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Stationary heater control module summary
1 STH control module
2 Blower actuation wiring strand
(black/red, black/violet and black wires)
3 Line rt/ws (red/white) (+ c. 30)
4 Lead for circulation pump actuation
(brown and black/white line)
5 Timer wiring strand
(red, yellow and brown wires)
6 Heater adapter cable
Attach cables and wiring strands to existing cables and wiring strands using cable straps when routing. Avoid chafing points, if necessary install chafe guard. Cut off or tie back excess wires and leads.
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1 Open cable duct (arrow) in left front wall and
lay blower actuation wiring strand (2) with black/red, black/violet and black wires,
Line (red/white) (3),
Lead for actuation of circulation pump (4) with the brown and black/white lines
and
timer wiring strand (5) with red, yellow and brown wires
in the interior via the cable duct.
2 Lay heater adapter cable (6) behind battery down to left side rail.
3 Insulate lead for actuation of blower (2) with the black/red, black/violet and black and red/white line (3) and tie back under the instrument panel.
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4 Route lead for actuation of circulation pump (4) with the brown and black/white lines under the instrument panel to the installation location of the air conditioning control and operating unit.
5 Insulate and tie back the brown line (7) of the lead for the actuation of the circulation pump (4).
6 Detach 21-pin plug (8) from the air conditioning control and operating unit that has been removed.
7 Attach plug contact to the black/white line (9) of the lead for actuation of the circulation pump (4) and insert line in chamber 4 of the 21-pin plug.
8 Reconnect plug to air conditioning control and operating module.
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9 Attach 4-pin connector (20) to timer wiring strand coming from control module and plug housing (21) to timer (23) wiring strand (22):
Attach receptacles and plug connections to the wires.
Insert wires into connector and connector housing in accordance with timer connection pin assignments.
Timer connection pin assignments
Plug-in position Wire
1 rt (red) (+ c. 30)
2 ge (yellow) (control line for timer/water heater)
3 br (brown) ()
4 bl (remote control, Option)
The graphic shows the line entry side of the plug and plug housing. Plug-in position 4 remains free and is intended for connecting the remote control option.
10 Attach the connector to the plug housing and make connections to existing cables and wiring strands beneath instrument panel.
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11 Cut off heater booster (25) standard connector and fit heater adapter cable (6).
For better clarity the diagram shows the arrangement of the standard connector with the left-hand lamp unit removed.