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Topic: SOLVED !! internals of the auto lamp module (Read 15267 times) previous topic - next topic

SOLVED !! internals of the auto lamp module

i tried to manipulated the auto lamp relays by injecting 12v power on the white pink wire.

I am 90% certain this is now bad
both auto lamp relays energize and de energize and have continuity across thier outputs when energized, no continuity while de energized.

the middle of the end of the board is pin3 which ties in the diode on the leading edge of the two back to back transistors.
I replaced this diode because it was reading odd even with one leg lifted.  I installed a new one that was the same physical size with no luck.

i found one leg of the large capacitor was loose,, not sure why and it did not appear heat damaged, i heated it back up for a connection.

nothing appears to be burnt, however my son says the clear type diodes he see's one of them where the interior gap seems different from the one right next to it.  either way i am now in the serious market for a huntron.,, these are the very best tool to use and not having to worry too much about lifting legs on things and such.  diodes / transistors read as a "V" depending on which way you read them, resistors read as straight lines but diagonal any vector angle you can imagine proportional to thier resistivity, capacitors read as a elipse depending on thier farads.

anyhoo, got asked to post this so here it is.

which part would you replace next?

SOLVED !! internals of the auto lamp module

Reply #1 –
oddly enough, just fyi, my part number is

"LECTRON PROD.2
E1SB-14A597-AiA 1A"

but,, on the lid of the "dog house"  it has 7EA stamped in.

number systems would indicate this is an 81 pn,, yet this is an 87 car

SOLVED !! internals of the auto lamp module

Reply #2 –
What does it do? I have one working module in front of me, so you can ask on specific details, readings or so. I can measure it for you.

Let's start with the wiring diagram

SOLVED !! internals of the auto lamp module

Reply #3 –
I am so appreciative of this,, thank you so much.

for this to work, we have to activiate the card so our ref values are
-have your headlamp switch off
-have auto lamp switch on set to just after the thumbwheel clicks from off to on.
-have auto dim switch on set to just after the thumbwheel clicks from off to on.
 

i am looking for voltage reading on the + and - side of each diode as shown below.
I am looking for the voltage at pin 1 of the IC as shown.

if you feel like you can,, the voltages on the capacitors would be nice but if you cant,, i understand.

Also, the Q1 / 2  CBE readings

again, make sure your two auto lamp / auto dim thumbwheels are just after the off where they click to on, i can set mine to that exact setting so we are comparing apples to apples.

thank you !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

SOLVED !! internals of the auto lamp module

Reply #4 –
oh, what does it do,,,,,,,,,,

well, it has to be in your car and it has to be installed.
it is typically dead center of the top of your dashboard,, does your car have auto lamps?

SOLVED !! internals of the auto lamp module

Reply #5 –
i suppose from your situation you show, you could apply power to the two legs and apply the ground as required, that should power up the card to get readings

SOLVED !! internals of the auto lamp module

Reply #6 –
I got it from one Crown wic with burned motor bay.

Here are the values. C is cathode, A is anode.

.........on......off
pin1:..5,9.....5,9
D1C:...14.......0
D1A:...14.....15,8
D2C:...5,1.....5,1
D2A:...1,3.......0
D3C:...5,1......0,5
D3A:..1,25.....0,5
D4C:..13,4....15,1
D4A:..14,1....15,8
D5C:..13,5....15,2
D5A:..14,1....15,8

I'll check the transistors in a minute.

SOLVED !! internals of the auto lamp module

Reply #7 –
are you using the "comma" as a "." ,, meaning 5,9 = 5.9vdc?
 

SOLVED !! internals of the auto lamp module

Reply #8 –
D4 and D5 make sense, silicone diodes apparently, not germanium.
D1-3 dont make sense but maybe they are breadboarded that way.

SOLVED !! internals of the auto lamp module

Reply #9 –
and to be honest id dont know if the Q's are 2222's or 2907's

SOLVED !! internals of the auto lamp module

Reply #10 –
I'll bet now looking at your readings that the D1 is downstream of the two back to back transistors and one of these Q1 or Q2 is blown.

SOLVED !! internals of the auto lamp module

Reply #11 –
D3 makes sense too. It's the antiparallel diode for relay. Yes, comma means the dot (in czech language we use comma)

Here is the rest of the values.

.........on......off
C1C:..2,4.....3,4 - there is the threshold voltage of 2,6V. if it drops bellow 2,6V it turns on.
C1A:..5,1.....5,1
C2C.....0.......0
C2A - connected to C1C
C3C.....0.......0
C3A.....0......0,5

Q1 on (from the top): 0...1,25....0,65
Q1 off .....................0...0,5.....15,3
Q2 on ...................14,1..13,3...13,9
Q2 off ...................15,8....*.......0

* unable to measure. when I placed there the multimeter spike, it showed 16,3, but the test bulb (instead of rellay) turned slightly on.

SOLVED !! internals of the auto lamp module

Reply #12 –
great!! thank you ,,,
now my turn,, warming up the garage now,,, all done with my work engineering package for Bennington Vt,,,

SOLVED !! internals of the auto lamp module

Reply #14 –
one last thing before i go,,
explain your bench test,,,  power input and ground
were you powering up the one you show in the picture with a remote power source?
or were you reading a card that was hooked up to your car.

i assume you applied power to the two legs needing power,, correct? from a 12v source?