Diagnostic Test

DETERMINING IF DIAGNOSTIC TROUBLE CODE (DTC) IS CURRENT
1. With a scan tool, read and record DTCs.
2. With the scan tool, clear DTCs.
3. Start the engine and allow it to idle for 2 minutes then turn the engine off.
4. Using the scan tool, read DTCs.
  Does the DTC reset?
  
  Yes
  - Go to Step 2.
  No
  - DTC is not active at this time. Test complete.
VEHICLE STORED WITH NO BATTERY VOLTAGE FOR EXTENDED PERIOD OF TIME
NOTE: If the vehicle was allowed to sit with no battery voltage 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 WIN VERIFICATION TEST. Refer to DTC-Based Diagnostics/NODE, Wireless Ignition (WIN) - Standard Procedure .