Control Module, & Component Power & Grounds

Many vehicles have multiple circuits supplying power to control modules. Other components may have separate power circuits that may also need to be tested. Check connections at module or component connectors, fuses, and any intermediate connections between power source and module or component. Ensure that circuit can carry current necessary to operate component. Test all control module ground and system ground circuits. Control module may have multiple ground circuits. Other components may have separate grounds that may also need to be tested. Check grounds for clean and tight connections at ground connection. Check the connections at the component and in splice packs, where applicable. Ensure that circuit can carry current necessary to operate component.