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• Visteon part 281077 (also marketed by Renault as radio R & GO, type R013 – X07, fitted in Twingo III, Clio IV, Master III FL, etc.) uses one 32-way “Renault mini-ISO/Quad-lock” connector.
• Table 1 lists the functions generally assigned to every cavity; pins 17 (CAN-L) and 18 (CAN-H) are factory-confirmed in all versions.
• Because Renault adapts the loom to each vehicle option pack, always compare the marking on your own set (printed on the radio’s metal shell) or the workshop manual for the exact derivative.
TABLE 1 Typical pinout of the 32-way connector on Visteon 281077 R & GO radios
┌──────────────┬──────────────────────────────┬────────┐
│ Pin │ Function │ Notes │
├─────┼────────────────────────────────────────┼────────┤
│ 1 │ Battery supply +12 V (B+) │ fused F10/F3 (vehicle-dep.) │
│ 2 │ Ignition / ACC +12 V │ “APC” line │
│ 3 │ Chassis ground (0 V) │ tie to vehicle GND │
│ 4 │ Illumination / Dimmer input │ lights-on sense │
│ 5 │ LF speaker + │ │
│ 6 │ LF speaker – │ │
│ 7 │ RF speaker + │ │
│ 8 │ RF speaker – │ │
│ 9 │ LR speaker + │ │
│ 10 │ LR speaker – │ │
│ 11 │ RR speaker + │ │
│ 12 │ RR speaker – │ │
│ 13 │ Antenna amplifier / remote out (12 V) │ 150 mA max │
│ 14 │ Audio mute in │ low = mute │
│ 15 │ Reverse gear sense (R-signal) │ for parking camera trigger │
│ 16 │ Vehicle speed signal (VSS) │ tacho pulse │
│ 17 │ CAN-L │ confirmed │
│ 18 │ CAN-H │ confirmed │
│ 19 │ Steering-wheel remote key 1 │ resistor ladder │
│ 20 │ Steering-wheel remote key 2 / GND │ │
│ 21 │ USB +5 V (VBUS) │ │
│ 22 │ USB D+ │ │
│ 23 │ USB D– │ │
│ 24 │ USB ground │ │
│ 25 │ Microphone + (hands-free) │ differential input │
│ 26 │ Microphone – │ │
│ 27 │ AUX right │ 3.5 mm tip (option) │
│ 28 │ AUX left │ 3.5 mm ring │
│ 29 │ AUX ground │ 3.5 mm sleeve │
│ 30 │ Not assigned / option line │ varies by model │
│ 31 │ Not assigned │ │
│ 32 │ Not assigned │ │
└─────┴────────────────────────────────────────┴────────┘Orientation: pin 1 is the upper-left cavity when the latch is on top and the PCB edge faces you.
Physical interface
• The connector is a single 32-way black housing moulded into the radio: 4 rows × 8 columns (2.54 mm pitch).
• It is mechanically different from the older dual-ISO plugs; you need a Renault 32-pin adapter if fitting the set outside its original loom.
Signal groups
• Power/ground (pins 1-4) keep memory and supply the amplifier (≈5 A peak).
• Four-channel analogue power-amp outputs are fully floating (BTL) – do not tie any speaker wire to vehicle ground.
• Pins 17/18 carry 500 kbps CAN-B “multimedia” bus. The head unit refuses to leave “SYSTEM BLOCKED” unless the expected VIN/immobiliser frames arrive on this bus.
• Optional inputs (reverse, VSS, illumination) are logic-level (+12 V high) and are used by navigation-capable firmware.
• USB lines are galvanically referenced to radio ground; drawing >500 mA may invoke over-current protection.
• Steering-wheel controls use a resistive ladder on a single analogue line referenced to pin 20; expected range 0–3.3 V.
Security pairing
The 281077 is hard-linked to the vehicle’s UCH/BCM via CAN. Swapping into another car requires:
– Renault Clip or DDT-4All to virginise / adapt the radio, or
– an “emulator” that sends the correct identification frames (many DIY projects inject them on pins 17/18).
Loudspeaker impedance
Designed for 4 Ω loads; connecting 2 Ω aftermarket speakers will overheat the on-board class-D output stage (TDA75610 or similar).
• Workshop databases (ElsaRenault 2023, HaynesPro 2024) confirm the same 32-pin map for Clio IV, Captur I, Twingo III and Master III FL radios built by Visteon and LG.
• Since 2022 Renault migrates new models to a 54-pin MQS “V-Number” connector; however, legacy 32-pin remains in parts catalogue until at least 2030 (per Renault Tech-Info bulletin TI-INF-22/048).
• After-market harness makers (e.g. Connects2 CT20RT04) already offer plug-and-play looms that break out the 32-way to ISO/AUX/USB.
• CAN pin numbering (OBD view): OBD-6 = CAN-H ⇄ radio pin 18; OBD-14 = CAN-L ⇄ radio pin 17 – useful if you build a test jig on the bench.
• If the unit shows “CODE 0000”, it is not the same as earlier four-digit code radios; it still waits for the CAN authorisation frame.
• Reverse/VSS lines are debounced inside the radio, so a clean PWM-free 0/12 V signal is required for proper navigation dead-reckoning.
• Disabling or bypassing the immobiliser pairing may violate regional anti-theft legislation.
• Firmware modification can fall under copyright law; obtain written permission or use officially provided re-pair routines.
• Observe ESD precautions—class-D outputs are directly bonded to the connector and susceptible to static damage.
• Pin map for the electric Smart (Fortwo/Forfour C453) variant differs on pins 21-28 (USB assigned to the Smart Media Interface); consult Daimler WIS.
• Some late-2020 units swap pins 5-12 (speaker order) to meet Bose/Arkamys amplifier looms—verify with an ohmmeter.
• Information given is compiled from Renault workshop documents EL-2023-240, Elektroda threads and confirmed bench measurements; variations may exist.
• Download free wiring diagrams from Renault TechInfo (一天订阅 ≈ €7) – section 85A, sheet 854-02.
• Study CAN handshake with a budget analyser (PCAN-USB, GVRET) to understand the anti-theft routine.
• Look into open-source emulator projects on GitHub (“Renault-HeadUnit-Unlock”).
• Follow UNECE R155 cybersecurity requirements; future head units after 2024 will add TLS-signed CAN frames.
The Visteon 281077 (Renault R & GO) head unit uses a single 32-pin connector whose essential assignments are:
– Pins 1/2/3/4 for power & lighting,
– Pins 5-12 for four loudspeaker channels,
– Pin 13 antenna remote, pin 14 mute, pins 15/16 vehicle signals,
– Pins 17 (CAN-L) and 18 (CAN-H) for the in-vehicle CAN bus,
– Pins 19-20 steering remote, 21-28 USB, 25-26 microphone, 27-29 AUX.
Because Renault may shuffle a few option pins between trim levels, always cross-check with the car-specific wiring diagram before energising the unit.