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Two questions Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Sun, 11 Dec 2005 18:29:41
In Reply to: Perplexing seat heat problem, hanesj75, Sun, 11 Dec 2005 10:20:21 Members do not see ads below this line. - Help Keep This Site Online - Signup |
First, did you get 12 volts at the connector under the seat (fat yellow wire, pin 2) when the connector from the seat was connected in? Or did you disconnect the male connector (the one that goes to the seat) and measure 12 volts at the connector on the bulkhead? (That's still one question).
Second - have you checked the ground return?
The 1.6 ohms for the seat heater element is right on. The 1-2K for the thermostat depends on the temperature of the seat. So that sounds right.
It'll be tricky to do, but try this - with the connector going to the seat connected up, use your voltmeter to measure voltage from the yellow wire on the connector to ground. It should be 12 volts (or more like 13 - the car is running) when the relay clicks on. If you see substantially less than 12 volts, like only 2 or 3 volts, then the contacts on the relay are dirty and need to be cleaned.
If you see 12 volts, then use your voltmeter to measure the voltage on the ground return (black wire, pin 5) to ground. With the seat on, it should be no more than about 0.1 volts. If it is more than 0.1 volts, then the ground is bad. Remember, it takes a good ground for that current to flow. and the seat to heat up.
If the relay contacts are dirty, you'll see 12 volts with no load. The meter pulls no current. But the contacts have resistance when dirty, and when you connect up the load (seat), even a very small resistance 1 or 2 ohms will cause enough of a voltage drop that the seat won't get warm. And that resistance only shows up when current flows through the contacts, so the best measurement is done with the seat heater in the circuit. The same is true if the ground return is poor.
posted by 12.76.155...
, Sun, 11 Dec 2005 18:29:41 <-- Viewing This Message
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