Installation kit – electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

EBA – 01 29 9 750 844
BMW Installation Instructions

There may be slight differences between the trailer couplings, depending on the manufacturer. Please refer to the manufacturer’s own fitting instructions.

All work is illustrated on a left-hand drive car. On right- hand drive cars, some work must be transfered to a corresponding position on the other side of the car’s center- line.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Take out the luggage compartment floor carpet, the bulkhead wall trim and the left and right luggage compartment trims.

Pull out the clips holding the tail panel trim, and detach the trim.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Unscrew the nuts at left und right, and take off the corners of the trim panel.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Pull the rear trim panel away from its clips.

When installing: attach clips (previously removed) with the points upwards.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Remove the screws.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Pull the lock operating rod out of its clips.

Pull off the plug at the actuating motor.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Insert the reinforcement, align it centrally and move it up against the tail panel.

Mark out and drill eight 12 mm diameter holes (a) and six 10 mm diameter holes (b) on the tail panel to match the holes on the reinforcement. (Drill pilot holes with a 5 mm bit.) Deburr the holes and coat them with zinc powder paint.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Mark out and drill the hole for the wiring (drill a pilot hole and use a shell boring bit for the main hole).

C = 35 mm diameter

Deburr the hole and coat with zinc powder paint.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Align the reinforcing angles (3) in relation to the holes in the cross-member, and mark the positions of holes (c).

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Mark holes (d) at distance A = 204 mm from holes (c) at a right angle to the cross-member.

Drill holes (c) and (d); drill pilot holes first with a 5 mm bit. c = 12 mm dia. d = 11 mm dia.

Deburr the holes and coat with zinc powder paint. Remove metal swarf from the luggage compartment with a vacuum cleaner.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Insert the threaded plate (4) and tighten the reinforcing angles (3) hand-tight.

3 hex bolts, M 8 x 20 mm
3 washers.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Insert reinforcement (6) and screw in the hex bolts from the top.

Install the rear reinforcement in the same way (holes (a)). 12 hex bolts, M 10 x 25 mm / 8.8.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Unscrew the nuts.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Remove underseal from the body areas at which the trailer coupling is to be attached. Coat the bright metal areas with zinc powder paint.

Attach the trailer coupling provisionally.

12 self-locking nuts, M 10

12 washers, 10.5

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Bolt the reinforcement to the tail panel hand-tight.

  1. hex bolts, M 8 x 20 mm 4 washers, 8.5
  2. threaded plates (7)

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Bolt angles (8) at left and right hand-tight to the tail panel and reinforcement.

2 hex bolts, M 8 x 20 mm
2 washers, 8.5 x 24 x 2 mm

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Tighten all hex bolts finally.

Tightening torques:

M 10 = 43 … 48 Nm M 8 = 22 … 24 Nm Attach the exhaust expansion chamber.

Bolt strut (5) at left and right to reinforcement and luggage compartment lid hinge mounting.

Warning: note strength classifications.

4 hex bolts, M 10 x 35 mm = 10.9
4 hex nuts, M 10 = 10
8 washers.

Tightening torque 60 … 67 Nm.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Threaded connection A:

Note installed position of strut (5).

  1. = Hex bolt
  2. = Washer
  3. = Reinforcement
  4. = Angle
  5. = Strut
  6. = Self-locking nut

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Threaded connection B:

  1. = Hex bolt
  2. = Washer
  3. = Luggage compartment lid support
  4. = Spacing tube
  5. = Strut
  6. = Self-locking nut

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Electrical components to be attached:

Disconnect the earth (ground) cable at the battery.

Run the additional wiring harness through the hole and insert a rubber grommet (10).

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Detach multi-pin plug (1) from the control unit and connect with the socket (2) of the additional wiring harness. Attach multi-pin plug (3) of the additional wiring harness to the control unit.

Run the wiring to the rear lights; the cable for the left rear light has a white identification tape.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Unscrew the left and right rear light covers and detach the central plug.

Using a screwdriver, press over the locking plate in the central plug.

Pull out cable (1) and connect to the same colors of additional cable (2).

Insert the additional cable in the central plug.

Left rear light:

Plug coding                                   Cable color

(shown on casing)

I                                  gray/violet

III                                blue/red

IIIII                              brown

Right rear light:

I                                  blue/black

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Connect the central plug.

Pull rubber seal (1) on to socket.

Screw socket to holder, tapping thread if necessary.

Power supply to: Cable color Terminal number
Left turn Indicator blue/red 1/L
Rear fog light gray/violet 2/549
Earth (ground) brown 3/31
Right turn indicator blue/black 4/R
Right rear light and license plate light gray/white 5/58 R
Brake light green/red 6/54
Left rear light gray/yellow 7/58L

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Lift out the BMW emblem.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Unscrew nut (1) and remove together with washer (2). Mark steering wheel position in relation to steering column spindle.

When Installing: use a new self-locking nut.

Tightening torque 70 … 85 Nm.

Warning: do not damage the turn indicator lever canceling cams.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Remove the screws.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Detach the vacuum line (1) and plug (2) from the interior temperature sensor.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Lift out screen cover (1) with a small screwdriver.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Pull both bulb holders out of the carrier plate.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Loosen screws and take off the headlight beam throw control.

Detach the trim.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Take off the steering column surround.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Insert a bulb into the holder of the additional cable. Install the holder in the additional turn indicator repeater light base on the instrument carrier. (The instrument carrier has been removed to illustrate this work more clearly)-

Run the cable to the steering column.

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Screw on the brown earth (ground) cable (1).

Install the new flashing turn relay and attach the additional cable (2) (black/yellow).

Checking operation:

Connect the negative lead to the battery. Make quite sure that the connections in the plug are the same as the connections in the socket.

When a trailer is attached to the towing coupling, make sure that the trailer lights and flashing turn indicators work properly. The additional repeater light flashes only when a trailer is attached. Attach all components and trim previously removed.

Cut away the tail panel trim at the pre-formed areas. Trim the luggage compartment floor carpet at the corners until a snug fit is obtained.

Attach the nose-weight label.

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Electrical circuit diagram

Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

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Installation kit - electrical components for trailer coupling BMW 6 (E24) CS models (from 05.82-06.87)

Key to electrical circuit diagram

  1. = Cross-section, mm2
  2. = Basic color
  3. = Identification spiral
  4. = Compartment number
  5. = Terminal designation
  6. = Screws connection (cable shoe)
  7. = Round-pin plug
  8. = Round-pin socket
  9. = Flat-pin plug
  10. = Flat-pin socket
  11. = Solder tag or connector
  12. = Compartment number
  13. = Plug connector designation
  14. = Cables with no cross-section indicated are always 0.75 mm2
  15. = Earth (ground)

E1 Left rear fog light
H1 Left rear flashing turn indicator
H2 Right rear flashing turn indicator H3 Telltale light, instrument panel K1 Bulb tester
K2 Hazard warning flasher relay
X1 Connection for bulb tester, 8-pin
X2 Connection for bulb tester, 6-pin
X3 Plug connector, partial wiring harness, rear, 8-pin
X4 Connection for trailer power socket, 7-pin
X5 Plug connector, left rear light, rear fog light
X6 Plug connector, left rear light, turn indicator
X7 Plug connector, right rear light, brake light
X8 Plug connector, left rear light
X9 Plug connector, right rear light
X10 Plug connector, left rear light, 31

e.g. 110 — current path continuation (see main-vehicle electrical circuit diagram)

Color codes
BL = blue
BR = brown
GE = yellow
GN = green
GR = gray
RT = red
SW = black
VI = violet
WS = white
TR = transparent

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