FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM: Car repair manuals for everyone.

Shift Indicator Tone

When the vehicle reaches a speed of 120 km/h (75 mph) in a gear other than overdrive, the Powertrain Control Module (PCM) sends a ground signal through Circuit 462 (P) to the integrated control module. The integrated control module then emits a high pitch tone.