2003 CRDI. Why does heater light turn on, then blink and turn off?

HEATING AND AIR CONDITIONING
HONDA CIVIC 2001 - 2005
How to retrieve DTC:
The heater control panel has self-diagnosis function. To run the self-diagnosis function, do the following:
1.Turn the blower fan OFF.
2.Press and hold the recirculation control switch and the rear window defogger switch down.
3.Turn the ignition switch ON (ll).
4.Release both switches. The recirculation indicator and the rear window defogger indicators come on. The recirculation indicator goes off 3 seconds later and the A/C indicator comes on, then the self-diagnosis will begin. About 10 seconds later, the self-diagnosis will finish and the A/C indicator goes off.
- If any trouble is found, the recirculation indicator blinks the diagnostic trouble code (DTC) to indicate a faulty circuit or component.
- If the system is ok, the recirculation indicator stays off.

DTC TROUBLESHOOTING INDEX
DTC (Recirculation indication blinks) Detection Item Page
7An open in the air mix control motor circuit.21 - 16
8A short in the air mix control motor circuit.21 - 16
9A problem in the air mix control linkage, door, or motor.21 - 17
10An open or short in the mode control motor circuit.21 - 18
11A problem in the mode control linkage, doors, or motor.21 -19
12A problem in the blower motor circuit.21 - 20
13A problem in the EEPROM in the heater control panel;
(THE CONTROL PANEL MUST BE REPLACED).21 - 38
14An open in the evaporator temperature sensor circuit.21 - 23
15A short in the evaporator temperature sensor circuit.21 - 24
- In case of multiple problems, the recirculation indicator will indicate only the DTC with the least number of blinks.
- In case of an intermittent failure, the heater control panel will store the DTC until the ignition is turned off.

O/D blinking indicates that there is low transmission fluid in the system ABS light comes on when there is a problem with the ABS system, most times the tooth ring has broken

This is the multifunction control module. Whne you look at the fuse box, you are really looking at a computer ie... the multifunction cotrol module. Everything goes thru this, except the ECM.

Looks like the TDM/BCM in the security system (VATS/PassKey) is having problems, it's typical on those cars and it can get worse till the car wont start anymore. You can find a great write-up here: http://newrockies.ca , it was the only thing that saved my Park Avenue.

check the socket the bulb goes into

When your battery light comes on while your car is running, it indicates that your charging system has stopped functioning (as least while the light is on). It is recommended that if that happens, you should immediately turn off any electrical loads (AC, heater, wipers, radio, etc.) that you can do without, and get to a place where your charging system can be checked. The engine will not run for very long with the battery not getting a charge.
Hope this helps you understand the problem.

Hi,

The 'S' light is also your diagnostic indicator....so, the answer lies in the 'sequence' which the S light blinks.

Codes:

Long blinks: 1st digit
short blinks: 2nd digit

e.g.1 - if there are 6 short blinks (followed by long pause) then repeats 6 blinks again, the code = 6.

e.g.2 - if there is 1 long blink, then 4 short blinks (followed by long pause) then repeats again, the code = 14.

The ECU may show more more than one code.

Once you determine the correct code/s, post them here so someone can assist you further.

Cheers,

Need to check for computer codes to be sure. A common problem is when accellerating up an incline, the fuel system can run too lean causing a temporay code to set and by easing off the gas pedal the light should stop after a minute or so

It is normal for the system to go through a self test. As long as you check your pressures by hand once a month and the light does not stay on continuously

you may have an air mix motor problem or a mode control motor problem. there is a test you can do that may help: 1. turn the ignition switch on. 2. turn the fan switch off. 3. press the recirc control button to select recirc (recirc indicator light comes on.) 4. press and hold the recirc button to select fresh (recirc indicator goes off). Continue to hold the the button down until the recirc indicator comes on for two seconds and then goes off. If the system is okay, the recirc indicator will stay off. If there is a problem, the recirc indicator blinks a code to indicate a fault. 1 blink=air mix control motor/circuit fault. 2 blinks= mode control motor/circuit fault. 3 blinks= evaporator temp sensor circuit fault. In case of multiple problems, the recirc indicator will only blink the code with the least number. write back if this test shows a code and we'll go from there.