Heated Grips -- Technical Question

[ChuckH]

The wiring for the heated grips on my Stelvio, and probably the Norge and others, is installed at the factory, with only the grips being a dealer installed option. 

The function is very easy -- toggle and hold the switch (on the left h'bar) for a couple of seconds to turn them "on", toggle the switch quickly to change the setting from low/medium/high, toggle and hold for a couple of seconds to turn them "off".

The question -- How is the reduced heat setting accomplished on these newer bikes?

In my past experience with heated grips, various resistors were located in the wiring circuits to reduce the power to the grips for the lower settings.  But I've looked at the wiring diagram for this bike and it doesn't seem to have resistors in the circuit to the heated grips.  So how do they accomplish these reduced heat settings?

Thanks.

[Wayne Orwig]

The wiring for the heated grips on my Stelvio, and probably the Norge and others, is installed at the factory, with only the grips being a dealer installed option. 

The function is very easy -- toggle and hold the switch (on the left h'bar) for a couple of seconds to turn them "on", toggle the switch quickly to change the setting from low/medium/high, toggle and hold for a couple of seconds to turn them "off".

The question -- How is the reduced heat setting accomplished on these newer bikes?

In my past experience with heated grips, various resistors were located in the wiring circuits to reduce the power to the grips for the lower settings.  But I've looked at the wiring diagram for this bike and it doesn't seem to have resistors in the circuit to the heated grips.  So how do they accomplish these reduced heat settings?

Thanks.

PWM

Pulse Width Modulation

It turns it on and off very fast. At lower settings, it turns it off for a longer time, and on for a short time. At high settings, it is on longer, and off for a shorter time.

[ChuckH]

PWM -- Pulse Width Modulation -- It turns it on and off very fast. At lower settings, it turns it off for a longer time, and on for a short time. At high settings, it is on longer, and off for a shorter time. 

Wayne, thanks for the response.  Sorry for the delay.  Out of town.  Family thing.

PWM makes sense I guess.  Full voltage to the grips but for varying amounts of time.  No resistors, less heat to get rid of.  Probably the same as the Heat Controller for my heated jacket.  The red light is "on" all the time for full heat, it's "off and on" for lesser heat levels.

Do you know where they package the PWM Unit on the Stelvios?  It can't be very large if that is the only thing it's controlling.

Ride safe.

[bpreynolds]

Just asking,  how much are the factory heated grips?

[segesta]

Just asking,  how much are the factory heated grips?

They were $159 for my California 1400; I assume the same or very similar for a Stelvio.

[Chuck in Indiana]

Wayne, thanks for the response.  Sorry for the delay.  Out of town.  Family thing.

PWM makes sense I guess.  Full voltage to the grips but for varying amounts of time.  No resistors, less heat to get rid of.  Probably the same as the Heat Controller for my heated jacket.  The red light is "on" all the time for full heat, it's "off and on" for lesser heat levels.

Do you know where they package the PWM Unit on the Stelvios?  It can't be very large if that is the only thing it's controlling.

Ride safe.

I'm totally clueless, but would *assume* the ecu does it.

Edit: Well duh. I know a lot more about how this stuff works, now. :) I need to learn to keep my fingers off the keyboard..

[ohiorider]

I believe the time proportioned output is provided via output pins from the BNS12 dashboards.  The pinout for the 1200 Sport shows pins 38 and 39 providing the power to grips (17 & 18).  One + power pin per each grip, with the neg grip wires being tied to common ground.

[Wayne Orwig]

Wayne, thanks for the response.  Sorry for the delay.  Out of town.  Family thing.

PWM makes sense I guess.  Full voltage to the grips but for varying amounts of time.  No resistors, less heat to get rid of.  Probably the same as the Heat Controller for my heated jacket.  The red light is "on" all the time for full heat, it's "off and on" for lesser heat levels.

Do you know where they package the PWM Unit on the Stelvios?  It can't be very large if that is the only thing it's controlling.

Ride safe.

Part of the dashboard.

[ChuckH]

   Part of the dashboard. 

Thanks.  Now that I know what I'm looking, the hot leads from each heated grip go into the dashboard.  Good to know.

[ChuckH]

Just asking,  how much are the factory heated grips? 

The factory heated grips were initially in the $300. range.  Then Guzzi reduced the price to about half of that, so the $159. quoted above sounds reasonable. 

