Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Start the engine and allow it to idle for two minutes then turn the engine off.
2. Turn the ignition on.
3. With the scan tool, read DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 2
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
VEHICLE STORED WITH NO BATTERY VOLTAGE FOR EXTENDED PERIOD OF TIME
NOTE:
If the vehicle was stored with the battery disconnected for an extended period of time the back up battery located in the siren may discharge and need to be recharged.

Was the vehicle battery power just restored after the vehicle was stored with no power for an extended period of time?

Yes
- Allow the vehicle to sit with a fully charged battery for two hours then restart this procedure.
No
- Replace the Siren in accordance with the Service Information.
- Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .