P1489 and P1490, how can I test a relay? - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
 
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post #1 of 7 (permalink) Old 07-08-2011, 12:21 PM Thread Starter
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P1489 and P1490, how can I test a relay?

so my intrepid threw a couple codes yesterday and overheated.

the relays are 5 prong, is there a way to bench test a relay using a mulltimeter?
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post #2 of 7 (permalink) Old 07-08-2011, 01:05 PM
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Yes.
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post #3 of 7 (permalink) Old 07-08-2011, 01:07 PM
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Oh! You want to know how to do it.

Will post details in a few minutes.
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post #4 of 7 (permalink) Old 07-08-2011, 02:16 PM Thread Starter
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Quote:
Originally Posted by peva View Post
Oh! You want to know how to do it.

Will post details in a few minutes.
thanks, the dealer wanted to charge me $85 to test the 3 relays.
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post #5 of 7 (permalink) Old 07-08-2011, 02:48 PM
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Of course you could swap identical relays to see if problems move with a suspected defective relay.

We well use the lo speed fan relay in the PDC - same info. applies to all of the 5-pin relays.

Overview of PDC:




Zoomed in on the PDC overview to see the pinouts on the lo speed fan relay socket:



Schematic of the lo speed fan relay so you can see functionality (I added the 'E' label, as it had been omitted from that schematic because it is not used in this circuit):



The pins are also numberd - you may see the numbering on the relay itself.

Here are pin letters, numbers, and function:
A = 86 = coil wire
B = 30 = contact common
C = 85 = 2nd coil wire
D = 87 = contact normally open
E = 87A = contact normally closed

You should hear/feel relay click when +12 volts is applied and removed from across the coil (A and C)

With relay not energized, ohmmeter should show 'open' from B to D, should show a fraction of an ohm from B to E.

With 12 volts applied across coil (A and C), ohmmeter should show 'open' from B to E, should show a fraction of an ohm from B to D.


'98 LXi - Later Concorde gages (black w/ chrome rings)/'99 LX - LHS gages (white) - HIR bulbs
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post #6 of 7 (permalink) Old 07-09-2011, 09:49 AM Thread Starter
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thanks, I'm going to have a look at it today. I'm worried that the relays are fine and my fans are not coming on for another reason. :(
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post #7 of 7 (permalink) Old 07-09-2011, 11:02 AM
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Stop worrying. The fans are probably bad, but it's nothing to worry over. Just fix it and keep going...
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