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,...
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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.
451 Electrical Connectors
Accelerator Pedal AC Pressure sensor Aerial Airbag Controller Airbag Switch Blower Motor Brake Fluid Level Switch Dash Button Bank Door Connector Cabin Heater Duct Temperature Sensor ECU Secondary Engine Connector Front Fog Lights Front Radiator Fan Gearbox Controller...
451 Engine Mount Change
The 451 engine mount suffers badly from wear which allows too much engine movement, swapping it is very easy.
451 Engine Mount Repair
The engine mount for the 451 is quite poorly designed and splits causing the engine to move a lot.
Considering the cost of a new front engine mount you may as well just repair the original one.
451 ESP Controller Pin Out
The traction control (ESP & ABS) controller is attached to the side of the ABS pump underneath the car. It's shielded by the plastic undertray for protection. It's easily recognised by the several hard brake pipes coming from the unit. Pin Number Wire Colour...
451 ESP Removal
In case you need to spin the wheels to get you out of snow and ice or if you are running your car on a dyno, you need to disable the ESP system.
451 Euro4 Exhaust Retrofit
The Euro4 and Euro5 exhausts are very different but it's easy to retrofit.
451 Exhaust Removal
Fitting an exhaust to a non turbo smart fortwo 451.
451 Exhaust Types
The smart fortwo 451 ran from 2007 to 2014 and in those 7 years we saw a tightening of the emissions laws in Europe which meant that 451 exhausts changed. Due to the confusion, it seems necessary to create a visual list so people know what they need should they need...
451 Exterior Light 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 Facelift Retrofit
Do you own an old 451 but prefer the 2012 facelift bodykit? Time for a change.
451 Factory Cruise Control
This Is All Guesswork A few people have asked me about retrofitting the standard 451 cruise control with the buttons on the steering wheel. I have given them the information required but none of them have actually done it or got back to me. Is Your Car New Enough?...
451 Failed Clutch Actuator
Car Starts & Revs But Doesn't Move Yep, very common now on the 451. Snapped Clutch Actuator Spiral Gear The 451 and Forfour have very similar clutch actuators, both of which suffer from this same fault. Bigger motors and stronger compensation springs for quicker...