Turn Signal On Warning

The radio activates the turn signal on audible warning as requested by the body control module (BCM). The BCM sends a GMLAN message to the radio indicating the chime frequency (single chime in phase with turn signal indicator) and duration (continuous). The turn signal on warning sounds when the following occurs:

• The ignition is ON.
• The BCM detects that the turn signal is active for greater than 1.2 km (0.75 mi). The BCM calculates the distance based on a class 2 message from the powertrain control module (PCM) indicating the vehicle speed.