Honda CRF 250 L headlight fail - ECU error

KTMphil

Senior member
Joined
Jan 11, 2011
Location
Chiang Mai, Thailand
Bikes
2007 KTM 990 Adventure Suzuki DRZ 400
Had the headlight fail on the Honda CRF 250 L. As most people would do, went and bought a new bulb. Fitted it and still didnt work.

Thai mechanic knew it would be an ECU error and was right.


His ECU reset tool

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About to reset

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Error code gone

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400 baht for the privilege


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Hi Phil
That must be some thai magic , depend the ECU has no connection to the headlight circuit .
Just double check the wirering diagram .

12 V from Batterie goes to the Main Fuse on the Starter Relais and from there direct to the Ignition switch .
From the Ignition Switch it goes via Fuse 6 to the Starter Switch (lights off when the starter turn) and from there
via the Hi/low beam switch to the Headligt Bulb and back to Ground /batterie minus .
There is nothing in this circuit that can be triggered by the ECU .

There is however a connection from Pin 13 on the ECU and this Pin is connect via a diode in the ignition Switch to +12V before the ignition Contact .
This Pin 13 is in the wirering Diagram also called IMOV and that stand normaly for the imobiliser connection and thats a thing the CRF don't have .
No Idea what this connection is for or if its really there , no Info about this Connection in the Fuel injection/ECU discription , but what ever it is i see no way how this could switch the Power to the Headlight of .

What your mechanic do is reset the DTC . That is where faults of the Ignition System gets stored and shown on the MIL in the Dash as blinking Code .
But there is no Code in the DTC for Headlight fault .
There was maybe a fault from way back stored that he delete but how that effect the Headlight is a mystery to me.
 
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