Air Conditioner Fan

[Ross1]

So my A/C fan is only working intermittently. I search the forums and noticed a correlation between the ignition switch and the A/C fan. Coincidentally, my fan started having this problem "after" I replaced a faulty ignition switch. The symptons are that when I start the car, the lights come on the A/C unit, but will fluctuate between dim and bright. Also, the little snowflake icon does not appear. After driving for a while, the snow flake will appear and the fan will start working. It will keep working until I stop the car.

My durametric will throw the "31 Fresh air blower fault", but it doesn't seem like the actual fan is the problem. Has anybody had a similar problem? I would hate to replace the entire A/C unit, if that isn't the problem.

Ross

[Loren]

Fault code 31 -- Motor of fresh-air blower

Voltage too low

Voltage too high

Voltage too low

Note: Voltage too low means that the measured blower voltage lies below the nominal blower voltage.

1. Check the heating activation relay.

Battery positive voltage must be present at terminal 87 when the ignition is switched on.

2. Unplug connector C from the heating/air-conditioning control.

3. Connect voltmeter to C 14 (positive) and ground.

Switch on ignition.

Display: Battery voltage

4. Push connector C on the heating/air-conditioning control.

5. Connect voltmeter to C 14 (positive) and C 11 (negative).

Maximum blower speed

Display: approx. 12 V

Minimum blower speed

Display: approx. a V

6. Connect voltmeter to C 14 (positive) and C 16 (negative).

Maximum blower speed

Display: approx. 5 V

Minimum blower speed

Display: approx. 9 V

7. Check driver.

Connect voltmeter to positive and pin 3 on driver connector.

Display: Battery voltage

Connect voltmeter to positive and pin 1 on driver connector.

Maximum blower speed

Display: approx. 5 V

Minimum blower speed

Display: approx. 9 V

Connect voltmeter to positive and pin 2 on the driver connector.

Maximum blower speed

Display: approx. 12 V

Minimum blower speed

Display: approx. 0V

8. Check wiring from heating/air-conditioning control to driver for continuity.

9. Check blower motor.

Voltage too high

Note: A higher blower voltage can only be caused by a short to ground on the wires to pins 1 or 2 of the driver.

1. Unplug connector C from the heating/air-conditioning control.

2. Unplug connector from the driver.

3. Connect ohmmeter to C 16 and ground.

Display: infinite ohms

4. Unplug connector from the fan motor.

5. Connect ohmmeter to driver connector pin 2 and ground.

Display: infinite ohms

[Ross1]

Thanks Loren!

[clipod]

Hi Loren,
I just got Fresh air blower fault. It didnt say low or high voltage.

What should I start with?

Also I have another error code

Litronic headlights HBA

current fault codes
1: Engine path left

what does it mean?

Edited October 2, 2013 by clipod

[Loren]

Hi Loren,

I just got Fresh air blower fault. It didnt say low or high voltage.

What should I start with?

Also I have another error code

Litronic headlights HBA

current fault codes

1: Engine path left

what does it mean?

Can you post the actual fault code numbers and what diagnostic tool did you use?

[JFP in PA]

Hi Loren,

I just got Fresh air blower fault. It didnt say low or high voltage.

What should I start with?

Also I have another error code

Litronic headlights HBA

current fault codes

1: Engine path left

what does it mean?

Fault code 1 Motor circuit, left

This fault is stored in the following cases: 1. Short circuit to ground or open circuit in the circuit between control module and servomotor for HBA (High Beam Adjustment), left, terminals 1,2, 3, 4 2. Servomotor for HBA, left, is faulty 3. The control module is faulty

Elimination: Switch off ignition - Pull plug off the control module - Pull plug off the servomotor for HBA - Check for open circuit in the supply leads to the servomotor for HBA, terminals 1, 2, 3, 4 Ohmmeter display: < 5 Ohms - Check for short to B+ in the supply leads to the servomotor for HBA Ohmmeter connected to terminals 1, 2, 3, and 4; measure resistance to ground Ohmmeter display: Infinite Ohms - Check for short circuits between the supply leads.

If no fault is detected in the wires, replace the servomotor for HBA. Also check the plug on the wiring harness side and replace if necessary.

[clipod]

Hi Loren,

I just got Fresh air blower fault. It didnt say low or high voltage.

What should I start with?

Also I have another error code

Litronic headlights HBA

current fault codes

1: Engine path left

what does it mean?

Can you post the actual fault code numbers and what diagnostic tool did you use?

I am using Durametric to retrieve fault code.

"Heating and Air Conditioning: 31 Fresh Air Blower Fault"

It is what it gave me. Nothing more.

[clipod]

Hi Loren,

I just got Fresh air blower fault. It didnt say low or high voltage.

What should I start with?

Also I have another error code

Litronic headlights HBA

current fault codes

1: Engine path left

what does it mean?

Fault code 1 Motor circuit, left

This fault is stored in the following cases: 1. Short circuit to ground or open circuit in the circuit between control module and servomotor for HBA (High Beam Adjustment), left, terminals 1,2, 3, 4 2. Servomotor for HBA, left, is faulty 3. The control module is faulty

Elimination: Switch off ignition - Pull plug off the control module - Pull plug off the servomotor for HBA - Check for open circuit in the supply leads to the servomotor for HBA, terminals 1, 2, 3, 4 Ohmmeter display: < 5 Ohms - Check for short to B+ in the supply leads to the servomotor for HBA Ohmmeter connected to terminals 1, 2, 3, and 4; measure resistance to ground Ohmmeter display: Infinite Ohms - Check for short circuits between the supply leads.

If no fault is detected in the wires, replace the servomotor for HBA. Also check the plug on the wiring harness side and replace if necessary.

I am not an expert in boxster repairs. I did few stuff like maf cleaning, headlamp replacement etc. Do you have any article which provides images on how to work on it. I searched online but couldn't find any. Also can you tell me whats the level of difficulty for this.

[JFP in PA]

Hi Loren,

I just got Fresh air blower fault. It didnt say low or high voltage.

What should I start with?

Also I have another error code

Litronic headlights HBA

current fault codes

1: Engine path left

what does it mean?

Fault code 1 Motor circuit, left

This fault is stored in the following cases: 1. Short circuit to ground or open circuit in the circuit between control module and servomotor for HBA (High Beam Adjustment), left, terminals 1,2, 3, 4 2. Servomotor for HBA, left, is faulty 3. The control module is faulty

Elimination: Switch off ignition - Pull plug off the control module - Pull plug off the servomotor for HBA - Check for open circuit in the supply leads to the servomotor for HBA, terminals 1, 2, 3, 4 Ohmmeter display: < 5 Ohms - Check for short to B+ in the supply leads to the servomotor for HBA Ohmmeter connected to terminals 1, 2, 3, and 4; measure resistance to ground Ohmmeter display: Infinite Ohms - Check for short circuits between the supply leads.

If no fault is detected in the wires, replace the servomotor for HBA. Also check the plug on the wiring harness side and replace if necessary.

I am not an expert in boxster repairs. I did few stuff like maf cleaning, headlamp replacement etc. Do you have any article which provides images on how to work on it. I searched online but couldn't find any. Also can you tell me whats the level of difficulty for this.

I have no diagrams to offer as they are copyrighted materials, but the instructions are straightforward, requiring removal of the headlight assembly (you should have a tool in the car's tool kit for that), and a digital multimeter to test the circuits on the headlight.