If there is no voltage at Socket #2 (Red/Blue wire) of X1797 with Ignition ON, then check fuse F92 to see if it is blown.

The small blackĪnd blue wire has 4.20 volts both with the AC off and on. There is no voltage at the red and blue wire. I did as you said and with the engine off and

The small black and blue wire has 4.20 volts both with the AC off and on. I did as you said and with the engine off and there is no voltage at the red and blue wire. At stationary idle, fan should operate at slower speedĢ) If NO E-Fan operation, turn engine OFF, and disconnect Connector X1797 from the Fan Unit.ģ) With Ignition ON (engine still OFF), using Multimeter, measure Voltage in Reference to Chassis Ground at Pin#2, Red/Blue wire.Ĥ) Check for continuity to Ground at Pin #1, Brown wire.ĥ) Test for Voltage at Pin #4, Black/Blue small wire, in reference to chassis ground: a) with A/C Compressor (Snowflake) OFF but engine running ī) with A/C Compressor ON and engine running. If you do NOT have INPA/ISTA or something that can 'Activate' the E-Fan, about all you can do is test as follows:ġ) With engine running, turn on A/C Compressor. See the attached ISTA ScreenPrints showing the Fan Wiring Diagram, Power supply, Lines ID, & X1797 Connector View. If the fan electronics are NOT alreadyĭamaged, you would likely damage them by applying 12V+ to Pin #4 (the small wire). HOWEVER, you CANNOT get the Fan to run by applyingġ2V+ & Ground to the two large wires, Red/Blue at Pin#2 & Brown at Pin #1. Signal via the Black/Blue wire to Pin #4 of Connector X1797.

If you had INPA/ISTA, you could 'Activate' the fan by sending a speed The E-Fan has a built-in Electronic Control. The short answer to your question is: 'You DON'T'. My radiator fan will not turn on I just want to see if it's the fan or something else.

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