Narrowing the search for source of heated grips/seats malfun

[singring]

On my 2006 GL1800, with comfort package, zero heat from grips and seats. There was loss of continuity on left grip, replaced it, now there is continuity on both grips, but still no heat from grips or seats. Today, following Honda's bulletin for diagnosising the issue, I find there is continuity from the heater relay to the heat control unit on both the grips circuit and the rearseat heat circuit, however, there is no continuity from the heater relay to the heat contol unit on the front seat circuit. There is continuity throughout the front and rear seats themselves, so there is no break in the heating elements in the seats. I then did a test on the rotary control dials for both the grips and front seat. This turned up a weird, or so I thought, result. Across both switches (control dials) I was able to read 2.9 K ohms.
When I checked the resistance on the grip switch, from one lead to the center tap lead I got the following: OFF 0.0 K ohms
1 0.9 K ohms
2 1.6 K ohms
3 2.2 K ohms
4 2.6 K ohms
MAX 2.8 K ohms

When I checked the resistance of the front seat switch, from one lead to the center tap I got the following: OFF 2.9 K ohms
1 2.8 K ohms
2 2.6 K ohms
3 2.2 K ohms
4 1.6 K ohms
MAX 0.9 K ohms

in other words, the front heat switch is showing opposite readings compared to the grip switch. I did another test on the front seat circuit, checking for continuity from the heat relat to the heat contro unit, and I rotated the setting on the switch, but still there is no continuity. Does it not seem odd that the fron seat controlling switch is giving these readings? Any other suggestions, or ideas? Thanks, all assistance is greatly appreciated.

[Viking]

Here are a couple of links to some information that may or may not help:

http://www.justwings.com/uploads/TechNews1_1_.pdf

http://www.justwings.com/uploads/TechNews2_1_.pdf

[nvhom]

i have a 07 wing the hcu was replaced under warranty, now it has gone again this is $400 to replace, Is there any way to bypass this unit ?

[singring]

You can get the HCU here for $65.52 if you need to replace, item number 16: http://www.ronayers.com/Fiche/TypeID/26 ... NIT_('06-)

I found my fault using this excellent diagnosis procedure, as provided by WingAdmin viewtopic.php?f=7&t=14143

I found the fault at the seat connection...female connector had worn contacts, so I beefed up the pins on the male connector by running a trace of solder onto each of the pins. Good contacts now, and problem fixed. Yes, I did previously determine that the grips did not have continuity, so I replaced them both, but after I was still not getting any heat...turns out that I also had the seat connector issue. Now all is good.

Make sure your HCU unit is not functioning before you try replacing it. There is no way to test it, other than switching it out with a known operational HCU from a friend's GL1800...that is what I had to do

[nvhom]

my hcu is not working is there any way to bypass it intirely

[TerryRuth]

good luck this will drive you crazy and cost A LOT of money
there are FEW if ANY that know how to solve this problem
28 wires with 2 connections on each 2 fuses 6 heat pads 4 thermistors 3 switches HCU ECM I AM KNEE DEEEP IN NEW PARTS (over $700 ) and my seat's at the FIXERS Frieghts $200 and $200 labor in Honda shop
sad stupid series system

[joeincalif]

Since Honda came out with the comfort package there has been a lot of trouble. When I bought my new wing back in 08 I bought the base model, It is easy and cheaper to add heated stuff to the base model