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Ac and rear defrost lights are blinking

Ac and rear defrost light will come on at the same time. The ac light will blink 3 times then both lights will go off. Then it waits 10 seconds and start again. I think it is in some kind of code mode but I want to know what it is before going to the dealer. Thanks!

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6ya6ya
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Posted on Jan 02, 2017

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fossilruins
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SOURCE: engine light fr ash 10 time

what your check engine light is doing is called the key dance.

The "Key Dance" is a coined term to identify a process of reading MIL fault codes stored by your cars engine computer (PCM). You cycle your ignition key from off to on (not start) 3 times leaving it on. You then count the number of times the Service Engine Soon light flashes. This combination of flashes identifies a fault code. For example, a code 21 would be flash, flash, pause, flash. All codes are 2 digits. Multiple codes are seperated by longer pauses. It should end with a code 55 indicating the process is finished.

Sometimes in newer models, the code is shown on the trip odometer. They would be P codes.

I would pull out my obd code reader and find out what it's telling me. Some parts places (Autozone, O'Reilys, etc) would even have a code reader you could borrow to check for any obd codes.

Posted on Jun 21, 2008

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  • 1 Answer

SOURCE: flashing lights

Hi, had the same problem today. Solution: Start engine, blower on max, air direction to cabin, press rear wiper and rear wash buttons simulanteously for 5 seconds (all lights now on steady). Calibration test starts and lights flsh alternately. After first test, AC and recurculation lights flash for the cool down test. If all test pass then rear wiper light blinks slowly (press to exit self test). If AC and recurculation test fails then just 2 lights stay on. To repeat this part of the test press just AC and rear wash simulanteously ( may take several attempts and usually best when engine is cold). Again exit by pressing the rear wiper button once it is the only one flashing (slow blink).

This does work but it took me 15 minutes to finally switch them off!!!

Posted on Mar 12, 2009

  • 148 Answers

SOURCE: Service Tire Soon @ 2004 Pacifica

dont have it disconnected make them fix the problem the computer needs to be reprogramed

Posted on Jul 14, 2009

Danniboi
  • 1098 Answers

SOURCE: hi my battery whet dead n the mrs put in the wrong

Hi Gary

Ther power will need to be on for 2hrs, that is the radio will need to be turned on for 2 hours with the ignition on. If you have done this already then the radio will need re-coding, this sometimes happens. You dont have to go to a dealer there is independant decoders around. let me know if you cant find pne.

Regards
Dan

Posted on Feb 28, 2010

Testimonial: "thanks for the quick response will do it right now...........gary"

csmock132
  • 4669 Answers

SOURCE: How can i check the code for the check engine

Turn the ignition switch on off on off on off on. After the third time the check engine light should start blinking codes. It will start with 12. That is the start of codes code. It will end with 55. That is the end of codes code. You just want to know what codes are inbetween 12 and 55

Posted on Apr 08, 2010

Testimonial: "Thank you for your help, it was an o2 sensor that was my problem. I REALLY appreciate your response. "

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it is needing to be calibrated because of dead battery.i cant remember for sure but i think you had to push rear wiper and recirc buttons at the same time and hold them down a couple of seconds. engine has to be running and at normal operating temp. lights will flash and vents will change heat to cold etc. if it fails any test the lights will just keep blinking untill repaired and recalibrated.

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The blinking lights in the rear wiper rear defrost area can be reset by holding 2 buttons of the 3 on the left hand side. The top and bottom buttons. Turn the key on and hold them for about 10 sec and they should start flashing differently. Just let it do this. After they start flashing different. It will take 5 to 10 mins. Then one or more will quit flashing all together. If they don't after about 20 min reset them again it can take about 5 trys sometimes before they all go out.

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Hi there,

TO INITIATE TESTS:
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Thanks

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With my 1998 TC you have to start car turn to cold and fan on high. Tehn hold down the rear wiper and WASH buttons until the lights start flashing differently. Let it run through until only the rear wiper light is blinking. You should here it cycling through the different functions. When it is jsut the rear wiper blink press that button and the system is reset if there are no problems. A low voltafge problem had caused mine to act up.

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The procedure for re-setting the HVAC control panel on a 1998 Dodge Grand Caravan follows:
With ignition on but not running
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2. turn fan knob to ON
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Hi, had the same problem today. Solution: Start engine, blower on max, air direction to cabin, press rear wiper and rear wash buttons simulanteously for 5 seconds (all lights now on steady). Calibration test starts and lights flsh alternately. After first test, AC and recurculation lights flash for the cool down test. If all test pass then rear wiper light blinks slowly (press to exit self test). If AC and recurculation test fails then just 2 lights stay on. To repeat this part of the test press just AC and rear wash simulanteously ( may take several attempts and usually best when engine is cold). Again exit by pressing the rear wiper button once it is the only one flashing (slow blink).

This does work but it took me 15 minutes to finally switch them off!!!

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