A blue/white wire is often present for an electric aerial feed. If the radio doesn't power off correctly, some installers suggest leaving certain auxiliary wires (like the white/blue) open rather than joining them to the main loom.

Simply enter the 4-digit code using the preset buttons in sequence (e.g., press '1', then '2', then '3', then '4'). The unit should unlock automatically.

Equipped with a 4-digit anti-theft security code system. Essential Operations and Troubleshooting

Typically uses a color-coded harness (e.g., White/Red for Left Front +, Brown/Red for Right Front +). Collectors' Market and Restoration

While modest by modern standards, the PU-9469A was a high-tier unit for its time:

If the display shows four static numbers, the unit is locked due to too many failed attempts. You must leave the radio switched on for up to three hours until the screen clears before attempting again. 2. Wiring and Installation

Its design featured a sleek, black single-DIN faceplate with a green-illuminated display that matched the instrument clusters of the time. Technical Specifications