Renault Master immobiliser bypass problems: MK2 2003-2008
This UCH / Body system control unit / BSI controls the immobiliser + it has many other functions like, central locking, hazards, windscreen wipers + many more.
The UCH control unit suffers from general failure or very common water damage.
Look to the left-hand side of the steering column, you will see the control box as shown below.
Look at the circuit board, if you see any damp / corrosion this is the problem. Some times just the black connector may just be suffering from a dry joint. Un-plugging and re-pugging in the black connector can re seat the connections.
PLEASE don’t use WD40 use a brake cleaner or a proper electrical spray.
If the UCH unit is corroded this will need replacing, a replacement UCH unit is about £130.
PLEASE order the part from a Renault dealer as they are cheaper than a Vauxhall dealer. The part is a Renault part, the UCH needs programming, we can carry out the programming.
What we need:
We need the original UCH unit and a replacement. We do not supply replacement units as they are only obtainable brand new from a main dealer. We can use second-hand units, we copy the data information from the original unit to a replacement unit so it is a 1 to 1 copy / clone so the replacement unit will be ready to fit.
CAN (central area network)
The UCH is the main CAN control see https://www.csselectronics.com/pages/can-bus-simple-intro-tutorial
If your Renault Master / Vauxhall Movano red LED immobiliser light is on:
- solid /
- not flashing /
- staying on constantly the CAN has a fault. So the immobiliser is fine it works BUT it has lost a connection with the electrical CAN system on your Vivaro. This cannot be repaired by the bypass as the fault is usually a corroded / broken wire.