Owner's Manual (pdf)
Page 66
.... If you have pressed the Reset button or if you have disconnected the Receiver from battery... 1 Enter the correct security code [Security Code Set] Displays the Security code input screen. [SI] Turns the SI function on the front panel flashes when the vehicle ignition is displayed. 4 Enter a security Code Input four-digit number. 5 Register your security code 66 DNX7140/DNX7000EX/DDX714/DDX7034BT
.... If you have pressed the Reset button or if you have disconnected the Receiver from battery... 1 Enter the correct security code [Security Code Set] Displays the Security code input screen. [SI] Turns the SI function on the front panel flashes when the vehicle ignition is displayed. 4 Enter a security Code Input four-digit number. 5 Register your security code 66 DNX7140/DNX7000EX/DDX714/DDX7034BT