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Towing Smart - battery isolator

InfaRed

Joined: Nov 09, 2010

Posts: 72

MH: CI Cipro 85

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Anyone towing a smart car - do you have a battery isolator switch fitted?

Read the manual and it seems to suggest that this should be carried out when towing.

Ian

GerryD

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Joined: Sep 20, 2007

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No,
Gerry

DJP

Joined: May 09, 2005

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No, never on any car and I can't think why you would need one either?
Where did you read that?
Smart say you should not tow anyway, but we all know what a load of rubbish that is!

______________________________________________________________
Be seeing you! No. 6

InfaRed

Joined: Nov 09, 2010

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Read it in an Owners Manual.

Quote:
"Flat towing
Flat towing is when all wheels of the vehicle are on the ground during the tow.
For vehicles that will be flat towed over long distances observe the following
recommendations:
X Preparing the vehicle: Contact an authorized smart center for information on recommended tow bar equipment and installing a matching on/off switch on the battery terminal.
X Before towing: Make sure the ignition is switched on.
X Engage the parking brake.
X Depress the brake pedal and keep it pressed.
X Move the gear selector lever to neutral position N.
X Release the brake pedal.
With the gear selector lever in neutral position N, the key cannot be turned fully to starter switch position 0. Therefore turn the key in the starter switch as far left as it will go when switching off the
ignition.
X Switch off the ignition.
X Leave the key in the starter switch.
X Wait approximately 30 seconds until the multifunction display in the instrument cluster is completely blank.
X Turn the battery off using the previously installed battery switch.
X Release the parking brake.
X During towing: Make sure the gear selector lever remains in neutral position N with the ignition switched off.
X After towing: Engage the parking brake.
X Turn the battery on using the previously installed battery switch.
X Move the gear selector lever to park position P.
X Remove the key from the starter switch.
X Lock the doors.
Do not flat tow the vehicle with the front axle raised. Doing so may cause serious damage to the brake system which is not
covered by the smart Limited Warranty.
Failure to follow the recommendations for flat towing can cause damage to your vehicle:
Not following the battery disconnect procedure in the proper sequence may result in data loss in the vehicle’s control units.
Not disconnecting the battery and leaving the key in starter switch position 1 (ignition on) may result in
- the vehicle locking. The vehicle will lock if the wheels are turning at
vehicle speeds of approximately 8 mph (14 km/h) or more.
- the ESP® being activated. Active braking action through the ESP® may seriously damage the brake system which is not covered by the smart Limited Warranty."

Ian

SmartTow

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InfaRed wrote:

Read it in an Owners Manual.

The old UK User Manual did not include, in fact went against, flat towing.

However, since the new shape (451 model) was manufactured for the USA market the User Manual was revised to include flat towing.

The procedure the User Manual describes is designed to ensure the vehicle is not towed in gear and to ensure the ESP system does not detect wheels turning outside of parameters sensed across all 4 wheels. If the ESP system thinks the car is out of control it will use the brakes to try and regain control.

If the ignition is switched off this should not be a problem and an isolator switch ensures there cannot possibly be any power to the ESP.
Hence a Smart must not be towed with two wheels off the ground and two wheels turning!

Alan
07950 968348

Not following the User Manual advice can become very expensive!

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