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Electrical guides and mods

ZEE Unit (Fuse Box)

The ZEE unit is the fuse and relay module that is used in 600cc smarts instead of the SAM unit that is found in 700cc smarts.

Modification Details

Difficulty

Credit

Evilution

Mod ID

545

Cost

For

450 Fortwo 600cc

The ZEE Unit

ZEE unit stands for Zentrale Einschub Elektrik which translated means Central Electric Module.

The ZEE unit is the 600cc version of the SAM unit. It carries the fuses in very
much the same way but the relays are all external so can be swapped over.

Where the 700cc SAM unit is one part, the ZEE unit comprises of 3 sections.

Fuses, OBD and partial relay holder.

ZEE insert module that controls the electronics.
Secondary fuse and relay box located under the seat.

Removing And Opening The ZEE Unit

The main ZEE connector (outlined red), if your car is doing strange things, check this isn't loose.

The ZEE insert slides out of the side.

The insert fully removed. Circled in yellow is the small speaker that makes all the beeping noises.

Surrounding the unit are plastic tabs, these are easy to unclip.

With all of the clips undone you can remove the top to reveal the cicuit board.

This is as far as you can get with viewing the ZEE insert, the rear plastic housing
cannot be removed without damaging something. Highlighted in blue is the outline of
relays L and M which are located on the other side of the ZEE insert circuit board.
These cannot be removed or changed unlike the other relays.

Todor T cut a hole in a ZEE unit to show us the relay. (2 relays in 1 package).

Main Fuse And Relay Holder

Located under the dashboard. The fuse ratings and layout can be found here.

From 16/11/1999

Relay	Coupe Function
A	Front fog lights
B	Boot solenoid
C	Rear wiper interval
D	Horn
E	Relief for igntion, heater and windows
F	Rear window heater
G	Front coolant and AC fan
H	Left turn indicator
I	Right turn indicator
K	Front wiper interval
L	Central locking (inside ZEE unit)
M	Central locking (inside ZEE unit)

Relay	Cabrio Function
A	Front fog lights
B	Soft top open
C	Soft top close
D	Horn
E	Relief for igntion, heater and windows
F	Boot solenoid
G	Front coolant and AC fan
H	Left turn indicator
I	Right turn indicator
K	Front wiper interval
L	Central locking (inside ZEE unit)
M	Central locking (inside ZEE unit)

Depending when your car was made, you could have hidden headlight relays or none at all., read further down.

Up to 15/11/1999

Relay	Coupe Function
A	Front fog lights
B	Central Locking Locked
C	Central Locking Open
D	NA
E	Rear Hatch Remote Unlocking
F	Rear window heater
G	Front coolant and AC fan
H	Left turn indicator
I	Right turn indicator
K	Front wiper interval

The wipers, horn and relays are separate from the ZEE, they are hidden behind the dash.

Headlight Relays?

This only applies to 600cc smarts made from 2002 onwards.

For some odd reason, smart decided to put the headlight relays elsewhere.
On a right hand drive smart, the relays are hidden behind the stereo.
On a left hand drive smart, the relays are behind the main instrument cluster.

If your 600cc smart was made before 2002, there were no relays for the headlights.

Main Loom Socket Wiring

A	Wire Colors	Connection	Fuse
1	Red Green	Wiper stalk
2	Grey Red	Wiper stalk
3	Grey Blue	Ignition position 2
4	Brown White	Safety triangle +v
5	Red Green	Wiper stalk
6	Blue	Blower switch
7	Yellow Black	Fog lamp switch
8	Black Green	Lighting stalk
9	Black White	Lighting stalk
10	Black	Door solenoid microswitch
11	Yellow White	Door catch microswitch left
12	Blue White	Handbrake switch
14	Yellow Red	Door catch microswitch right
15	Black Blue	Heater booster switch
17	Yellow Green	Restraint control
18	Brown	Earth
19	White Grey	OBD pin 1
20	Grey Green		26
21	Grey Black	ATA control unit
22	Brown Blue	Centre console lamp
23	Violet	ATA control unit
24	White	Key RF/IR receiver
25	Green	Safety triangle AC1
26	Grey	Safety triangle AC2
27	Black Red/Blue Red	Safety triangle window heater
28	Blue Yellow	Safety triangle lock
29	Violet Blue	Safety triangle hazards

B	Wire Colors	Connection	Fuse
31	Brown Red	Instrument cluster
32	Grey Blue	Central locking open
33	Red Green	Multi connector Z50/2
34	Red Blue		10
35	White Black	Instrument Cluster
36	White Blue	Central locking closed
37	Red White		15
38	Brown	Earth

Secondary Fuse And Relay Holder

Located under the carpet underneath the left hand seat.

Wiring

Connector 1

1	Wire Colors	Connection	Relay
1	Black Pink	MEG 1.0	K5
2	Red Black	Fuel pump	K5
3	Red Blue	Primary fuse box	K2
4	Red Blue	Primary fuse box	K2
5	Blue	MEG 1.0	K2
6	Black White	MEG 1.0	K2
7	Pink Blue	MEG 1.0	K2

Connector 2

2	Wire Colors	Connection	Relay
1	Green	Charcoal valve	K6
2	White Yellow	MEG 1.0	K4
3	Green Blue	MEG 1.0	K6
4	Red Green	Primary fuse box	K1 + K2
5	Yellow	MEG 1.0	K3 + K4
6	Red	Battery	K1 + K4
7	Brown	Earth	K1
8	Black Yellow	MEG 1.0	K3 + K5

Connector 3

M	Wire Colors	Connection	Relay
1	Green	Coil pack 1+2+3	K1
2	Green	Injector 1+2+3	K5
3	Blue	AC compressor	K6
5	Blue	Starter	K3
6	Yellow	Intercooler fan	K4
7	White	Wastegate valve	K6

Relays

Relay Number	Function
K1	Main Relay (powers F3, F4, K3)
K2	Auto transmission
K3	Starter Motor, Coil Packs
K4	Intercooler fan
K5	Fuel Pump
K6	A/C Compressor

Fuse	Rating
1	15 Amps
2	10 Amps
3	15 Amps
4	10 Amps

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