Webasto CARBONTECH Quick start guide

Presents
CARBONTECH™ Seat Heater
INSTALLATION INSTRUCTIONS
AND
OWNER’S MANUAL
SINGLE SEAT APPLICATION
With two 12” x 26” Heating Pads
(HI/LO/OFF Round illuminated Switch)
P/N 300202-MWA

Page 3 of 20
Installation Preparation & General Notes:
1. Seat heater system will NOT work on seats manufactured using the “foam in place” (trim
cover glued to foam pad) method of trim cover attachment.
2. If the vehicle is equipped with an anti-theft radio, the radio code must be written down prior
to disconnecting battery cable. The code must be re-entered when the negative battery
cable is re-installed.
3. If vehicle is equipped with an air bag, it is advisable to disconnect negative battery cable for
3 minutes prior to beginning installation.
4. Only use parts and components supplied in kit for the seat heater installation. The supplied
components are carefully selected for optimal performance. Foreign parts may lead to problems
which could result in potential damage to the seat heater components or vehicle.
5. The installation of the heating pads must be free of creases and wrinkles.
6. Seats in vehicles with pre-loaded (power charge equipped) safety belts must be removed and
re-installed under strict adherence to the vehicle manufacturers instructions.
7. In cases where a seat is equipped with an occupant pressure sensor for air bag deployment;
please refer to the manufacturer’s manual for any specific instruction with regard to installing
seat heater kits.
8. After installing seat heater wire harness, care must be taken to ensure all seat motions are still
possible without obstruction and the moving of the seat does not cause any interference that
could damage the seat heater wire harness.
9. Installation of a CARBONTECH™ seat heater system with seats containing seam lines
running front to rear (length wise) is not permitted. Only exception is if the heating pads are
not directly located over the groove/s.
10. The overall side to side (width) of the heating pads must not be altered (cutting not
permitted).
11. Both heating pads must be connected to ensure system functions properly.
Warning: Metal, electrical conductors or hog rings are not to be placed on, through or
across the heating element.
Warning: Do not tap or solder seat heater harness to any airbag circuits. Yellow tape,
tubing and connectors will indicate airbag circuits.
Warning: Do not tap or solder seat heater harness to any pre-loaded safety belt circuits.

Page 4 of 20
Installation:
Open box and remove contents. Check to make sure that the following parts are
included within kit:
Qty Description Part Number
2 12”x 26” Seat Heater Pad 30-0108-MW
1 Wire Harness Assembly 30-4200004
1 Switch Assembly 30-0213-MW
4 Black Tape Strips 30-0110-MW
4 Gold Tape Strips 30-0109-MW
1 Red T-Tap Connector 88-2300003
1 Blue T-Tap Connector 88-167000-TT
1 Yellow T-Tap Connector 88-2300002
2 Male Spade Connector 88-167000-MS
10 Wire Ties 88-8880001
Seat Cushion:
1. Prior to removing seat from vehicle, lay heating pads on seat to verify size & fit.
2. Secure car on a level surface.
3. Disconnect the negative battery cable or make sure that the area to be worked within is
grounded. If you have any doubt concerning the layout of the vehicle wire harness, consult
the wiring diagram provided by the manufacturer.
4. Remove seat from vehicle and place on a suitable work table/area.
Note: Make certain to disconnect all wire connectors prior to removing seat from
vehicle.
5. Disassemble seat as needed to gain access to seat cushion cover attachment clips.
6. Unsnap j-clips and or remove
“hog ring” clips and peel
back cover. See Fig 1 & 2
Fig 1
Fig 2 Note: If trim cover has hook and loop
style tie down, care must be taken
when removin
g
cover.

Page 5 of 20
7. Measure the width of the center seat area between the
longitudinal seams.
Note: The width must be at least 250 mm (10 in).
The heating pad CANNOT contact the side seams of the
seat. If it does make contact, the seat heater cannot be
installed. See Fig 3
8. Position the heating pad with the label facing down and the wire harness routed towards the
back of the seat area. Adjust the pad so the thermostat is located approx. 25-50 mm (1-2
in) forward of the back rest. In cases where the seat cushion contains lateral grooves (side
to side) to allow for trim cover attachment, a section of the heating pad will need to be cut
out. See Fig 4
9. Once the area that needs to be cut out is marked, remove the heating pad from the cushion.
Measure in board (towards Center of pad) on each side
40mm (9/16 in) and mark. This is necessary to ensure
that the main power supply for the heating pad does
not get damaged or cut. See Fig 5
10. Cut out the marked area. With the section removed, wrap lateral "bridges" with the supplied
black insulation tape. Repeat procedure on remaining sides of cut out. See Fig 6
Fig 3
Fig 4
Fig 6
Fig 5