The grips my dealer installed are a "Koso" brand.  They cost about $75.  They connect right to the factory wiring/connectors and are operated with the factory installed wiring/switch.

Hope this helps.

[smdl]

Sorry for reviving an old thread, but I have just purchased a Norge that is partially disassembled, and am looking for information on the factory heated grips.  First, how are you supposed to tell what setting the grips are on (or if they are on at all)?  Does this normally show on the dash?  The manual doesn't seem to give much info.

Also, is there any issues with changing out the grips?  Mine are splitting, and I want to change them to a set of Pro Grip 714s, but I don't know if anything special is required for the heated grips.  Do I need a larger grip?  Should I use grip glue or not?

Any thoughts would be greatly appreciated!
Cheers,
Shaun

[Kiwi_Roy]

It stands to reason that the grips would be a bit larger.
I doubt the brand would matter the transistors doing the switching are likely rated at many times what the grips draw.

[toma nova]

Sorry for reviving an old thread, but I have just purchased a Norge that is partially disassembled, and am looking for information on the factory heated grips.  First, how are you supposed to tell what setting the grips are on (or if they are on at all)?  Does this normally show on the dash?  The manual doesn't seem to give much info.

Also, is there any issues with changing out the grips?  Mine are splitting, and I want to change them to a set of Pro Grip 714s, but I don't know if anything special is required for the heated grips.  Do I need a larger grip?  Should I use grip glue or not?

Any thoughts would be greatly appreciated!
Cheers,
Shaun

My 1200 Sport had the wiring under the tank - two or three small white Molex connectors.  Factory grips plug right in, aftermarket need to be wired in;  I would just cut off the connectors and solder the aftermarket in.  I also had to add a momentary switch as the 12S does not include one from the factory.  Once all wired up, the dash displays a grip icon with three bars to indicate setting.  I used Dual Star heating elements and Pro Grip gel grips, installed with rubber cement.

On my Stelvio, there is a switch on the left bar so the installation was only two connectors - the MG heated grips are integrated (heaters and new grips) just like Oxford so you replace the whole grip.

HTH,
Tom

[Gliderjohn]

Quote from xmdl:

Sorry for reviving an old thread, but I have just purchased a Norge that is partially disassembled, and am looking for information on the factory heated grips.  First, how are you supposed to tell what setting the grips are on (or if they are on at all)?  Does this normally show on the dash?  The manual doesn't seem to give much info.

It does show on the dash. It shows one bar for low, two bars for medium and three bars for high. You have to hold the switch down a few seconds to turn them on or off. a short hold changes the setting. If you do not turn the heat off before you shut off the bike they will automatically come back on when you next start the bike.
GliderJohn

[smdl]

Thanks, folks -- that's a big help.  My Norge has the grips in place, and I think they work fine (the bike is partially disassembled, and I must make sure everything is connected properly).  I just need to put new rubber grips over top of the factory warmers, and wondered if I needed anything special.  I was sure I had heard, at one point, that 1" grips vs. 7/8" should be used when there are warmers underneath.  I also wondered about whether or not the grips should be glued to the warmers.  Will keep researching.

Thanks,
Shaun

Edit:   Okay, I managed to get the grips working, and could see them on the display.  I just needed to get the dash out of the MODE mode!

[rboe]

Ideally I'd have both (Honda wants a small fortune for the grips on a CB1100, the brake side on my Griso heats the bar more than my hand) but have found heated glove liners much nicer. They heat all around the hand, not just the inside. Not as user friendly as heated grips as you have to plug in the gloves to the jacket liner then to the bike and reverse when you get off but on really cold mornings they can't be beat (except by the heater in a car - with heated seats!  ;D ).

[richthib]

I have a technical question.  I have a factory OEM set of heated grips I never installed on my 2007 Breva 1100.  Does anyone know if they will fit on my new California 1400 Touring?  Are the connectors and grip sizes interchangeable?  Thanks.

[Lcarlson]

Heated grips are one of the best accessories you can buy, IMO.  I've had them on my BMWs for years -- wouldn't be without 'em. Seldom need to use my Gerbings gloves around here. I'm anxious to see how they work on my Cali 1400 (haven't had the occasion to turn them on yet). Soon enough -- maybe in VT next week.