You got your pride and joy back from the garage after some body work, engine or gearbox and you now discover you have with multiple electrical problems for free. What causes these issues? The culprit could be a bad earth or ground as some people refer to it . If a earth is loose, corroded, painted over, or disconnected, it can cause all sorts of electrical problems with systems and components. Here’s just a sample of what could happen: • The audio unit or the navigation unit cuts in and out. • Instrument panel gauge needles swing back and forth. • Power windows, power door locks, or turn signals stop working. • System indicators come on (with or without DTCs). • The HDS or DTC code readers can’t communicate with the vehicle. • Wipers and washers come on with the headlights. • The engine cranks but won’t start. • The cruise control turns off. A bad earth can come from sloppy workmanship at a body shop. In reality earth points aren’t always masked whilst preparing the the vehicle for painting, so you can end up with primer and paint on the body and threads, which acts like an insulator. A bad earth can also come from earlier work on the engine or gearbox, or from installation of an aftermarket accessory. These earth/grounds are often the culprits: • Battery negative terminal and body earth locators. • Headlight, turn signal, wiper and washer, tail lamps, and brake light common earth. • ABS/TCS/VSA earth. • ECM ground G101 on the engine. • Transmission\Gearbox earth points , solenoid earth (if applicable in some auto boxes). To find and fix these problems, here’s what you need to do: 1. Refer to workshop manual or your owners manual for the electrical diagram and look up the earth\ground distribution section, and look for the ground(s) that are related to the symptoms you’re seeing. 2. Inspect each ground. Make sure it’s got a non-anodized, cutting-type bolt; the threads aren’t corroded or painted over; there’s no burr washer being used; and the bolt is nice and snug. 3. If all fails after this get to a Honda dealer or an auto electrician to carry out parasitic drain test and measure the voltage drop at each affected ground.