Support for the PVS 9″ MK4
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Display & System
Connectivity & Phone Mirroring
Internet & Navigation
Radio & Media
Audio Outputs & Processing
Cameras & Video
Vehicle Integration
Power & Wiring
Fitment
In the Box
Tutorial Videos
FAQ
Installation
Will the MK4 Fit My 70 Series? What’s in the Box?
Check the dash opening before you take the factory radio out. The MK4 fits the 200 mm opening on the supported late-2009+ 70 Series, not the narrow early steel-dash slot. Unbox the harness, fascia, mic and hardware first, and photograph the opening if you're not sure.
How Do I Remove the Factory Radio and Fit the MK4 Fascia?
If your clips won't bite, or you get a gap along one edge on MK4, you've usually got the trim order wrong or the loom bunched behind the stack. Re-offer the assembly square, relieve the harness bulk, then clip evenly before the final screws.
Where Do the MK4 Power and Speaker Wires Go?
If your screen or speakers are dead straight after you plug in, the constant, ACC or earth usually doesn't match the PVS LC70 diagram, or a plug isn't fully latched. Follow only that loom sheet, then re-seat every terminal before you decide the unit's faulty.
The Supplied Harness Doesn't Match the Plugs in My Dash
Nothing's missing from your kit. Our harness ends in the factory headunit plugs for your vehicle, so if nothing mates, an earlier aftermarket stereo install has removed or cut out your factory plugs. Either unplug that old loom to get back to them, or have an auto electrician reinstate the factory plugs.
First Time on: Wi‑Fi, Updates, and Microphone
Most first-boot trouble is Wi-Fi, a wrong date and time, Google sign-in in a bad webview, or a mic test you ran before the plug was seated. If Wi-Fi won't join or the Wi-Fi screen sticks, try a hotspot, forget the network, then get real internet on it. Skip the sign-in and add the account under Settings, Skip the mic test if the wizard lets you, and use PVS firmware only.
Phone Connectivity
CarPlay or Android Auto Keeps Dropping (Wireless)
Pair from the MK4 menus with a known data USB cable ready. Forget the stale Bluetooth entries on your phone, then strip out the Bluetooth gadgets you don't need for one test drive. That settles most unstable wireless CarPlay or Android Auto you'll get on the MK4.
CarPlay Won’t Connect the First Time
Your first CarPlay connection on the MK4 usually needs a clean wired pass. Plug an Apple-certified data cable straight into the unit, clear any stale cars from your iPhone CarPlay list, then take the phone past the lock screen and accept the prompts. Add wireless only after you've had one good wired session.
My Phone Won’t Pair (Bluetooth, CarPlay, or Android Auto)
Delete the MK4 from your phone's Bluetooth list and from the CarPlay/Android Auto car list. Reboot the phone and the headunit, then pair again from the MK4 wizard with a known-good data cable.
CarPlay Keeps Disconnecting
If your wireless CarPlay drops mid-drive, a clean re-pair usually sorts it. Forget the car in your iOS CarPlay settings, delete the MK4 from Bluetooth, reboot your phone and the unit, then pair again. Test with a short Apple-certified cable after that.
CarPlay Keeps Taking Over Wi‑Fi (Starlink Issue)
Use wired CarPlay for projection and leave your phone on Starlink (or another router) for data. You can also turn off auto-join on the headunit Wi-Fi so your iPhone stops jumping networks.
Android Auto Not Connecting
If Android Auto won't start, it's usually the app, the cable or a stale pairing. Update Android Auto, use a proven data USB-C cable, turn off aggressive battery optimisation for Android Auto and Bluetooth, then pair again from the headunit.
External Microphone Issues (Calls / Voice)
Most external mic trouble on your MK4 comes down to where you've mounted the mic and wind noise, a half-seated mic jack, or Android and CarPlay refusing mic permission. Reseat the plug, reposition the mic to the first-boot guidance, then retest with a voice memo parked. Re-allow the microphone for your phone projection apps.
Internet & SIM
No Internet on the MK4 (Wi‑Fi, SIM, or Hotspot)
If your MK4 shows connected on Wi-Fi but nothing loads, it's usually a captive portal, the wrong MVNO APN or a SIM tray that isn't making contact. Open the MK4 browser to finish camp logins, power off before you re-seat the SIM, and enter the APN details exactly as your carrier publishes them.
GPS Inaccurate, Slow Lock, or Weak Signal
If your GPS is weak or wrong on the MK4, it's usually low-accuracy location mode, missing permissions for your maps app or Google Play services, a wrong automatic clock, or the vehicle blocking the sky. Turn on high-accuracy location, fix the clock, grant the permissions, then check it with a short drive in the open.
Cameras
How Do I Wire Reverse and Extra Cameras to the MK4?
