(October 5, 2011) DETROIT – Your car sitting idle. Perhaps your unused vehicle can put some cash in your pocket. General Motors is betting on it.

GM and RelayRides, the world’s first peer-to-peer carsharing marketplace, today announced an exclusive relationship that will allow millions of GM vehicle owners to leverage the OnStar system to rent out their idle cars through the RelayRides marketplace.

The program, which will launch in early 2012, is GM’s first large-scale involvement in carsharing and is aimed at making it easier for those without a vehicle to access temporary, affordable and reliable transportation in a Chevrolet, Buick, GMC or Cadillac.

RelayRides allows vehicle owners to choose to rent out their idle vehicles, with the owner controlling the rates and availability of the car. RelayRides provides an online marketplace and a $1 million insurance policy to make the transaction safe and convenient.

Through innovative technology integration, RelayRides will leverage OnStar to allow RelayRides borrowers to unlock GM cars with their mobile phones. For vehicles that are not OnStar enabled, RelayRides must install a small device in the car to provide convenient access to borrowers. The integration makes all eligible OnStar vehicles immediately “RelayRides ready” without having to install additional hardware.

“We’re using technology to make both our older and newest models carshare ready and available for those owners who choose to participate in carsharing,” said Stephen Girsky, GM vice chairman. “Our goal is to find ways to broaden our customer reach, reduce traffic congestion in America’s largest cities and address urban mobility concerns.”

The program initially will promote the relationship through various events and demonstrations in California to showcase GM’s OnStar and RelayRides technology, and will feature Chevrolet vehicles, including the Volt extended-range electric vehicle. Participation in the RelayRides carsharing program is voluntary.

“RelayRides has always worked toward providing the safest, most advanced, peer-to-peer carsharing marketplace, where neighbors can help out one another by making their frequently unused car available to those who live nearby,” said RelayRides Chief Executive Officer André Haddad. “With the new GM relationship, RelayRides can leverage the OnStar technology to make carsharing even more convenient, with nothing more than a mobile app. Carsharing has never been easier.”

Founded in June 2010, RelayRides is currently available in San Francisco and Boston, and plans to strategically expand to U.S. areas that demonstrate high consumer demand.

RelayRides is pioneering the ability to reach various population densities in a more spontaneous and hassle-free manner. According to Innovative Mobility Research, carsharing in North America has grown from 400,000 users in 2009 to 640,000 in July 2011. A study from Frost & Sullivan projects carsharing will have an estimated 4.4 million users by 2016.

RelayRides will leverage OnStar technology through a mobile application to allow customers to check for available vehicles, make a online reservation online as well as check future reservations, locate their reserved vehicle via GPS and lock and unlock the vehicle, all through their smart phone.

“Our experience in mobile app development will be a benefit to RelayRides as they develop their customer app,” said Nick Pudar, vice president of Planning and Business Development, OnStar. “Using OnStar’s technology will help make the carsharing rental process easy and safe for customers, and avoid the hassle of installation of additional equipment on their vehicles.”