Volkswagen Golf Quiz
Electrical system

Removing and installing trailer detector control unit -J345-

In this manual: Electrical system
General body repairs, exterior — 230General body repairs, interior — 279General information, paint — 133Vechile- specific paint information — 27Heating, air conditioning — 156Auxiliary heater — 58Air conditioning system with refrigerant R134a — 1297- speed dual clutch gearbox 0CW — 544- cylinder injection engine(1.4 1 direct inction. turbocharger) — 182Fuel supply system - Petrol engines — 59Running gear, axles, steering — 221Brake system — 92Wheels and Tyres guide — 12Guide for using trailers — 11Wheels and Tyres Guide - General Information — 121Brake system (hybrid) — 73Electrical system — 326Communication — 65Electrical system, general information — 111
~1min read
Note When renewing the control unit, select Renew function for the respective control unit in Guided fault finding or Guided functions mode → Vehicle diagnostic tester.

Removing

  • Switch off ignition and all electrical consumers.
  • If ignition key is present, disengage in position 0 (locked).
  • Remove luggage compartment side trim (left-side) → General body repairs, interior; Rep. gr.70.
  • Press retaining clips -1- together in direction of arrow -A-.
  • Remove trailer detector control unit -J345--3-.
  • Disconnect connectors -2-.

Installing

Install in the reverse order of removal, observing the following:

Note Following installation, a new trailer detector control unit -J345- must be encoded → Anchor.

Coding trailer detector control unit

  • Connect vehicle diagnostic tester.
  • Code trailer detector control unit → Vehicle diagnostic tester.
Removing and installing trailer detector control unit -J345-

Test yourself

A quick Volkswagen Golf quiz: every answer comes with an explanation and a link to the manual page.