Your MK4 camera install goes wrong fastest when the AHD or CVBS setting doesn't match your camera, or when you take reverse sense off a PWM tail tap. Set the format to the camera, meter the trigger at the MK4 loom, and fully latch any 28-pin style adapter. Want a camera running full time, not only in reverse? The reverse input only shows while you're actually in reverse, so wire that camera to the aux video input, the yellow RCA on Harness A, then select it from the headunit source button and leave it on as long as you like.
Reverse Camera Shows Black Screen
If your reverse screen opens but stays black, that's very often an AHD and CVBS mismatch. Toggle the camera format in MK4 settings, reboot once, then test again in reverse.
No Reverse Camera Showing When in Reverse
On the MK4 the reverse trigger is pin 5 (BACK_CON) on the 16-pin main plug, and the wire is pink. If your camera is the factory Toyota one, there's no trigger wire to connect, because reverse already arrives on Connector 3. Check the right physical camera input is assigned as reverse in settings before you chase a wiring fault.
Reverse Camera Won’t Come On, or the Picture Is Wrong
Match your symptom first: black or “no signal” with the camera page open goes to the black-screen guide, and no switch from radio or maps goes to the no-display guide. If your picture's wrong or rolling, cuts in and out, or you want the full adapter, trigger and format checklist, start here.
Reverse Parking Guidelines Missing
If you get no parking lines on the MK4, your camera usually doesn't output overlays the unit can draw, or the feature is switched off in the camera settings. Turn guidelines on in the MK4 menu, then check your camera actually supports lines. Some factory Toyota overlays won't carry across to an aftermarket headunit.
Audio
No Sound from Speakers
Most of the time you're muted or turned right down on the MK4, a speaker plug is loose, or your retained factory amplifier isn't waking because the turn-on or integration leads are wrong. Check those before you swap any hardware.
Bluetooth Connects but No Audio
If your Bluetooth pairs but stays silent, media audio is usually switched off on your phone's Bluetooth profile, or the volume sits at zero on the phone while projection holds the audio. Turn media audio on, then raise the volume on both your phone and the MK4.
Steering Controls
Steering Wheel Buttons Don’t Work with My MK4
If you've got the factory LC70 wheel, your audio keys use the OEM Android steering-learn path. With a PVS aftermarket wheel kit you need the bundled wireless receiver and its learn sheet. A bare MK4 doesn't ship that receiver, so check which wheel you've got before you chase settings.
Steering Wheel Controls Not Responding
If your wheel buttons don't work on the MK4, that's usually a learn or pairing issue, not a failed radio. Open steering-key learning in Android settings, then complete the wireless kit learn sequence from your wheel instructions.
Troubleshooting
My MK4 Won’t Turn On, or It Keeps Restarting
If your MK4 won't power up, it's most often a low battery under load, a blown fuse or ACC/constant/earth not correct at the harness. Meter the radio plug against the PVS wiring diagram before you open the radio.
MK4 Firmware & Software Updates (PVS)
Check your build under Settings → About. Only flash USB packages PVS gives you for your MK4, keep the engine running and leave the stick in until the unit reboots itself, then key-cycle. Never flash random Android images and never pull the USB mid-update.
USB Drive or Device Not Recognised
When your MK4 ignores USB storage you've plugged in, rule out charge-only adapters and NTFS-only sticks first. Try a small exFAT or FAT32 flash drive straight in the port with shallow folders, clean the socket, and skip unpowered hubs.
Battery Drain after MK4 Install
If your vehicle's 12 V starter battery drains faster since the MK4 went in, you've usually got ACC and constant swapped, or accessories piggy-backed on the radio feed. Meter the parasitic draw at the vehicle, then re-check your harness against the PVS diagram. Unplug USB gadgets from the headunit overnight to find the thief.
Headunit Has Power but Won’t Turn On
If you get lights but Android never finishes booting, unplug every USB add-on. Check that both constant and ACC are right on the main harness. Then give it one long first boot before you call it a hardware fault.
Unit Resets or Freezes
Random reboots or freezes are often unstable supply voltage or a bad USB device. Unplug every USB accessory from your MK4, then check battery voltage under real load before you look for software causes.
How-To Guides
How to Trim the Dash Tabs When Fitting a 9 Inch Head Unit
If your 9 inch unit won't stay in and keeps popping back out, it's almost always the four plastic tabs in the dash opening, not a faulty unit. They hold it proud, so the lower clips never reach far enough to engage. Check the lower clips are intact, then cut the four tabs flush with side cutters. It's the same four tabs on the MK3 and the MK4.
How to Install an App on an Android Head Unit
The MK4 runs Android 13 with the Google Play Store on it, so you install apps the same way you would on a phone. Sign in to a Google account first. If the Play Store won't work for you, it's almost always that step or old software.
How to Pair a Bluetooth OBD2 Adapter to an Android Head Unit
Plug the adapter into the diagnostic port, then pair it under Settings and Bluetooth on the head unit before you open any diagnostics app. An app can't see an adapter you haven't paired yet, and that's the order almost everyone gets wrong.
