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Stationary heater control module summary
1 STH control module
2 Blower actuation wiring strand
(wire colors black/red, black/violet and black)
3 Line rt/ws (red/white) (+ c. 30)
4 Wiring harness for recirculation pump actuation
(line colors brown, black/white (br, sw/ws)
5 Timer wiring strand
(wire colors red, yellow and brown)
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 Route timer wiring harness (5) with red, yellow and brown (rt, ge and br) leads and recirculation pump control wiring harness (4) with black/white and brown (sw/ws and br) leads out of driver-side seat frame and below floor covering to driver-side wheelhouse
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2 Disconnect blower control wiring harness (2) and red/white (rt/ws) lead (3) and insulate remaining lead control module.
The blower actuation wiring strand is marked with a blower symbol on the control module housing.
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3 Fit pin sockets to circulation pump (4) wiring strand wires and insert wires into a 2-pin plug (9).
4 Make extension wire for black/white wire from driver's side wheelhouse to air conditioning pushbutton control module installation location.
5 Attach plug connection to extension wire (7) and insert into plug housing (8).
When inserting the extension wire, ensure that the plug connection is positioned opposite the black/white wire pin socket. The brown wire (11) is inoperative and terminates in the plug (9).
6 Attach plug to plug housing and route extension wire below instrument panel to installation location of A/C pushbutton control module.
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7 Remove 21-pin connector (12) from AC pushbutton control module.
8 Attach plug connection to extension wire of black/white wire (7) and insert wire into chamber 4 of 21-pin plug.
9 Reconnect 21-pin connector to air conditioning pushbutton control module.
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10 Route timer wiring (22) strand (19) to entrance via driver's side wheelhouse.
11 Attach 4-pin connector (21) to timer wiring strand coming from control module and connector housing (20) to timer (19) wiring strand:
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) (timer/water heater control line)
3 br (brown) ()
4 bl (blue) (remote control, optional)
The illustration shows the lead inlet side of the connector and the connector housing. Plug-in position 4 remains free and is intended for connecting the remote control option.
12 Attach connector to connector housing and attach connector to existing wires or wiring strands in wheel arch area together with blower connector.
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13 Cut off heater booster (18) standard connector and fit heater adapter cable (6).