Nissan X-Trail T31 (2007-2013) is one of the most popular crossovers on the aftermarket, but its stock audio system often requires an upgrade. Owners are faced with the need to replace the radio with a more modern one, add a rear view camera or integrate Apple CarPlay/Android Auto. The main problem with this is the correct pinout of the connectors, since an incorrect connection can lead to a short circuit, failure of the amplifier or even the body control unit (BCM).

In this article you will find full pinout diagram head unit Nissan X-Trail T31 indicating the colors of the wires, the purpose of each contact and connection features. We will analyze both connector standards - ISO (European) and OEM (original Nissan), and we will also give recommendations on adaptation for non-standard head units. The material is based on official service manuals and tested in practice by auto electricians.

Standard radio connectors Nissan X-Trail T31: ISO vs OEM

B X-Trail T31 Two types of connectors are used to connect the radio:

  • 🔌 ISO connector (standard DIN 75490) - found in basic configurations or after replacing with a universal radio. Consists of two parts: A (power and speakers) and B (control, antenna).
  • 🔧 Nissan OEM connector — original 20-pin connector (marking 28380-4M000 or analogues), which is used in standard audio systems with a display or navigation.

The main difficulty is that even within one generation T31 The pinout could differ depending on the year of manufacture and configuration. For example, in cars 2007–2009. with the system Bose The speaker connection diagram is different than in standard audio systems. It is also important to consider the presence CAN buses (contacts CAN-H And CAN-L), which is responsible for integration with on-board electronics (displaying tracks on the dashboard, control from the steering wheel).

If your radio has OEM connector, to connect a universal head unit you will need adapter (For example, Nissan 28380-4M000 → ISO). You can purchase it ready-made or solder it yourself, but in the latter case, be sure to check the correspondence of the contacts according to the diagram below.

📊 Which connector is used in your X-Trail T31 radio?
  • ISO (European)
  • OEM Nissan (original)
  • I don't know, haven't checked
  • Another option

Pinout of the ISO connector of the radio Nissan X-Trail T31 (basic equipment)

The ISO connector consists of two parts: ISO-A (left side, power and speakers) and ISO-B (right side, controls and antenna). Below is the standard pinout for radios without a system Bose and additional amplifiers.

Contact Wire color Purpose Notes
A1 Red ACC (ignition) +12V with ignition on
A2 Orange Illumination +12V when the dimensions are turned on (for button illumination)
A3 Black Ground (GND) The general disadvantage is that it must be securely fastened
A4 Yellow BATT (constant +) +12V constant (memory power supply)
A5 Blue/white ANT/REM Antenna control (if available)

The following pins are used for the speakers (colors may vary by year):

  • 🔊 A6 — Green: Front left (+)
  • 🔊 A7 — Green/black: Front left (–)
  • 🔊 A8 — White: Front right (+)
  • 🔊 A9 — White/black: Front right (–)
⚠️ Attention: Complete with system Bose The speaker wires do not go directly, but through an external amplifier. Connecting a non-standard radio in this case requires bypassing the amplifier or using a special adapter (for example, Nissan Bose Adapter).

Disconnect the negative terminal of the battery|Check the voltage on the wires BATT And ACC multimeter|Compare wire colors with diagram (may vary)|Use heat shrink tubing to insulate twists-->

OEM connector pinout Nissan X-Trail T31 (20 pin)

Original connector Nissan has 20 contacts and is used in radios with display, navigation or system Bose. Its pinout is much more complicated, since it includes lines CAN buses, climate control (in some trim levels) and additional audio outputs.

Below is the pinout for radios with navigation (for example, Nissan AVN):

Contact Wire color Purpose
1 Red ACC
2 Yellow BATT
3 Black GND
10 Green CAN-L (low CAN bus level)
11 Purple CAN-H (high CAN bus level)

To connect a universal radio to OEM connector an adapter will be required. The most popular options:

  • 🔌 Adapter Nissan 20pin → ISO — allows you to connect a radio with an ISO connector, but the functionality of the CAN bus is lost (control from the steering wheel, display on the dashboard).
  • 🔧 Adapter with support CAN-Bus (For example, Connects2 CTNI001) - retains integration with the on-board system, but requires additional configuration.
⚠️ Attention: When connecting a radio without support CAN buses An error light may appear on the dashboard Audio Error. In this case, you must either use an adapter with CAN emulation, or disable the check in the block BCM (diagnostic equipment required).
How to check the functionality of the CAN bus?

To check the CAN bus, connect a multimeter in resistance measurement mode between the contacts CAN-H (purple) and CAN-L (green). Normal resistance - 60 ohm. If there is no resistance or tends to infinity, a break or disconnected unit is possible BCM. You can also use an oscilloscope to check the presence of a signal (frequency ~500 kHz).

