Start by using a multimeter to check that there's actually power to all of the relevant leads. (There might be two, or even three, 'positive' supplies required). If there isn't, investigate any possible causes, such as a dud fuse. (A visual check is often all that's needed to see if a fuse has 'blown'; otherwise use the multimeter's resistance setting to show...
Start by using a multimeter to check that there's actually power to all of the relevant leads. (There might be two, or even three, 'positive' supplies required). If there isn't, investigate any possible causes, such as a dud fuse. (A visual check is often all that's needed to see if a fuse has 'blown'; otherwise use the multimeter's resistance setting to show that there's almost no resistance across the terminals).
Check also that there's a good bond (i.e. almost zero resistance) between the earth lead(s) and the body of the car.
I was assuming that nothing at all happens when the radio is connected up, the ignition switch is turned to the first position and the radio is turned on. If, instead, the word 'Code' (or a string of dashes) appears then, obviously, you need to enter the security code for the radio to get it working.
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