Impala security system

New battery, alt good, new ignition switch,but security light still flashes,battery light flashes,and gauges go up and down

First check alt At The Back of Alt Big Red Wire Were hooks to Post (stud) Do you have voltage ?? How Much??

What Voltage do you have at same Place with Engine Running ??

Now At wires Were they plug into Alt ,Top. Wires in White Plastic Clip, Do You Have Powe With Key On ?? How Much Voltage??

Jump across the 2 in the clip (with Engine Running)ONLY TEMPORARY!! Do You Have Voltage at Battery ?? How Much??

If Over 13volts With Clip On (Jumped) You Need A Internal Voltage Regulator ..

Is Batt Light On on Dash ??? Theres A Lot Of Testing You Can Do !!! And I will Need More Infomation to Keep Going ... These are just some Possible Problems No Way In Depth ...

Could Be a Number of things Or May be Just as Simple As a Blown Fuse, Dirty Batt Cables ETC etc etc I Hope It Puts You On The Right track !!!!!!!!!!

After you replace the ignition switch turn the key to start the car and release leave the key were it stops after trying to start wait 10 minutes until security light goes out turn key to full off position then repeat the above procedure two more times for a total of three on the 3rd attempt to start car wait for light to go out then turn key to full off positoion wait 10 seconds then try to start car body control module should learn new pass code and the car should start.

Big john, [email protected] Automotive

Body Control Module (BCM) on both counts. Find a shop in your town that specializes in electrical systems to test it. Beware, these can be intermittent problems, so make sure they keep it until the car does what you have observed. Expect to spend about $450 for the replacment. Dealers quoted me between $700 and $1,100 for the same repair. By the way, a new BCM will probably only last you about 12 months.

I have a 2001 Impala. My security light will flash and sometimes the car won't start. My dad told me turn the key to the start position, place your foot on the break, put your car in the last gear it was in (D, R, or N). Then shift all the way back into park. Make sure you shift all the way into park. Take your foot off the break. Then turn ignition back to off. Your car should then start right up. He said the sensor still thinks the car is in D, R, or N although it's in park. So it confuses the system and it doesn't start because it doesn't know which function to do. It pretty much locks up. I'm pos. this will work. My car does it every few months. Hope this helps.

did you try the starter relay.

After changing the battery use a scanner to reset the CPU program as it appears corrupted.

Posted on

More: