Hello, I have a 2009 HHR. My blower motor does not run at all. I have worked through the electrical diagram for the blower motor.
-Checked the BCM and fuse 4. They are good.
-Checked the relay. Ran power thru the relay, and the conduit snaps over to 87.
-Checked the brown wire with my meter, and it displays the voltage.
-Check continuity from the motor connection to the resistor, then the resistor to the switch.
- Changed the motor. Powered the motor by itself and it ran.

I figured it would at least work on the high speed. Nothing happens. What is the wake-up reference(dark green)? Do I need to activate the system through OBD2???

Please advise.

 

I always check as you did the wire’s, the fuses, the relays and the resistor. I then investigate the hvac control panel, it can malfunction

check for a loose or corroded ground wire

https://www.chevyhhr.net/forums/gene...r-64793/page3/

 

When you checked the brown wire with the meter and found voltage, what did you put the meter ground lead on?

Connect the orange wire to a known good ground and see if the motor runs. If it does then the switch is bad or the switch ground is bad (black wire, circuit #550 in schematic).

Steve

 

The "wake up volt off" is used to tell the HVAC system that you are turning it on (by putting the blower speed switch to anything but off). When the blower speed is set to off, the DK GRN wire is at ground. At any other setting (Low, med, high) the DK GRN is NOT connected to ground and will be pulled up to a high voltage internally in the controller (therefore getting a "wake-up call"). The HVAC controller then commands the temperature and mode doors to their proper position (as selected by the user).

Steve

 

The brown wire reads 12V. I ran a piece of wiring from the orange connection point to a known good ground. Nothing. It doesn't make any sense because it should have run.

 

What was going on just before it stopped?
Did you check continuity from the switch to ground?
The splice at the orange wires?
Continuity in the switch positions?

 

It happens that the fan simply does not receive a signal to start. The onboard brain does not understand that the fan must be used to cool the internal combustion engine.
At the same time, I see from the correspondence that the fan is connected correctly.
Connect the fan to the power supply directly. Just the fan wires to the battery terminals.
If the fan has started working and shows no symptoms of the disease, check the thermostat and sensors.
If the fan doesn't spin, throw it away and buy a new one.

 

I’m not sure we are talking about the cooling fan, but the hvac blower fan.

 

here, damn it ... again I messed up ...
I'm sorry, of course...
But if in fact - I suspect that the motor itself could jam due to old age or dirt. It seems to be connected correctly, why not earn it? Either the fan itself is dead, or the command to turn on does not come.

 

Geg, I just wanted to clarify, no worries 😉