Lumbar Support BMW 3 Series E36

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BMW Installation Instructions

Lumbar Support BMW 3 Series E36

Technical knowledge is required.

Installation Time: approx. 2 hours, depending on the condition and level of equipment of the vehicle.

The installation of the lumbar support is described for the left-hand seat. For the right-hand seat, the installation is in the same order, but mirror-inverted.

Tools and Materials Required

Torx screwdriver
Side-cutting pliers
Universal knife
Ratchet with 1/2” drive 1/2″ extension
1/2” drive socket E 16 mm, 10 mm
Torque wrench
1/2” torx drive socket
Phillips screwdriver
Screwdriver for slotted screws
Pliers

Contents

Chapter

  1. Necessary Preliminary Tasks
  2. Installing the Lumbar Support
  3. Installing the Seat Wiring Plarness
  4. Installing the Actuating Switch
  5. Laying the Power Supply Cable (only models without pre-wiring)

1. Necessary Preliminary Tasks

  1. Print out fault memory
  2. Disconnect battery/batteries
  3. Remove head restraints
  4. Remove front seats
  5. Disconnect front seat belts

Overview of Seat Wiring Harness

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Pos. Type/Description Wire Colour Connection in car Connection

point

a 4-pin white pin housing socket housing underneath seat X275
b 4-pin black socket housing actuating switch at seat X652
c 4-pin white socket housing Br, Wh/Rd, Br, Wh/BI lumbar support motor pump unit X18135
d 4-pin white socket housing Rd/Ye, Br plug housing for electric seat adjustment

Overview of Power Supply

Left-hand seat Right-hand seat

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Pos. Type/Description Wire Colour Connection in car Connection

point

a Crimp contact Rd fan connector in distribution box X1073
l_b Flat socket Rd fuse carrier in distribution box, left-hand seat X10015
c Flat socket Rd/Ye fuse carrier in distribution box, left-hand seat X10015
d 4-pin white socket housing pin housing underneath the left-hand seat X275B
e Cable lug Br earth terminal on left of instrument panel X173
f Flat socket Rd fuse carrier in distribution box, right-hand seat X10018
g Flat socket Rd/Black fuse carrier in distribution box, right-hand seat pin housing underneath the right-hand seat XI0018 X279
h 4-pin white socket housing

2. Installing the Lumbar Support

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Lumbar Support BMW 3 Series E36

Pull out the head restraint (1) in the direction indicated by the arrow. Remove the levers (3), unclip the covers (2) and remove the torx screws (4). Remove cover (5).

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Lumbar Support BMW 3 Series E36

Remove the clips (1) from the backrest.

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Lumbar Support BMW 3 Series E36

Insert the lumbar cushion (1) into the backrest in the direction indicated by the arrow. Position the fastening loops (2) as in the illustration.

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Lumbar Support BMW 3 Series E36

Connect the hose (2) to the angle bracket (1). Secure the pump (3) with the cable strap (4).

3. Installing the Seat Wiring Harness

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Lumbar Support BMW 3 Series E36

Cut off the split pins (1) underneath the seat. Lever out the seat cushion (2).

Note on Installation

Use new split pins.

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Lumbar Support BMW 3 Series E36

Sports seats only

Remove the torx screws (1). Swivel the backrest (2) in the direction indicated by the arrow.

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Lumbar Support BMW 3 Series E36

Secure the connector holder (1). Move the socket housing (C) of the seat wiring harness (2) to the backrest. Move the socket housing (B) to the installation point of the actuating switch. Insert the pin housing (A) into the connector holder (1).

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Lumbar Support BMW 3 Series E36

Connect the socket housing (C) of the seat wiring harness to the pin housing (1) of the pump and secure it with the cable strap (2).

4. Installing the Actuating Switch

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Lumbar Support BMW 3 Series E36

Remove the cover (1) in the left-hand seat panel (2) in the direction indicated by the arrow.

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Lumbar Support BMW 3 Series E36

Insert the actuating switch (1) in the side panel (2). Attach socket housing b form the seat wiring harness to the actuating switch (1). Secure the seat wiring harness to the underside of the seat without any kinks or twists by means of cable straps.

5. Laying the Power Supply Cable

Only models without pre-wiring

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Remove the cover flap (2).

Remove the Phillips screws (1).

Pull off the panelling (3) in the direction indicated by the arrow and remove it.

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Lumbar Support BMW 3 Series E36

Right or left-hand side of car

Lever off the cover strip (7).

Remove the edge guard (1) in the direction indicated by the arrow.

Left-hand side of car

Lever off the cover (2).

Remove the Phillips screw (3).

Pull off the lever (4).

Right or left-hand side of car

Unlock the plastic screw (5) by turning it 90°. Remove the side panelling (6).

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Lumbar Support BMW 3 Series E36

Remove the Phillips screws (1).

Pull off and remove the panelling (2) in the direction indicated by the arrow.

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Lumbar Support BMW 3 Series E36

Unscrew the hexagon nuts (1).

Disassemble the front wiring harness sheathing (2).

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Lumbar Support BMW 3 Series E36

Left-hand side of car

Remove the hexagon plate screws (1).

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Lumbar Support BMW 3 Series E36

Take of the lid of the distribution box (2), loosen the Torx screws (1) and fold the distribution box (2) upwards.

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Lumbar Support BMW 3 Series E36

Remove the car wiring harness guide (1) in the direction indicated by the arrow.

Note on Installation

To prevent moisture from entering the car interior, it is important to ensure that the guide (1) is correctly inserted into the distribution box.

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Lumbar Support BMW 3 Series E36

Remove the fuse carrier (2) in the direction indicated by the arrow.

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Lumbar Support BMW 3 Series E36

Remove the locking slide (1) of the fuse carrier (2) in the direction indicated by the arrow.

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Lumbar Support BMW 3 Series E36

Note

Insert the power supply cable from the car interior in the distribution box.

Insert the connection (b, c, f, g) in the distribution box as follows:

Left-hand Seat Power Supply

Insert flat socket (b) – wire colour: red – into plug-in station 19 and insert flat socket (c) – wire colour: red/yellow – into plug-in station 20. Fit the fuse carrier. Insert a 30 A safety fuse into plug-in station F40 on the fuse carrier (1).

Right-hand Seat Power Supply

Insert flat socket (f) – wire colour: red – into plug-in station 9 and insert flat socket (g) – wire colour: red/yellow – into plug-in station 10.

Insert a 30 A safety fuse into plug-in station F5 on the fuse carrier (1).

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Lumbar Support BMW 3 Series E36

Power Supply on Left and Right

Insert the crimp contact (a) – wire colour: red – into the fan connector X1073

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Lumbar Support BMW 3 Series E36

Unscrew the hexagon nut (1). Attach the cable lug (e) – cable colour: brown – to the earth support on the left below the instrument panel.

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Lumbar Support BMW 3 Series E36

Move the two power supply (1) socket housings (d, h) along the main wiring harness to the left and right of the seats and connect them with pin housing a to the seat wiring harness.

All Models

Reinstall all removed parts in reverse order.

Connect the socket housings (d, h) of the existing power supply to the pin housing a of the seat wiring harness.

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