How to Install and Set Up Torque Pro on an Android Head Unit
Pair your Bluetooth OBD2 adapter under Settings first, then install Torque Pro from the Google Play Store and point it at that adapter. Torque can't find an adapter your head unit hasn't already paired.
How to Switch Between Apple CarPlay, Android Auto and HiCar
Your unit opens in Apple CarPlay mode by default. To change it, open the PVS Link app, tap the four square apps icon, then select Android Auto or Huawei HiCar. If your phone pairs but nothing opens, you're almost always still in the wrong mode.
How to Get an Android Head Unit Online
Three ways. Put a SIM in the card slot and make sure the 4G antennas are connected, join a WiFi or Starlink network under Settings, then WiFi, or turn the hotspot on at your phone and join that. You need one of the three before the Play Store or any online app will work.
How to Run CarPlay at the Same Time as Starlink or a Hotspot
Your phone's WiFi radio can only be on one network at a time, so a phone running wireless CarPlay can't also stay on Starlink or another hotspot. Plug the phone in and run CarPlay wired over USB instead. Wired CarPlay doesn't use your phone's WiFi at all, so your phone stays on the other network.
How to Set Up Hands-Free Calling and Fit the Microphone
Open the Bluetooth app on the head unit, tap Search, pick your phone and press Connect, then confirm the pairing on both. The external microphone comes in the box and plugs into the 3.5mm socket on Harness A. Where you mount it decides how you sound, far more than any setting does.
How to Set Up Navigation and Offline Maps for Areas with No Signal
Your unit has its own GPS receiver, so it knows where it is with no phone and no mobile signal. What it can't do without a connection is download a map it's never seen. Install the app and download the areas you're heading into while you've still got WiFi.
How to Choose the Right Audio Output on an Android Head Unit
Your unit puts out four speaker channels from its internal amplifier, 5.1 channel RCA pre-outs at 4 volts RMS, and two digital outputs. Which one you use depends on what your amplifier or processor will take.
How to Connect an External Amplifier to an Android Head Unit
Your front pre-outs are the white and red RCAs on Harness A, pins A4 and A6, and your rear pre-outs are the white and red RCAs on Harness C, pins C3 and C4. The amplifier turn-on lead is the blue wire on A1. Harnesses A and C ship with the unit, and you only connect them if you're running an amplifier.
How to Add a Subwoofer to an Android Head Unit
The subwoofer output is A16 on Harness A. You get two green RCA plugs off it, both carrying the subwoofer signal. It's a dedicated output, so you keep both the front and rear pre-out pairs. The turn-on lead is the blue wire on A1, the same one you'd use for an external amplifier.
How to Connect a DSP Using the Digital Audio Output
You've got two digital outputs. The optical SPDIF socket is on the rear panel of the unit, and a coaxial SPDIF output sits on C6 of Harness C on a brown wire. Use whichever one your processor has an input for. You don't need either one for a standard install.
How to Set Up a Reverse Camera on an Android Head Unit
If you've got a factory Toyota camera, there's no trigger wire to run. Your camera plugs into Connector 3, and the video comes back out on Connector 10 as a yellow RCA. Plug that RCA into the reverse camera input on Harness F. An aftermarket camera is the only one where you run a trigger.
How to Add a Second Camera for a Trailer or a Front View
You get two video inputs on a standard MK4. Reverse uses the camera input on Harness F and switches over by itself. The second is the auxiliary video input on A18, the yellow RCA on Harness A, and you select it yourself from the source list. Reverse still takes over the moment you shift into reverse.
How to Program Steering Wheel Buttons on an Android Head Unit
Open the SWC app, select the function on screen, press the matching steering wheel button once, repeat for every button, then press Save. Press each button once. Holding it is only used when you're assigning a long press secondary function. The key button on the wireless module isn't part of this: the modules ship already paired, and you do all the mapping on the head unit.
How to Update the Software on an Android Head Unit
Format a USB drive to FAT32, copy the update file onto it, plug it in with the ignition on, then follow the prompt. The drive has to be FAT32 and the capacity doesn't matter. The update performs a factory reset, so your apps reinstall and you'll add your Google account again afterwards.
How to Factory Reset an Android Head Unit and What You Lose
Open Settings, then System, then Reset. It wipes every app, every login, your Bluetooth pairings and any setting you changed, and gives you back the unit as it left the factory. Set the clock before you sign in to Google afterwards, or the sign in fails with an error that never mentions the clock.
How to Check Whether a Head Unit Is Draining the Battery
Your unit takes two supplies: a permanent one on pin 2 that holds your settings and the clock, and a switched accessory one on pin 3 that comes on and off when you turn the key. To find out whether it's draining your battery, measure the current draw at the fuse for the head unit circuit with everything switched off.