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Antitheft locks out when temp outside -20

. I have a 2004 impala and live in Manitoba. For the past 2 yrs when it gets below -20 my antitheft prevents the car from starting. I put in an interior car warmer which has solved the problem BUT I just wondered if anyone knows what is causing this issue?
Thanks in advance.
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post #2 of (permalink) Old 05-04-2019
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Quote:
Originally Posted by dusti57 View Post
. I have a 2004 impala and live in Manitoba. For the past 2 yrs when it gets below -20 my antitheft prevents the car from starting. I put in an interior car warmer which has solved the problem BUT I just wondered if anyone knows what is causing this issue?
Thanks in advance.
When you say antitheft, are you getting the SECURITY message on the right side of the instrument cluster? And the car won't crank?

There was a TSB that pertained to a SECURITY issue. It instructed the technician to clean the contacts on the BCM connectors for the wires going to the ignition switch where the key detection sensor is. (I think that's a Hall effect sensor.)

Apparently a little bit of galvanic corrosion causes the path resistance in the wire to change just enough to throw off the reading and make the BCM think there's no key in the ignition and hence it won't allow cranking.

To clean the connector contacts, start with disconnecting the battery. Then remove and re-insert each connector into the BCM several times. There are three connectors. You pinch the levers on them like a clothes-pin and then pull.

The BCM is located above the driver's left foot. IIRC, you'll need to remove a black trim piece to get to it.

Temperature will also affect resistance. I'm thinking between having a little bit of corrosion and the cold temp, the resistance can go up just enough to cause the no-start condition.

Give that a try and let us know if it helps.

HTH.

Doug

.

_

If your socket set is all the same brand, you might be a city slicker.

.
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