2002 batery discharges, self locks af...

2002 batery discharges, self locks after unlocking with key fob

Posted in the Toyota Highlander Forum


Brookfield, WI

#1 Nov 15, 2008
I have a 2002 Highlander V6 with original equipment, 105,000 miles. Recently the batery has been discharging overnight, No indications are visible in the car on a faulty charging system. After unlocking with the key fob, it relocks it's self after :30 seconds. This may or may not have anything to do with a charging problem. After charging the battery, the car starts normally and no other warnings or annunciators are on. Overnight the battery drains.

Any thaughts?

United States

#2 Nov 28, 2008
Sounds like your 7-year-old battery is due for replacement.
The automatic re-locking of the doors is normal - should be in the owner's manual.

Tomball, TX

#3 Dec 14, 2008
02 Toyota highlander alarm goes off and drains the battery. Has anyone had this problem?

United States

#4 Dec 8, 2011
Stevel wrote:
02 Toyota highlander alarm goes off and drains the battery. Has anyone had this problem?
I have that problem with my 07. I've taken it into the dealer twice within the last year, and each time they've told me it was a faulty battery, and each time I've told them I didn't think so. The alarm went off when I unlocked the car (with key fob) and wouldn't recognize the key. The alarm kept going...so yeah, then the battery drained. Personally, I think the dealer is just waiting until it's out of warranty to really look into it, then charge me an arm and a leg to do so. They say the alarm goes off because the battery is low, I have to wonder why an almost brand new battery is low (again). I drive a minimum of 44 miles each week day, and close to the same at least one day during the weekend, so surely it would recharge. I wish someone would have some ideas...I don't want to have to replace my battery every few months for the life of the car.

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