Technical radio only turns on in reverse help

[sambiddleston]

hi ya
can anyone help me I have a big problem my radio will only turn on when my car is in the reverse gear even when the engine is on/off im not sure why has anyone had this problem before ? and its on a 1.8 hgt 2001
thanks

 

[Eklipze3k]

Is this the standard headunit or aftermarket?

 

[sambiddleston]

its an after market one was working fine when we was installing it but when we started and moved the car that's when this problem started

 

[dave]

i'd check rear light conectors are clean

 

[sambiddleston]

the conections are fine will there be an earth at the back of the car ?

 

[dave]

the earth is in the connector plugs, should be sprayed with contact cleaner, when that end is all fine I'd look at reverse sensor plug