Rear door actuator for heater

SYKES.WILL

MEMBER
2008 TOYOTA SIENNA
6 CYL
2WD
AUTOMATIC
130,000 MILES

I just replaced the rear door actuator for the rear heat would not work while the front heat would. Once replaced, the actuator is not working. Is there a step that I am missing?

Saturday, October 20th, 2018 AT 10:48 AM

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
43,262 POSTS

Sometimes the new part will need to be initialized but lets try resetting the system with a hard reboot. Remove the negative battery cable and hold it to the positive battery terminal which will discharge the system capacitors and allow the system to reboot and helpfully self initialize inself. Please let us know what happens.

SPONSORED LINKS

Was this

answer

helpful?

Yes

No

Monday, October 22nd, 2018 AT 12:14 PM

SYKES.WILL

MEMBER
2 POSTS

I tried this and it did not work. In fact, the temperature will not read on the van now and none of the switches will work or dials will work for switching to rear air or defrost etc. Seems like the main controller is out as well.

Was this

answer

helpful?

Yes

No

Wednesday, October 24th, 2018 AT 9:49 AM

KEN L

MASTER CERTIFIED MECHANIC
43,262 POSTS

All this started when you replace the actuator can I ask if it is an OEM (factory) part? Here are the HVAC wiring diagrams and fuse locations so we can see how the system works and let's check the HTR, ECU/ACC fuses to see if we had a voltage surge when connecting the battery.

Here is a guide to help us check for power at the fuses.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the diagrams (Below). Please let us know what happens.

Images (Click to make bigger)