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#1
10-24-2006, 11:06 AM
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94 e420 check engine light LED issue
Hello, I am new to this site and somewhat new to the gas benz world. My check engine light came on last week with no noticable symtoms. I tried to check and reset the code using the built in LED. The instructions I was following was to turn the key to the on position, hold down the button for 2-3 seconds and it is supposed to flash the code. When I turn the key to on, the LED is on continuously, and the button does nothing. I am in the proccess of building the radio shack code scanner, but shouldn't I be able to get the diagnostic module codes from the built in LED? Any help would be greatly appreciated.
thanks, Will John 94 E420 82 300DT 
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#2
10-24-2006, 11:18 AM
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You do realize the led is next to the push button?????
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#3
10-24-2006, 11:21 AM
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yes
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#4
10-24-2006, 11:24 AM
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OK
..so , are you saying the led is ON without pressing the button?? or are you saying the led lights , but does not flash when you hold the button??
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#5
10-24-2006, 11:29 AM
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the LED is on continuously when the key is turned to the on position. Do I need to be trying this with the key in a different position?
thanks for the replys
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#6
10-24-2006, 11:31 AM
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NO
The lite only comes ON when the button is pressed and the key is ON See if you have 12v at pin 16 and ground
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