Turn Signal On Warning

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

The instrument panel cluster (IPC) activates the turn signal on audible warning as requested by the body control module (BCM). The BCM sends a GMLAN message to the IPC 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.