Hello,

I wanted to see if anyone has any ideas about the rear fan. The system does turn on but the fan is only receiving 2.13 volts (which is the power going to earth ground, not through the resistor ground, that shows zero). While meter is hooked up you will see the power fluctuate between 1.63 and 2.13 volts. I have swapped relays and checked fuses. I have removed panel to expose fan and vent area and all connections are good. Here is what I have done:

Check Fusable Links
Check Fuses
Swap relays
Check fan- good
Check all conections to fan, resistor, which is not getting voltage.

I have the wiring diagrams.

Any help would be appreciated!

Thank You

 

Does anyone have any ideas? Has anyone ever tested rear air control unit?

 

I believe there is a resistor block on the rear, like on the front. If it reads 0 ohms, it might be bad.

Item# 10 - Blower control module on the unit looks like it is in the housing near the blower motor, about the 4pm position.

BJB - Battery Junction Box - by the battery

CJB - Central Junction Box - passenger footwell/glovebox

I looked the the service manual, there might be some useful info there, too much to post here. PM me with your e-mail address if you want it.

"When the blower is required, the ACCM energizes the coil of the rear blower relay. The energized rear blower relay supplies battery power to the blower motor, which is connected to ground through the blower control module. The speed of the blower is controlled by the blower control module, which regulates the blower motor voltage in response to a Pulse Width Modulated (PWM) signal from the ACCM. To vary the blower motor voltage the ACCM varies the duty cycle of the PWM signal."