history DTC set as a current DTC?

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Go to Diagnostic Trouble Code (DTC) List/Type

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Does the vehicle start and run?

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System OK

Go to Powertrain On Board Diagnostic (OBD) System Check