Help! I recently had an issue where I received a gear box error, and the car would not start. I tried several things (unhooking battery, hitting reset in passenger side footwell and rocking it back and forth) all to no avail. I had it towed to a nearby service station. The checked the car and found the battery output was 7V. The battery was replaced and the gear box error reset. Now the car will start and drive. However, when the car first died the HDU did not light and after the battery was replaced, the HDU is still dead?? Help