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

Was the BCM diagnostic system check performed?

--

Go to Step 3

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

1. Perform the theft deterrent re-learn procedure. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System for procedure.
2. Attempt to start the engine.

Does the engine crank and start?

--

Go to Step 4

Go to Step 5

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

--

1. Replace the BCM. Refer to Body Control Module Replacement in Body Control System for service procedure.
2. After BCM replacement, perform the Setup New BCM procedure. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.

Is the repair complete?

--

Go to Step 6

--

1. Turn the ignition switch off.
2. Reinstall connectors/components removed.
3. Check for BCM current DTCs. Refer to Diagnostic Trouble Code (DTC) Displaying in Body Control System.

Are there any BCM current DTCs present?

--

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

System OK