HVAC Blower Motor not working on any setting

[Joneser2002TT]

So you swapped a used E87 and you still did not have high blower speed?

Correct. Nice Camaro, took my driver's test in a red '73.

 

[MVB_]

Have you put a test light on C11(ground) and battery + and turned blower to high speed to see if light will come on at full brightness.

 

[Dr Sheldon]

So after doing some reading, it actually is a resistor.

Your reading is wrong ! That thinking is the REAL reason behind you being unable to solve a very simple Fan Blower fault !!

A resistor pack is NOT the same as a PWM Motor Controller. !!

Yes they both have a heat sink for OBVIOUS reasons !!

 

[Dr Sheldon]

So clearly there is a signal coming from the green/black wire from the ACCH that varies the continuity between the brown ground wire (chassis) and the brown/red wire that goes to the blower motor.

That is not correct !!

That is not how it controls the Fan Speed !! Clearly Not !

 

[PetrolDave]

So you swapped a used E87 and you still did not have high blower speed?

Since the resistor is not in series on high speed that kinda eliminates the E87 as the problem

 

[MVB_]

Since the resistor is not in series on high speed that kinda eliminates the E87 as the problem

Couldn't the used replacement be bad? Not have ground where it should.

J126 low speeds (1-3) different pin location on hvac module and high speed direct on another pin location. Op stated as I recall no low or high speed.

 

[PetrolDave]

Couldn't the used replacement be bad? Not have ground where it should.

IF it's just a resistor then that just incrementally steps in series with the motor to produce lower speeds, no ground needed.

 

[MVB_]

IF it's just a resistor then that just incrementally steps in series with the motor to produce lower speeds, no ground needed.

Are we looking at the same WD posted in #11 which I believe Op confirmed that is what Op has. So it has a constant 12v+ to motor with car on except when 75 /X turns it off.

 

[PetrolDave]

Are we looking at the same WD posted in #11 which I believe Op confirmed that is what Op has. So it has a constant 12v+ to motor with car on except when 75 /X turns it off.

OK, I assumed the motor was grounded and the resistor in the 12V side.

 

[Ziddywerks]

With motor speed set to max resistor pack is bypassed completely from what I remember. straight 12v to motor.

 

[MVB_]

OK, I assumed the motor was grounded and the resistor in the 12V side.

You had me questioning if I was reading that WD correctly or was not seeing something I should have.

 

[Dr Sheldon]

OK, I assumed the motor was grounded and the resistor in the 12V side.

With motor speed set to max resistor pack is bypassed completely from what I remember. straight 12v to motor.

Op confirms that the wiring Diagram in Post #11 is correct for his car.

In that case this is Auto Climate and does Not have a resistor pack to control blower motor speed.


It has a PWM Controller. It has 75x Live - Live when Ignition on and With Engine Running - Dead Whilst T50 is active. It is Negative side Switched / modulated. Simple Childs Play !

 

[MVB_]

OK so what is causing high speed not to work if motor plug is seeing 12v+ on the blower connector plug? Speeds 1-3 are J126 4 speed is direct from hvac module.

 

[Joneser2002TT]

So you swapped a used E87 and you still did not have high blower speed?

Yes, that's correct

 

[MVB_]

Yes, that's correct

Yes you stated already

Post #33 was more to the Doc childs play to fix

 

[Joneser2002TT]

Op confirms that the wiring Diagram in Post #11 is correct for his car.

In that case this is Auto Climate and does Not have a resistor pack to control blower motor speed.


It has a PWM Controller. It has 75x Live - Live when Ignition on and With Engine Running - Dead Whilst T50 is active. It is Negative side Switched / modulated. Simple Childs Play !

75x is live without engine running (verified) so that must mean T50 is not active. What is T50? Do you mean the ECM?

 

[Dr Sheldon]

75x is live without engine running (verified) so that must mean T50 is not active. What is T50? Do you mean the ECM?

No - I meant exactly what I wrote !!

It has 75x Live - Live when Ignition on and With Engine Running - Dead Whilst T50 is active. It is Negative side Switched / modulated. Simple Childs Play !

 

[Dr Sheldon]

I am thinking this is beyond you.

Perhaps consider passing on to a (wo)man that can ?

 

[Dr Sheldon]

IF it's just a resistor then that just incrementally steps in series with the motor to produce lower speeds, no ground needed.

Assuming would then be like not insisting on an Autoscan for each post ?? Just assume hey ?

 

[Dr Sheldon]

OK, I assumed the motor was grounded and the resistor in the 12V side.

Assuming would then be like not insisting on an Autoscan for each post ?? Just assume hey ?