Pre-Facelift DRLs The first type of daytime running lights available for the 451 was this type. They consist of a pair of Hella lights and surrounds. Smart part number A 451 820 00 61. However, if you buy them from smart, they'll be ridiculously expensive. So, do a...
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Kane Harrison
451 Drop Link Removal
The 451 drop links are fairly easy to remove (unlike the 450 fortwo and Roadster). They look like this, see below. The silver one is standard and the black one was the replacement. You will need a 17mm ring spanner and a 5mm allen key, however, a 17mm ratchet can also...
451 Dump Valve
Because I wanted a dump valve on my 451 turbo, we spent thousands having having custom silicone pipes made by Forge Motorsport. They cost us an absolute shitload each so we stuck the rest on SmartMods just in case anyone else wants to do the same. This is the T piece....
451 ECU Pin Out
451 ECU Pin Out This is a mash-up of all of the connections for all 451 models. You may not have all of the listed connections. It's a work in progress. I'll add connections as I find them. Connector Diagram Thanks to Joris J from suprasport.nl for this connector...
451 ED 12v Power Usage
The Smart 451 ED has 2 batteries, well, it acually has 94 batteries but 93 of them make up the 400v drive battery. It also has the standard 12v lead acid battery that you'd normally get in a petrol and diesel smart. It's this battery that runs all of the electronics...
451 ED 22Kw Charger Info
Everything You Didn't Know About The Brusa 22kW 451 Charger ...and didn't really want to know. This is the 22kW charger box found in the 451 ED. Apparently it was the 1st 22kW in an electric car. It's bigger than you think too. It's nearly half a metre wide. It has 2...
451 ED Battery Cell Charging
Traction Battery Voltage The 451 ED 400 volt traction battery contains 93 separate cells, all wired in series. At an absolute maximum, lithium ion cells should be charged to no higher than 4.2 volts. 93 cells at 4.2 volts = 390.6 volts but they call it a 400 volt...
451 ED Desiccant Cartridge
What Is A Desiccant Cartridge? Electric doesn't like water but high power batteries and water can cause serious issues. A desiccant cartridge pulls all of the water out of the air inside the battery. This reduction in humidity stops the formation of condensation...
451 ED Heater Fault
A new common problem started appearing quite regularly on 451 Electric Drive Fortwos, the heater stopped heating. Sometimes it'll work for a while and stop working again. The issue here is that when you own an electric smart, if you want to use the heater, you must...
451 ED HV Battery Opening
This is the high voltage battery removed form a 451 electric drive fortwo. It's 178kg of nearly unmovable nightmares. All around the outside, if you look carefully, there are discoloured spots along the outside lip. I have marked them yellow below. The discolouring is...
451 ED HV Battery Removal
This job isn't to be taken lightly. You will need some specialist equipment but it can be done at home in your garage if you really have to. Step 1 is that you have to lift the car high enough so you can get the battery out on some sort of trolley. If you have a...
451 ED HV Disconnect Plug
If you are doing any electrical work on your 451 ED, you really should disable the high voltage battery. This is easily done. Make sure the car is turned off before disabling the HV battery. Look underneath the dashboard, next to the fuse box. See the red plug, pull...
451 ED HV Heater Change
If the ED heater fix didn't work, you'll have to replace the heater pack. If you have a left hand drive car, your job is easy, just pull back the footwell carpet, remove the polystyrene footwell block and you'll have access to the heater in the cabin airbox. However,...
451 ED HV Mega Fuse
If you have a catastrophic high voltage electrical failure, the battery has a safety feature to stop all of that fire, sparks, screaming, running around and gnashing of teeth as everything in the local vicinity also sets on fire. This fault could be a damaged HV cable...
451 ED Inverter Removal
Every 10 months or so, my 451 ED would suddenly lose power and show "Drive Sys Eng Off". Even though it would restart immediately after turning the ignition off and on again, you had to come to a complete stop in order to restart the car. Somewhat scary if you were...
451 ED Noise Maker
Electric Smarts Make A Noise In many countries, the Government have panicked and demanded that all electric cars make a noise. This noise is a pedestrian warning for idiots who don't look before crossing the road. Smart call it an Acoustic Presence Indicator. Other...
451 ED Onboard Charger
I'd been driving my 2013 451 ED for over 4 years with very few issues. Once a year it would cut out but restart immediately with no issues. The error code was about the contractors and they were quite loud when they closed. Then in Q3 2022 I started getting a warning...
451 Electric Mirrors Retrofit
Important Note If your 451 was built from 12/2008 onwards, this job is going to be much easier. If your 451 was built 11/2008 or before, the extra nonsense is nailed onto the end of this page. You Will Need 2 new door wiring looms with the appropriate connectors. A...
451 Electric Mirrors Wiring
Key:
E = Earth
C4/8 = Connection plug 4, pin 8
Fuse* or F* = Direct connection fuse number
Black Yellow = Wire colour
Modules are labeled in the picture.
451 Electric Window Wiring
Key:
E = Earth
C4/8 = Connection plug 4, pin 8
Fuse* or F* = Direct connection fuse number
Black Yellow = Wire colour
Modules are labeled in the picture.