em1 abs diagnostic lights

[vinnY]

so i decided to find out whats the go with my abs, i've come up with the codes; 12, 14, 16, 18, 54, 61

12	Short circuit in right hand front wheel speed sensor
14	Short circuit in left hand front wheel speed sensor
16	Short circuit right hand rear wheel speed sensor
18	Short circuit left hand rear wheel speed sensor
54	Inoperative relay
61	Low supply voltage

now i assume i have to replace the relay(not sure where this is located?) and sort out the low supply voltage trouble(would be handy to have some help on this too) before i look into the short circuits on the speed sensors

anyone able to help me out?

oh and fyi, em1 diagnostic plug is located under the glove box next to the centre console not the kick panel. big blue plug with 2 blue connectors(one with 3 wires, one with 2), the 2 wire plug should have a brown and black wire stickin' out of it