BMW AG Motorcycle (K1100LT, K1100RS). Manual - part 42

61.3

61

Technical Data

K 1100 LT

K 1100 RS

Battery

Ah 19

61.4

61.5

Removing and installing Motronic 
control unit

e

 Caution:

Switch off ignition, disconnect and insulate earth 
(ground) lead!

•

Open dualseat.

•

Press catch (1) for multi-pin plug and detach 
plug.

•

Loosen screws (2) and remove control unit.

X 

Tightening torque:

Motronic control unit ...................................... 5 Nm

LT610010

2

1

61.6

[ABS I] Removing and installing 
control unit

e

 Caution:

Switch off ignition, disconnect and insulate earth 
(ground) lead!

•

Switch off ignition, disconnect and insulate 
ground lead!

•

Open dualseat.

•

Press catch (1) for multi-pin plug and detach 
plug.

•

Loosen screws (2) at left and right and remove 
housing (3) together with control unit.

•

Remove ABS control unit (4) from housing (5).

•

Install in the reverse order of removal.

L

 Note:

Ensure that lug (6) on housing (3) is fitted correctly in 
the battery support bracket.

[ABS II] Removing and installing 
control unit

L

 Note:

[ABS II] The control unit is on the pressure modula-
tor.
For removal, see Group 34 “Removing and installing 
ABS unit”.

LT610020

4

3

1

5

2

6

61.7

Removing and installing battery

e

 Caution:

Switch off ignition, disconnect and insulate ground 
lead!

•

Remove Motronic control unit.

•

[ABS I] Remove ABS control unit.

•

Disconnect positive lead.

•

Detach vent hose (1).

•

Install in the reverse order of removal.

L

 Note:

First connect positive pole, followed by negative 
pole. Coat battery terminals with acid-free grease. 
Fit battery vent hose without kinks.

LT610030

1

61.8

Relay locations (central electrical 
unit)

•

First remove the fuel tank in order to remove a 
relay.

1. Lamp control unit
2. Start relay
3. Turn indicator relay
4. [ABS I] ABS relay

L

 Note:

With ABS II the relay is on the ABS unit. See 
Group 34 “Removing and installing ABS relay base”.

5. Motronic relay
6. ABS warning relay
7. Fan relay
8. Horn relay
9. Fuel pump relay
10.Load relief relay

LT610040

6

9

10

3

1

2

5

7

4

8

61.9

Locations and connections, ABS 
wiring loom

L

 Note:

All ABS plug connections are blue.

1. [ABS I] Multi-pin plug, ABS control unit
2. [ABS I] Plug connection, front pressure 

modulator

3. [ABS I] Plug connection, rear pressure 

modulator

4. Plug connection, front sensor
5. Plug connection, rear sensor

L

 Note:

[ABS II] See Group 34.

LT610050

5

1

2

3

4

61.10

Locations, frame wiring loom

View from left

L

 Note:

When removing the wiring loom, also remove the 
central electrical box together with the wiring loom.

1. Central earth (ground) at frame
2. Plug connection for tail light
3. Equalisation loop
4. Headlight connection
5. Parking light connection
6. Left multfunction switch connection
7. Alternator connection
8. Battery connection (positive)
9. Starter connection
10.Socket connection
11.Choke line
12.Plug connection, engine wiring loom
13.Auxiliary instrument connection
14.Fan plug connection
15.Clutch switch plug connection
16.Instrument cluster connection

Wiring arrangement, fairing bracket, 
[LT]

LT610060

8

15

12

3

4

14

7

13

6

1

2

5

9

10

11

16

LT610070