Volvo DDM 30658116 Cleaning Procedure

DDM 30658116 Cleaning Procedure
Introduction
The Drivers Door Module (DDM) Part number 30658116 is used to control the power
windows, Door locks and mirrors. The DDM consists of the button panel on top, which
includes and upper circuit board assembly, and the lower casing which houses the lower
circuit board assembly and connectors.
The DMM does not have mechanical contacts as have been used on earlier versions of
this switch assembly, instead the upper circuit board has integral force sensors that are
activated through a rubber mat which has raised portions on it that act like springs to push
on the force sensors when the buttons are activated.
The rubber mat has a series of holes in it that allow the light from the Light Emitting
Diodes (LED) on the circuit board to shine through and illuminate the buttons. These
holes expose a number of sections of the circuit board and allow dust and dirt to
accumulate over time. I found that this dust and dirt is able to get between the mat and
the circuit board.
The dust and dirt contamination has two effects the first is because the force sensors are
extremely sensitive any particles between the mat and the circuit board will affect what
portion of the sensor is pushed on this can lead to intermittent operation. The second is
that the particles will act like sand paper and over time could wear through the protective
coating on the circuit card causing a permanent failure of the sensor.
This procedure is guide to removing the rubber mat and cleaning any accumulated dust
and dirt.
The upper and lower sections of the DDM are held together externally by 8 latch points
and internally the two circuit boards are connected by a ribbon cable. Disassembly and
reassembly of the DDM is quite simple.