453 Horn Doesn't Work This is a new one that's appearing more regularly on the 453. What confused me was that most people also had issues with their headlights in some way. So, I took a long look at the terrible wiring diagrams for the 453 to see if I could find a...
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Kane Harrison
453 Horn Upgrade
Like all previous smart models, the horn is an embarrassment. A single unit that's far too quiet. What we need is a pair of tone matched horns (high and low frequency). Remove the front panel to access the main horn. It's just below the offside headlight... ...hidden...
453 Ignition Key Stuck
My Ignition Key Won't Come Out! Yep, it's a new common problem, only on petrol 453's with an automatic gearbox or the 453 ED/EQ electric drive cars. Why Doesn't It Just Come Out Like A Normal Key? On the manual cars, the car doesn't care what position the gearbox is...
453 Indicator Bulb Change
Small Access Panel Look into the front edge of the front wheel arches on your 453. You'll see a flap. Pull the tab down and pull the flap by the central finger hold. You don't need to jack the car up to gain access but if you need more room, go for it. Just steering...
453 JBL Boot Sub Woofer
Removable JBL Sub Woofer Information This is the sub that can be bought from smart (part numbers coming later with the other parts required). It's a fairly compact bass box that can be fitted and removed from the left hand side of the boot. The speaker is 165mm in...
453 JBL Tweeters
Important People, will you please stop getting ripped off! I have lost count how many times I have heard someone say: "smart/Mercedes will be expensive for parts so I bought parts from somewhere else" Where do you think these 3rd party companies buy these specialist...
453 Key Fob Battery
453 Original Style Before smart transistioned over to the flip key style, we had this crappy Renault key. Flip it over and... ...remove the screw. The blade can be pulled out if you want. You don't have to. Pull the 2 halves apart and you'll see the CR2016 battery in...
453 Lambda Sensors
Non Turbo B90 Position Number Of Wires Bandwidth Part Number Upstream (manifold) 5 Wideband A453 542 05 00 DownStream (catalytic convertor) 4 Narrowband A453 542 06 00 Turbo B91 Position Number Of Wires Bandwidth Part Number Upstream (turbo) 5 Wideband A453 542 05 00...
453 LED Indicator Coding
Fast Flashing If you fit LEDs to any of the indicator bulbs, there is a good chance that you'll experience fast flashing. This could be replacement LED bulbs, replacement full LED front or rear lights. Coding It Out If your car is 2017 or newer, you should be able to...
453 Light/Wiper Stalk Removal
The top cover behind the steering wheel is just clipped in place. Just lift it up with a bit of force. Look under the steering wheel, you'll see 2x Torx20 screws. Remove them. Pull the bottom cover down. You'll then have access to the 2x Torx10 screws holding...
453 Mirror Cap Removal
So, you want to remove the outside mirror cap since it's been smashed to pieces or you want to paint it. Firstly, you have to remove the mirror. See here. With the mirror removed, you can see 3 screws holding the adjuster in place. Remove them with a Torx10 bit. The...
453 Mirror Glass Removal
So, you either broke the mirror or need to get the mirror cap off. Adjust the mirror all of the way in... ...so you have enough room to get your fingers behind the mirror. Don't pull the mirror from the edge, try and reach behind the mirror to pull it off. It should...
453 Multimedia Radio Pin Out
This is the rear of the radio unit that connects to the touch screen multimedia unit. It is the most basic version of the radio unit. It is hidden behind the dash. The 3 main connectors are: BB - Speaker outputs, power input and earth. BC - Data outputs and inputs to...
453 NA Brake Upgrade
Better Discs? If you have the non turbo or the ED/EQ 453, you have the 12mm single thickness discs (lower disc shown below). You can fit the 22mm double thickness vented discs from the turbo 453 (upper disc shown below). These are Brembo 09.9078.75 discs. They are...
453 Oil Change
The 453 fortwo and forfour has a oil sump plug so I guess we should use it. I usually have a few empty containers like oil or screenwash. Grab a box cutter knife and cut a window in the top. Start the car up and get it running. When the temperature gets to normal...
453 Paddle Shift Coding
This was using DDT4All 5.4.0 but I would suggest using the newest version you can download from Github. Earlier versions of DDT4All may not have the correct buttons. Also, depending on your car, DDT4All version, language settings, how you connect to the car and the...
453 Passenger Airbag Disable
If you want to fit a rear facing baby seat to the passenger seat of your fortwo, you should turn off the airbag. If you have seat side airbags, you'll have to turn off the passenger airbags for both forward and rearward facing baby seats. Open the passenger door and...
453 Phone Holders
OEM Phone Holder This is the standard phone holder available from smart and Renault (for the Twingo). It's massively over-priced and even 2nd hand, they sell for too much. The other problem is that they are rare 2nd hand and they won't hold every phone due to the...
453 Proximity Alarm Disable
Some versions of the 453 have interior sensors for the alarm. The coupe has ultrasonic sensors and the cabrio has interior protection sensors. It looks like these can be deactivated in DDT4All. Interior Proximity Alarm Deactivation Start DDT4All and connect to the...
453 Puncture Repair Kit
Look in the passenger footwell, under the dash, towards the fire wall. See the tri-wing nuts? Remove them. Grab the entire footwell piece and pull it out of the footwell. Flip it over and admire the contents. The pictographic instructions are on the...