Features of connecting speakers in Nissan X-Trail T31

B X-Trail T31 used 4 speakers as standard and 6–8 speakers in systems with Bose. It is important to consider the following nuances:

  • 🔊 Front speakers: standard size 165 mm (6.5 inches), resistance 4 ohm.
  • 🔊 Rear speakers: size 130 mm (5.25 inches), in some configurations - coaxial (with tweeter).
  • 🔧 In systems Bose The speakers are connected through an amplifier located under the front passenger seat. Direct connection to the radio without bypassing the amplifier will result in no sound.

If you are installing a non-standard radio, it is recommended:

  1. Test the speaker wires with a multimeter to ensure correct polarity.
  2. Use capacitors to protect tweeters (if they are directly connected).
  3. On systems with Bose either bypass the amplifier (by re-soldering the wires), or use line output (RCA) for connecting to an external amplifier.

Critically important: in systems with Bose the voltage at the amplifier outputs can reach 40V, which will lead to failure of the standard radio. Always check the voltage before connecting!

💡

If after replacing the radio, the sound becomes quieter or interference appears, check the equalizer settings in the new radio. Often the cause is an incorrectly configured input level (gain) or activated high pass filter (HPF).

Connecting a rear view camera and parking sensors

B Nissan X-Trail T31 The standard rear view camera is connected via a connector OEM (contact 18 - video input, 19 — reverse control). To connect a universal camera you will need:

  1. Find the purple/black wire (Reverse) in the radio harness - it is activated when reverse gear is engaged.
  2. Connect the video input of the camera to a contact RCA on the radio (usually a yellow connector).
  3. Set the option in the radio menu Camera Input (some models require activation through the service menu).

For parking sensors, the situation is more complicated: as standard, they are connected to the unit BCM, and their integration with a non-standard radio is only possible through additional modules (for example, Viseeon VC01). An alternative option is to use universal parking sensors with a separate display.

💡

If after connecting the camera the image is mirrored, check the radio settings. In most cases, the problem is solved by activating the option Mirror Image in the camera menu.

Common mistakes when replacing a radio and how to avoid them

Even experienced car owners make mistakes when replacing the radio in X-Trail T31. Here are the most common ones:

  • ⚡ Short circuit due to incorrect connection BATT And ACC. Always check the voltage with a multimeter before making final connections.
  • 🔇 No sound in systems with Bose — they forget to bypass the amplifier or connect the speakers incorrectly.
  • 🚗 Error Audio Error on the dashboard — occurs in the absence of emulation CAN buses.
  • 🔌 Not working buttons on the steering wheel - requires an adapter with support SW-CAN (For example, Pac SWI-RC).

To avoid problems, follow this algorithm:

  1. Take a photo of the original pinout before disconnecting the old radio.
  2. Use fuses on line BATT And ACC (recommended denomination - 10A).
  3. Check speaker polarity to final assembly - incorrect connection can lead to their failure.
⚠️ Attention: If after replacing the radio the steering column switches stop working, do not try to reflash the unit BCM on your own. This may lead to the immobilizer being blocked. Contact a specialist with a diagnostic scanner Consult-III.

FAQ: Frequently asked questions about radio pinout Nissan X-Trail T31

Is it possible to connect a radio with Android Auto without losing steering control?

Yes, but you will need an adapter that supports CAN buses (For example, Connects2 CTNI001 or Pac RP4-NIS01). These adapters emulate the original radio and allow you to maintain the functionality of the buttons on the steering wheel. Without an adapter, the buttons will not work.

Why does the standard amplifier not work after replacing the radio? Bose?

Standard amplifier Bose in X-Trail T31 activated by a signal from the original radio. When connecting a universal head unit, the amplifier does not receive a control signal and turns off. Solutions:

  1. Use an adapter with signal emulation (for example, Nissan Bose Adapter).
  2. Connect the speakers directly to the radio, bypassing the amplifier (resoldering of the wires will be required).
  3. Install an external amplifier and connect it via RCA-outputs.
Which fuse controls the radio in X-Trail T31?

In the fuse box (located under the steering wheel, on the left) the fuse is responsible for powering the radio F30 (10A) in the cabin. Also check the fuse F10 (15A) in the engine compartment - it is responsible for ACC. If the fuses blow after replacing the radio, look for a short circuit in the wires.

Is it possible to connect a rear view camera to the standard radio without navigation?

No, standard radios X-Trail T31 without navigation (CD/MP3) do not have video input. To connect the camera, you will need to replace the radio with a model with RCA-input or use of a separate monitor.

Why does the climate control not work after connecting a new radio?

In some trim levels X-Trail T31 climate control is controlled via CAN bus, and when the original radio is turned off, communication with the unit may be lost HVAC. The solution is to use an adapter that supports CAN or connect climate control directly to BCM, bypassing the radio.