Main fuse box 727 for B207, in engine bay

 Location

The electrical centre in front of the battery

 Main task

Act as the electrical centre for the engine management system T8 as well as the petrol pump relay 102, which is located in the compartment under the right A-pillar.

 Type

Electrical centre with relays, maxi and micro-fuses.

 Connect

The electrical centre is integrated into the engine harness.

Power supply, main fuse box 727

 Fuses

No Amp Type Function Illustration
1

-

-

-



2

20

+30

Via relay 443:

heated oxygen sensors (271)

Via relay 102:

fuel pump (323)



3

10

+30

A/C compressor (170)



4

30

+30

Via relay 229:

Trionic T8, switch A (589A)

solenoid valve, charge air (179a)

mass air flow sensor (205)

injectors (206)

ignition coils (320)

EVAP canister purge valve (321)

solenoid valve, EVAP shut-off (588)

test module (740)





 Relays

Location No Description Illustration Diagram
2

156

A/C compressor relay





3

443

Heated oxygen sensor relay





4

229

Main relay, engine management system



J45

J37