[avityvan]

Replaced blower motor and resistor but still not blowing. Check function controller okay, measure power at resistor 14.75 volts but check at the blower motor is .07 volt.

Need diagnostic help, much appreciate.

[gbalthrop]

Originally Posted by avityvan

Replaced blower motor and resistor but still not blowing. Check function controller okay, measure power at resistor 14.75 volts but check at the blower motor is .07 volt.

Here's the circuit diagram for your Blower Motor & Final Stage Resistor (M30 & N2 in Schematic):
https://www.newtis.info/tisv2/a/en/e...bution/hwh7J2T

Note the Red (12V+ Supply) and Brown (Ground) wires from the resistor to the motor. Have you used jumpers to those two wires (Final Stage DISCONNECTED) to test blower motor?

If blower motor spins per that test and you have 12V+ at Pin #2 of Connector X18722 (Red/Blue wire) AND Continuity to Ground at Pin #1 (Brown wire), then either there is an issue with the Final Stage Resistor, or bad signal from the White/Brown wire at Pin #4.

ANYONE know how to test signal from the IHKA (A11a)? Is that a square wave signal? Can an oscilloscope read that, or even perhaps a DMM on Volts AC? If it were MY car, I would try the latter, with Ignition on, changing MANUAL blower setting while reading AC Volts at Pin #4 in reference to ground.

Note that the signal line from IHKA runs through the JBE, In @ Pin #18, and Out at Pin #23, of Connector X14272. I have seen several reports of bad pins/sockets at that connector causing blower malfunction. Here is the Installation Location:
https://www.newtis.info/tisv2/a/en/e...lim/1VnYoJSPhH

Is your car subject to the Blower Harness Recall? What issues caused you to replace Blower & Final Stage Resistor?

George

[avityvan]

2006 BMW 325i, I don't think my model is on the list for the recall hardness.
Car was park for a few months and I couldn't start, so replaced battery and find out that blower motor fan stop working.

Checked all connector looks good.
Bypass final stage resistor, blower motor spinning okay.
Checked input voltage at the final stage resistor is 14.75V and ground is good, data line read low voltage. What's the voltage at data line when the fan is full on? where is data line is coming from?

Checked output power of final stage resistor is .007V and ground is good.

I thought I have a bad final stage resistor so I bought the second final stage resistor but still not coming on. I can hear the blower start to spin for a second then it shut down.

Could it be something else that cause my blower motor not to turn on.

[gbalthrop]

Originally Posted by avityvan

...I thought I have a bad final stage resistor so I bought the second final stage resistor but still not coming on. I can hear the blower start to spin for a second then it shut down. Could it be something else that cause my blower motor not to turn on.

If you refer back to my previous post, I linked the circuit diagram that shows the CONTROL wire (White/Brown, labeled "PWM_LUE") from the IHKA to the Blower Final Resistor "going through" the JBE. "PWM" stands for Pulse-Width Modulation or square-wave signal that is used for control signal. My SWAG would be that you have damaged, loose or corroded connectors at one of the pins of Connector X14272, Either Pin #18 where the signal comes FROM the IHKA, or Pin #23, where the signal goes OUT to the Final Stage resistor.

That SWAG is rendered MORE likely by your statement that the motor "starts to spin for a second" but then shuts down. Interrupted or intermittent PWM signal is a likely cause of that behavior.

As I mentioned in the prior post, I do NOT know the proper or possible ways to test that signal, whether by Oscilloscope, by AC Voltage, or what, and requested suggestion by someone more knowledgeable in electronics. If it were my vehicle, and since I do NOT have an oscilloscope, I would try using AC voltage on my DMM (Digital Multimeter) to test signal at each of those two pins, in addition to visual examination of those pins.

That JBE Connector is PARTICULARLY likely to be the fault area IF your vehicle has had water leak at the right footwell area, either from windshield or cowl/ microfilter housing leak.

If you can do an INPA or BMW-specific scan for BMW Fault Codes saved in the JBFF (JBE) and IHKA modules, you may well find something saved there which assists in diagnosing the fault. IF you don't have access to such Scan Tool or Software, and don't want to pay a shop for such a scan, I would test as described above.

If you still have questions about the foregoing, please let me know.

George

[smass]

Originally Posted by avityvan

2006 BMW 325i, I don't think my model is on the list for the recall hardness.
Car was park for a few months and I couldn't start, so replaced battery and find out that blower motor fan stop working.

Checked all connector looks good.
Bypass final stage resistor, blower motor spinning okay.
Checked input voltage at the final stage resistor is 14.75V and ground is good, data line read low voltage. What's the voltage at data line when the fan is full on? where is data line is coming from?

Checked output power of final stage resistor is .007V and ground is good.

I thought I have a bad final stage resistor so I bought the second final stage resistor but still not coming on. I can hear the blower start to spin for a second then it shut down.

Could it be something else that cause my blower motor not to turn on.

My 06 is on the recall list. https://www.bmwusa.com/safety-and-emission-recalls.html

[PhaseP]

OP do you have an E90 or E46?

[avityvan]

E90

[avityvan]

Update on blower motor not blowing:

I took my car to the dealer for the blower motor wiring recall work but still blower motor fan not blowing. BMW dealer said is my climate control module is bad, the cost for the repair is $1600+labor.

Anyone know where is the climate control module location?

[PhaseP]

Google IHKA

One example link: https://www.e90post.com/forums/showthread.php?t=1315527

[relative4]

Originally Posted by avityvan

Update on blower motor not blowing:

I took my car to the dealer for the blower motor wiring recall work but still blower motor fan not blowing. BMW dealer said is my climate control module is bad, the cost for the repair is $1600+labor.

Anyone know where is the climate control module location?

Originally Posted by avityvan

BMW dealer said is my climate control module is bad, the cost for the repair is $1600+labor.

Anyone know where is the climate control module location?

Yeah, it's on your dashboard. $30 used on eBay, 2 minutes to swap, no tools required. Maybe a butter knife.
However, since a dealer says it's bad, it's probably fine. Dealers can't diagnose, only overcharge.
Pull the codes.