the back up relay "clicks" but NOTHING ELSE works. on 2002 Chevrolet Impala

I turned the key, the lights came on then immediately went off and something in the dash started "clicking". On investigation, the owners manual calls the clicking item a back-up relay. It continues to click even when you turn off the key. Have a code reader but I guess it doesn't work unless the engine is running.

Asked by for the 2002 Chevrolet Impala
code reader will not help,ck voktage at relay. should have approx 12.2v
1 more answer , 1 more comment
Im just assuming that your battery voltage is too low...have your battery checked and repost.
Hooked it up with jumper cables, still got nothing. Don't have meter. Will buy one tomorrow. Thank you. Will reply with results. Thanks again!!!!!!!!
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