GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Check for Powertrain Control Module (PCM) Diagnostic Trouble Codes (DTCs). Refer to Powertrain On Board Diagnostic (OBD) System Check (LX5) or Powertrain On Board Diagnostic (OBD) System Check (L36) in Engine Controls.

Are any PCM DTCs present?

--

Go to appropriate DTC table in Engine Controls

Go to Step 2

2

Was the BCM diagnostic system check performed?

--

Go to Step 3

Go to Diagnostic System Check - Body Control System in Body Control System

3

Attempt to start the engine.

Does the engine start?

--

Go to Step 4

Go to Starting System Check in Engine Electrical

4

The SECURITY indicator lamp is on due to a malfunction in the instrument cluster. Refer to Diagnostic System Check - Instrument Cluster in Instrument Panel, Gauges and Console for further diagnosis and repair of the instrument cluster.

Is the action complete?

--

Go to Diagnostic System Check - Theft Deterrent

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