Why the Main Relays are
design the way they do.
It's a known fact that the relay fail from
the poor solder application process. When the circuit boards are
mass dipped into a pool of hot solder the solder can seep into the circuit board creating bad solder application. Unlike
high quality double side cu-lead found in many computer
product, the main relay board is prone to this type of bad
Inside the vehicle, the solder has to go thru the heating, cooling and
vibration not to mention other inefficiencies such as poor
electrical part design, poor positioning of the solder joints
and poor selection of parts which only helps to increase heat.
Solder joint's can succumb to
resistance. By this time the
solder is damaged. You can see by the way the solder melts
compared to other solder on the circuit board.
There are simple solutions
for the main relay manufacturer. They simply have to check the
joints for quality standards on critical joints. The critical
joints are the relay coil and resistor terminals.
The most drastic method for
car owner is to
remove the previous solder and apply new solder but without
solder seep thru the terminal wire and the base material.
The way to do this is to block the solder from
flowing thru the circuit board. In this image below a copper
wire is used to wrap around the terminal to seal the joint. This method isn't
required if you choose a different type of solder.
You won't be needing a
soldering iron that exceeds 50-Watt or temperatures greater
than 600F. This is because of a cheap circuit board and
the unnecessary need to remove the thick solder terminals, usually
located on the edge of the circuit board. The terminals on the
edge of the board are large enough to dissipate heat on its
own thus these joints will not be affected by the usual problem of dry
joint. Also, if you are using a 100W or above soldering
iron the cu-lead may also
lift. Remember, do not be tempted simply touch the hot iron on
the joint. This will only fix the joints temporarily and may
lead to a serious problems, developing symptoms similar to
that of a defective ignition switch. We highly recommend
that you fix it right.
are many circuit board designs on cars that generate heat. Such one example is the dimmer control
unit or the fuel cut-off relay. Some of these generate less heat than a relay but yet have breath holes on
their casings to vent air. If main relays were made with
the ability to dissipate heat then there would be few main relay
related starting problems. There are no explanations why main relays are made this
way even when reports of this problems were coming in.
When we setup this website in
the main relay problem, we had in mind that this site will be
obsolete in a few year. It's been six years with 34,000 hits or
4551 page views per month (clocked by Tripod hosting) and this site is still being visited. Eventually,
I will moved this site completely to comply with Google's
The control units and relays are selected from a worldwide selection of electronic makers. Each maker designates a different scheme to
It's still unknown why some cars such as the Sterling (unknown year model) have a very identical (Mitsuba) main relay mounted in a different location - right under the steering column but yet havenít seem to have the same problems like the Accords, Civics or the
Integra in the 1986 year range. Itís a mystery to why the part supplier responsible wonít create a website for people to self diagnose their out-of-warranty vehicles. People have been upset by this problem for many years. Intermittently, their cars wouldnít start in gas station or parking lot. But under the light of all this don't let this problem bother
the Honda owners. Overall, Honda is a great company that pays
attention to it's environment. Toyota is also a good example
company that is looking forward towards make the rest of its fleet
The main relay is not a main issue the Honda Company has to address.
Honda motor co. should be focusing on is its ignition system.
This can range from the ignition switch to the coil, igniter or
rotor. Several cases people reported stalling in the middle of an intersection. Others have bad misfortune of stalling in the far left lane in a busy freeway sometime at 70 mph. Iíve been on call to several cases of people stranded in busy freeway only to find their ignition system have failed them. At all these instances, we had to tow the car or adapt a system for low speed
travel, or simply replace the rotor (two cases.)
With an education in Auto mechanic, electronics repair and robotic design in Delta College, the author continues
with electrical engineering course for a few semester in the University of Long Beach in California.
"I've grown up with Hondas since 14. I admire its ability to be electrically and mechanically
environmental friendly cars (not quite the same today). It was the first car
that Iíve known to be durable but yet gentle to the touch of our hands.
Chemicals used to make
the plastics, the PCBs and the rubber parts surpass those found on some other
automaker based on the price per part. Iím a fan of cars that are environmentally friendly.
Some vehicles are not environmentally friendly because they are difficult to renew and
simply are disposables. The quality of life can't be accomplish just by
developing low cost cars but rather those that won't create long term problems such as
or cancer). The ongoing fuel crisis should begin to fuel Honda and Toyota
to look harder into electric or electric hybrids vehicles. The overall great car should reflect its ability to make the world a better and productive place to live.
now, I believe, surpassing Honda in its ability to develop safe
and environmentally friendly vehicles based on the NHTSA.
Toyota has set new standards in auto design and engineering. I hope Honda Learns
from Toyota and improve itself."
Add your comments, suggest corrections or clarifications. Thanks.
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