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Fan harness pins?

 
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  • 1 Post By ptcruisersteve
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Old 02 May 2019, 08:05 pm
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Default Fan harness pins?

My radiator fan isn't working, the 4 pin connector is bypassed by a garage about a year ago due to wiring issues, can anyone tell me what each pin on the 3 pin harness is and what voltage I should see so I can tell if I need to replace the radiator fan, of if it is a wiring issue
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Old 02 May 2019, 08:48 pm
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Default Re: Fan harness pins?

You should put the plug back in. Usually you simply unplug it and apply 12 volts to the connectors in the low and high relays but in your case you can't do this. With the Canbus system you need to be careful.
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Old 03 May 2019, 04:47 am
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Default Re: Fan harness pins?

AJ; your car came with a 4 prong connector. A large red fused wire [50 amp fuse]. A large black wire [ground]. And two small wires which energize the two relays. One relay for high speed, one relay for low speed.

My guess is that the 3 prong connector has a ground, a high speed, and a low speed wire connected to the fan motor.
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Old 03 May 2019, 07:17 am
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Default Re: Fan harness pins?

Yeah it's a bit confusing I have a 4 pin that goes from the main wiring harness to the fan relays ontop of the fan, and from those a 3 pin that goes to the fan motor, I cannot test the 4 pin connector as the wiring is broken and the connector has been bypassed, I need to see if there is power coming from the 3 pin
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Old 03 May 2019, 09:58 am
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Default Re: Fan harness pins?

Why not disconnect the 3 wire plug going directly to the fan motor and apply 12 volts to the high and low speed wires. This will tell you if the fan is good or bad.
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Old 03 May 2019, 12:29 pm
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Default Re: Fan harness pins?

Quote:
Originally Posted by ptcruisersteve View Post
Why not disconnect the 3 wire plug going directly to the fan motor and apply 12 volts to the high and low speed wires. This will tell you if the fan is good or bad.
This is the easy method I used to test my fan motor, before replacing it - suggested by a forum member at the time as I was having trouble with the wiring.
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Old 07 May 2019, 07:42 am
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Default Re: Fan harness pins?

I ended up taking it to a garage that had to rewire the fan last year, they diagnosed a bad ground and a bad wire for the low speed from the pcm to the fan. All fixed for $270. Also got them to do an alignment and new tie rods while it was there.
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