How to Use Wired CarPlay with Zlink
The short answer
Zlink is a phone-projection app found on many aftermarket Android-based head units. It lets the car's screen run Apple CarPlay, which mirrors a simplified, driver-focused iPhone interface on the stereo display. To use CarPlay over a cable, enable CarPlay on the iPhone, connect the phone with a data-capable cable to the head unit's USB port that supports phone projection, open Zlink if it does not launch automatically, and accept the prompts on the iPhone. When the CarPlay home screen appears on the car display, the connection is working.
Two conditions can change this. First, Zlink is built into many different head units from different makers, so menu names, default modes and which USB port handles CarPlay vary by unit and firmware version. Second, some units need a separate CarPlay adapter or dongle, or support only wireless CarPlay. No model-specific specifications were available for this guide, so check your head unit's manual or seller documentation for your exact unit.
What you need before you start
An iPhone that supports CarPlay, with a reasonably current iOS version. A head unit that runs Zlink and lists wired CarPlay as a supported feature. A cable that carries data, not just charging current: Lightning to USB or USB-C to USB, depending on the phone and the head unit's port. An Apple or Apple-certified (MFi) cable is the most reliable choice. Access to the head unit's USB port intended for phone connection. Some units have several ports, and only one may support CarPlay. The vehicle parked, with the ignition or accessory power on so the head unit is running.
Step-by-step: connecting wired CarPlay through Zlink
Do the setup while the vehicle is parked. Working through prompts on the phone or the head unit while driving is a distraction hazard.
1) Make sure CarPlay is allowed on the iPhone. Open Settings, then Screen Time, then Content and Privacy Restrictions. If restrictions are on, check that CarPlay is permitted under Allowed Apps. Also make sure Siri is enabled, because CarPlay relies on it for voice control. 2) Unlock the iPhone. Many first-time connections fail because the phone is locked when the cable is plugged in. 3) Plug the cable into the head unit's phone or CarPlay USB port, then into the iPhone. If the unit has more than one port, check the labels or the manual. A port meant only for media files or charging may not start CarPlay. 4) Open Zlink on the head unit if it does not launch on its own. On many units it starts automatically when a compatible phone is detected. 5) If Zlink offers a choice of connection mode, such as wired or USB versus wireless, select wired. The setting's name and location depend on the firmware. 6) Respond to the iPhone prompts. iOS may ask whether to allow CarPlay, including whether to allow it while the phone is locked. Accept the prompts you want. If you decline, CarPlay may not start or may only work while the phone is unlocked. 7) Wait for the CarPlay interface to load on the car screen. This can take several seconds on the first connection.
How to confirm it worked
The CarPlay home screen, with app icons and a dock, appears on the head unit display. Touching the icons on the car screen opens apps such as Phone, Messages, Maps or music. Audio from the phone plays through the car speakers. On the iPhone, Settings, then General, then CarPlay lists the vehicle or head unit. Unplugging and reconnecting the cable brings CarPlay back without repeating the full setup.
If wired CarPlay does not start
Try a different cable. Worn, damaged or charge-only cables are a common cause of failed or dropping connections. Try another USB port on the head unit. Only certain ports may support projection. Restart the iPhone and the head unit. If the head unit has no restart option, switch the vehicle off and back on. If the phone was previously paired for wireless CarPlay, it may try to connect wirelessly instead. Turn off Bluetooth temporarily, or remove the vehicle under Settings, then General, then CarPlay, and connect again by cable. Check that CarPlay has not been blocked under Screen Time restrictions, and that Siri is on. Update the iPhone's iOS and, if the seller or manufacturer provides one, the head unit or Zlink firmware. Install updates only from the unit's manufacturer or seller, because the wrong firmware can disable the unit. If a supported phone, a known-good cable and the correct port still fail, the unit may lack wired CarPlay support or need an adapter. Contact the head unit's seller or manufacturer.
When to stop and get professional help
Connecting a phone by cable is a user task. Installing, removing or rewiring the head unit, adding or rerouting USB extension cables behind the dashboard, or diagnosing power faults is different work. It involves the vehicle's electrical system and trim, and on many vehicles it is close to airbags and other safety systems. If the head unit loses power, shows signs of overheating, or a USB port appears physically damaged, stop using it. Have a qualified car audio installer or automotive technician inspect it.
What this guide could not confirm
No evidence was available about specific Zlink versions, head unit models, supported iOS versions, menu layouts or cable specifications. The steps above use general CarPlay and iPhone behavior. Where your unit's documentation differs, especially on port assignment, connection-mode settings or firmware updates, follow the manufacturer's instructions for your exact head unit.