SECURITY Warning Not Operating Properly. GMC Truck GMC C Sierra

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC C Sierra - 2WD 🢒 Body and Accessories 🢒 Theft Deterrent 🢒 SECURITY Warning Not Operating Properly

Step	Action	Value(s)	Yes	No
1	Was the Instrument Cluster System Check performed.	--	Go to Step 2	Instrument Cluster System Check
2	Turn the ignition switch to the ON position. With a scan tool select Instrument Panel Cluster , Special Functions, and command the Security message ON. Does the Security message turn ON and OFF when commanded?	--	Go to Diagnostic System Check - Body Control System	Go to Step 3
3	Replace the Instrument Cluster. Refer to Instrument Cluster Replacement Is the repair complete?	--	Instrument Cluster System Check	--

Step

Action

Value(s)

Yes

Was the Instrument Cluster System Check performed.

Turn the ignition switch to the ON position.
With a scan tool select Instrument Panel Cluster , Special Functions, and command the Security message ON.

Does the Security message turn ON and OFF when commanded?

Replace the Instrument Cluster. Refer to Instrument Cluster Replacement

Is the repair complete?