![Power line audio for the [ [ Opel Corsa D]]](/images/articles/salon/20210412/32dc04b5a30a18be2374c9a31c634361.jpg)
If the Opel Corsa D audio system is replaced by an existing speaker, it is useful to know the pattern of the speakers. Ewires differ in colour when the signal is on the speakers.
Front left: "+" blue, "-" brown with blue stripe.
Rear left: "+" green, "-" green with black stripe.
Rear right: "+" white, "-" blue with black stripe.
Front right: "+" yellow, "-" black with yellow stripe.