If the PASS-Key® III module measures an invalid transponder value for 30 consecutive seconds after the engine is running, the PASS-Key® III module sends a message to the RFA module in order to illuminate the SECURITY indicator until the PASS-Key® III module determines that the problem is corrected. The PASS-Key® III module may allow the vehicle to restart during this condition.

If the VTD module detects a problem in the PASS-Key® III while the engine is running, the SECURITY indicator illuminates for the first 30 seconds of each ignition cycle until the condition is corrected.

In order to control the SECURITY indicator, the PASS-Key® III module sends a message to the RFA module via the class 2 serial data line. The RFA module illuminates the SECURITY indicator by grounding terminal B5 (CKT 264, DK GRN).