Page 6 of 20
11. Reposition heating pad onto cushion foam. Make sure thermostat is in the correct location.
(see step 9) Using the supplied gold double sided tape, attach the back edge of the heating pad
to the cushion foam. With the pad attached at the rear, determine the final length.
Note: Make sure that the length difference between the cushion pad and back rest pad is not
more than 275 mm (10-3/4 in). See Fig 7
12. Trim if needed and attach using the supplied gold double sided tape.
Note: Seat heater pad should reach the forward edge of the seat cushion. See Fig 8
13. Route the heating pad wire harness so that it exits the trim cover in an inconspicuous area.
14. Installation is now complete. Double check to make sure the pad does not have any
wrinkles or is folded over onto itself. Once checked, carefully re-attach trim cover.
Back Rest:
1. Follow the same order and procedures for steps 5-13 for installing the heating pad to the
back rest.
Note: For step 11, use 2 pieces of gold double sided tape. One at the top and the other
approximately half way down to ensure the pad will not loosen and wrinkle over
time due to effects of gravity.
Fig 7
Fig 8

Page 7 of 20
Seat Heater Pad Wire Harness Routing/Attachment:
1. Route wires from cushion & back to underside of seat. Use supplied wire ties to fasten
harness to seat.
Warning: Make sure attachment locations will NOT interfere with any seat movement.
Seat Heater Switch:
1. With the seat still removed from vehicle, choose a switch location on a flat surface where the
wires won’t interfere with any seat movement.
2. Mark the location and drill a 19.5 mm (3/4 in) hole using a stepped drill bit.
Note: hand filing may be required for final fitment.
3. Insert switch through opening and snap into place.
Seat Heater Wire Harness:
1. Remove vehicle scuff plate & kick panel.
2. Start under seat, route main harness through carpet opening toward scuff plate. Route
harness along scuff plate towards the underside of dash.
Note: If opening in carpet does not exist, create as required.
3. Using a digital volt/ohm meter, locate a switched ignition circuit that is capable of handling a
10A continuous current and attach using one of the supplied T-tap connectors. Use Red T-
tap for 18-22 gauge wire, blue T-tap for 16-14 gauge wire or yellow T-tap for 12-10 gauge
wire. Attach spade connector to seat heater harness red wire and connect to t-tap. Note:
Improper installation could drain your battery if you attach seat heater harness to a
constant battery source.
Warning: Never use engine control/ECM, safety device, ABS/ARS or engine cooling fan,
etc. to power the seat heater circuit.
4. Attach ring connector on the black harness wire to a suitable ground source at vehicle.
Note: A T-tap and spade connector can also be used if needed.
Note: Tap/splice into only one vehicle circuit per seat heater harness.
Final Seat Assembly:
1. Re-assemble remaining components of seat.
2. Load seat into vehicle. Do not install mounting fasteners.
3. Re-connect vehicle harness connectors. Connect seat heater switch, main power and
heating elements to seat heater harness.
Note: Heating elements can be plugged into either connector.

Page 8 of 20
4. Install seat mounting fasteners and torque to manufacturers recommended specifications.
5. Re-connect the negative battery cable and test function the seat heater system.
6. Re-check all systems and accessories where components were removed or relocated during
the installation process.
7. Re-install vehicle scuff plate and kick panel.

Page 9 of 20
Troubleshooting:
If system does not heat up or no indication of power.
-Check fuse in seat heater harness and vehicle.
-Temperature of seat may be above the preset thermostat temperature and will not allow
it to come on. (i.e.: sun shining on seat)
-If the light on the heated seat switch does not come on, it could be that the switch bulb is
burnt out (replace switch) or that there is no power to the switch.
-Ensure that all connectors are properly connected and that the ground wire is properly
grounded. (see Fig 9 for wiring diagram)
-Using a digital ohm meter, test only the heating elements (switch not included) from the
under seat wire connector. If no resistance is found, then an open condition exists.
-Check internal wire connectors for an open circuit. If a heating element has an open,
install a new heating element.
-If the heating elements and seat harness tests OK, then a power supply problem exists.
-Using a digital volt meter, start at the source and trace back through all the connectors
and switch to determine where the power loss is occurring. Repair as necessary.
-If the seat heater fuse continues to blow, then a short or bad ground condition exists in
the power circuit.
-If the vehicle fuse which has the heated seat T-tap connected to it continues to blow,
then the tap will need to be moved to another vehicle circuit.

Page 10 of 20
Seat Heater System Wiring Schematic:
CARBONTECH™ Seat Heater Specification (290mm)
Heater Pads:
Size 645 x 290mm
Thickness 1.3mm
Heating Power 0.050 Watt/sq. cm @ 13.8 Volts
Total Heating Power 71 Watts @ 13.8 Volts
Electrical Resistance 2.67 Ohm +/- 10%
Electrical Current 5.17 Amps @ 13.8 Volts
Thermostat Bi-Metal switch: on at 40°C, cuts off
at 70°C
Wire Length 520mm +/- 10mm
Connector Tyco/AMP
Burn Rate <80mm/min. to FMVSS 302
Specification 2000/53/EG
Weight 0.094 kg
Content per Kit 2
Note: All data are valid for the non-trimmed heater pad.
Heater Element
Cushion Heater Element Back Res
t
Connectors
2-Pin / White
Relay
Connector
4-Pin / White
Switch
Ground
10A Fuse
Switched Ignition
Source
Fig 9