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Bbecause there is a fault in the climate control system, or you just changed the battery or let it go dead in wich case you need to have it recalibrated
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WHEN I START MY MERCEDES C- 180 MODEL 1997 YHE SRC LIGHT REMAIN ON AND THE AIR BAG LIGHT DOES NOT COME ON , HOW EVER IF I USE DIPPER OR WIPER BOTH DOES NOT WORK INSTEAD THESR LIGHT FLIERS WHEN WIPER LEVER IS PLACED ON OR THE LIGHT GOES OF TILL THE TIME DIPPER SWITCH IS PRESSED
push
and hold in the rear wiper and rear washer butts for 5sec or until all
lights flash but make sure your motor is warm and that the ac is on
high first.. wait until all lights except for the rear wiper light are
off then press the rear wiper button once more..
What has most likely happened is that the Heater-a/c unit needs to be recalibrated and here are the steps to do so.
With the engine running and fully warmed up, A/C has to be turned off for at least 5 minutes [don't turn it on at all] and transmission in Park do the following
1. Set the temp control all the way to cold
2. Set the mode selector to Vent so air blows out of the dash panel outlets.
3. Hold down the rear washer button and the rear wiper buttons simultaineously for about 5 seconds until most all of the heater and ac panel lights blink and then release both buttons
6. At this point the system should go into a self calibration test which can take up to 60 seconds. While it is calibrating various control panel switch lights will blink as it goes through it's tests.
7. When the system is done calibrating then just the rear wiper light should be flashing and you can exit the test by turning off the vehicle. Wait about 10 seconds and restart the engine and it should be fine. If both the rear wiper and intermittent light are both still flashing after the calibration then there is most likely a problem with the system that will need more diagnosing. I see this fairly often with battery replacements so I think you'll be ok. It sometimes takes a couple of tries to calibrate so don't give up if it doesn't work the first time. Good luck, hope this helps!
TO INITIATE TESTS: 1. Set blower to HIGH 2. Set mode position to PANEL (AC vent air) 3. Open all AC outlets 4. Temp. on full cold 5. Start engine 6. Push WASH and REAR WIPER switches for 5 seconds until all panel lights are on solid System will then go through it's paces as it calibrates the climate controls 7. When calibration is complete only the REAR WIPER switch/light should be flashing. Press this switch to extinguish the light This will stops blinking lights.....
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.
To Calibrate , start and warm engine to normal operating temp. with engine idling turn blower switch to high, turn mode switch to panel, open all outlets, move temp lever to full cold.
press and hold rear wash and rear wiper buttons simultaneously for 5 seconds (untill all leds illuminate.) all leds should light up for 5 seconds, rear wiper and intermittent rear wiper button leds will flash alternatly during calibration... after 60 seconds if only rear wiper button led is flashing, cal. is complete
The procedure for re-setting the HVAC control panel on a 1998 Dodge Grand Caravan follows: With ignition on but not running 1. turn knob to air vents 2. turn fan knob to ON 3. temperature setting on COLD (2X) {I have dual temp controls} 4.
hold top(rear wiper) and bottom (rear wiper with wash) buttons pressing
down together until all the buttons cycle through (this will require 1
to 2 minutes of continuous pressing) I learned this from a very helpful local Dodge service adviser
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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