Speed Alert

WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: No messages being sent on the serial data circuit can be the result of no speed data on the map disc for the road the vehicle is on, a fault with the radio/navigation unit, or a GPS fault. The IPC does not know the difference. Sometimes the navigation system may indicate the vehicle is on the highway (speed limit: 65 MPH), when it is actually on the service road next to the highway (speed limit: 30 MPH). In these situations the IPC will display the highway speed limit. This is not a fault of the IPC, it is receiving the message from the radio/navigation unit. This should be considered as normal operation and the navigation radio or the map disc should not be replaced.

Speed Alert is a feature that notifies the driver of what the legal speed limit is for the street the vehicle is currently driving on. This feature also has the ability to alert the driver of when the speed limit has been exceeded. The driver can scroll through the DIC, in the IPC, to display "Speed Limit: XX MPH" (or "Km/h" for metric setting). This is the legal speed limit. If the vehicle speed exceeds that of the legal limit, a warning of "Speed Limit: XX MPH" will appear on the DIC. The driver can select 4 options relating to speed alert:

Speed Alert: Off
Speed Alert: At Limit (no offset)
Speed Alert: +5 MPH (Km/h)
Speed Alert: +10 MPH (Km/h)

Selections 3 and 4 are an offset for the warning message. Meaning, the warning message will not appear until the vehicle speed has exceeded the legal limit by 5 or 10 mph/kph. If selection 1 is chosen (speed alert: off) then no warning message will be displayed, but the driver can still scroll DIC menu to see what the speed limit is.