Issue: The power cable does not match the original vehicle connector.

Solutions:

• If your original car plug is a large Quadlock plug, you can directly use our standard power cable.
• If your car uses an ISO plug, you’ll need the special Plug-B for ISO: Product link.
• If your car has an MQB plug, this unit is not compatible. Please switch to RCD360 PRO2 or RCD360 PRO3S.

Issue: The original car wiring has been modified or previously customized, causing incompatibility (especially CAN signal mismatch).

Solution: Please contact customer service and send a clear photo of your original car plug so we can identify the correct solution.

Purpose: This test measures the vehicle’s standby (parasitic) current and helps you confirm whether there is a battery drain risk after installation.

Tools required:

• Digital multimeter (must support 10A current range)
• Wrench (to disconnect the battery negative terminal)

Step 1: Let the vehicle enter sleep mode

1. Ignition OFF
2. Close all doors, trunk, and hood
3. Lock the vehicle
4. Wait 15–30 minutes

Step 2: Measure standby current (series connection)

1. Open the engine bay
2. Disconnect the battery negative terminal
3. Set multimeter to 10A current mode (start from 10A to avoid blowing the fuse)
4. Connect the multimeter in series:
   • Red probe to the battery negative post
   • Black probe to the vehicle negative cable

Result reference:

• ≤ 50mA: Normal
• 50–100mA: Elevated (monitor recommended)
• ≥ 100mA: Abnormal (battery drain risk)

How to confirm if the head unit is involved:

• Unplug the head unit power connector and test again
• If current drops significantly, the head unit is part of the draw path

Need help? Please email us with your car model/year and clear photos of your original plug and wiring: service@scumaxcon.com

Issue: The stereo does not completely shut down after turning off the ignition. Common symptoms include:

• The stereo can still be powered on after removing the car key.
• The button backlight stays illuminated.
• CarPlay remains connected even when the vehicle is off.

Cause: This is not caused by the head unit itself. It is often due to an outdated CAN Gateway that fails to transmit the shutdown signal correctly via CAN communication.

Diagnosis checklist:

1. Headlight sync test: turn headlights on/off — does button backlight respond? → If yes, CAN is partially working.
2. Bluetooth test: if Bluetooth works normally, some signals are working but shutdown communication may be missing.

Solution: Use the yellow power drain fix wire:

• If it was not included, please contact us — we’ll send it free of charge.
• Follow the wiring instruction video below.

Issue: Weak or no FM/AM signal. Common symptoms:

• Weak or no signal
• Very few stations during auto-scan
• Static or noise during playback

Product specs:

• AM: 530 – 1600 KHz
• FM: 87.5 – 108 MHz

Possible causes & solutions:

1. Check antenna connection: ensure firmly connected; try reversing/flipping the antenna connector direction.
2. Adapter may be needed: if your connector matches the image below, you may need an additional adapter.

Double Fakra  |  Double Separate Fakra

Issue: Your iPhone is not connecting to the CarPlay system.

Troubleshooting steps:

1. Check the USB cable:
   • Make sure the cable is properly recognized by the stereo.
   • Try several different original Apple cables to rule out cable issues.
2. Check your iPhone system:
   • Try resetting phone settings or testing with another iPhone to determine if the issue is phone-related.
3. Check the USB port:
   • Ensure the USB port is not loose or damaged.
   • Try gently adjusting the cable to see if the connection is intermittent.

Still not working? Please contact us for further assistance — we’re here to help.