Procedure D - For All Seats
1. Fold door side backrest cover forwards and mark front foam pad (1) at the center of the head restraint holes and at a distance equal to dimension A6 from the edge.
A6: approximately 30 mm.
Note: Passenger seat shown for this repair procedure.
2. Mark (2) the rear side of the foam pad at a distance equal to dimension A7 from the edge of the lower molding contour (1) on the back of the foam pad and mark (2) at a distance equal to dimension A6 from the door side edge.
A6: approximately 40 mm.
A7: approximately 30 mm.
Note: View is shown while sitting in the back seat.
3. Push welding rod (1.5 - 2.5 sq.mm) (1) up through the two markings from the rear side of the foam pad (2).
4. Bend upper section of welding rod (1) into a small loop and fasten the wire (2) to it. Pull the wire and welding rod through the foam pad blue end first. Note: Route the blue wire loosely to the front of the foam pad.
5. Reassemble the lower half of the seat cover onto the foam backrest using new round latch clips.
6. Affix long felt adhesive strip (500 mm x 40 mm) (1) to the outside edge in rear foam pad (above the line exit), secure blue wire to the center of long felt adhesive strip and route it downwards and towards the center of the seat (2).
Note: To avoid the risk of damage to the wire, affix the felt adhesive strip at a distance of at least 10 mm above the hole made in step 2.
7. Cut a shallow incision (1) approximately 1/3 of the way across the bottom of the foam pad to be able to route the blue wire. Push the wire into the incision.
8. Affix a short felt adhesive strip (300 x 40 mm) over the length of the blue wire.
9. Fold the foam pad and seat cover over the backrest frame, but do not secure. Check that the foam pad and seat cover are positioned correctly.
10. Cut open the backrest heating wiring harness sheathing approximately 100 mm from the connector.
11. Gently secure the blue wire to the backrest heating wiring harness using electrical tape.
12. Connect blue wire (1) to backrest heating wiring harness (3) using a snap connector (2).
Driver seat wire color: Brown
Passenger seat wire color: Black and yellow
Notes for correct installation:
^ Press the blue wire into the housing as far as the stop.
^ Close the cover half and press together using suitable pliers until there is definite engagement. During this closing operation, make sure that the blue wire remains pressed into the stop.
^ Route the other wire to be connected into the housing, close the cover half and press together using suitable pliers until there is definite engagement.
^ The lines make proper contact when both housing
halves are closed and engaged.
13. Wrap the blue wire and the wiring harness (1) with electrical tape up to the snap connector (2).
14. Connect the seat heater wiring harness (1) to the seat harness connector (2).
15. Insert the wiring connector's locking tab into the hole from the backside of the seat frame. Route wiring behind the backrest frame.
16. Carry out a function check. The ignition key must be turned to position 2 and the seat heating switched on for at least three minutes. The backrest must have heated up afier this time.
17. Completely reassemble the seat.
Note: Perform the following to avoid damage to the comers of the leather when reinstalling seat cover over the foam backrest on the 7 Series seats:
Pull up on the bottom of the seat cover to make more slack up top. Push down on the foam and flip the seat cover backwards onto the foam backrest. Then pull the seat cover and foam backrest together up and over the top of the metal backrest frame.
18. Repeat entire procedure on opposite front seat.