For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 |

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)?

--

Go to Step 3

Go to Step 2

2 | Refer to Diagnostic System Check - Data Link Communications in Data Link Communications. Could you establish communication? | -- | Go to Step 3 | --
3 |

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?

--

Go to Diagnostic Trouble Code (DTC) List/Type

Go to Step 4

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?

--

Go to Step 6

Go to Step 5

5 | Does the SECURITY indicator stay ON or FLASH? | -- | Go to Theft Deterrent Diagnostic Information | Go to Step 6
6 | Are any DTCs in history? | -- | Go to Step 7 | Go to Step 8
7 |

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?

--

Go to Diagnostic Trouble Code (DTC) List/Type

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8 | Does the vehicle start and run? | -- | System OK | Go to Powertrain On Board Diagnostic (OBD) System Check 2.4L or Powertrain On Board Diagnostic (OBD) System Check 3.1L