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Headlight Defroster Idle-up Diode

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jw4free

15+ Year Contributor
147
76
Dec 3, 2008
Billerica, Massachusetts
Finally made it into the cool group.....

I'm doing a wire tuck on my '95 gsx. The Mitsubishi electrical service manual shows a circuit from the Headlight and Defroster relays to a Idle-up Diode, going to the ECM. (It's like page 103 or so of the manual).

There is no wire at the ECM, nor could I find the actual diode in the dash harness. Does this circuit exist, and if so is it important?
 
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