How to convert Manual A/C to Auto A/C
OE Parts required:
1x Auto A/C controller
1x Auto A/C radio bezel
1x Interior Temperature Sensor (OE PN: 972702M000)
1x Auto A/C climate sensor (OE PN: 97253-2M100)
You do not require a different display unit. The purpose of the CAN connections is to allow the IDD to receive the correct information inorder to display the state of the climate control.
Start by removing your shifter bezel, followed by your radio bezel
Removal of the IDD bezels is required too, using a trim panel removal tool use a similar method as outline for removing the center stack, pulling the trim away from the crash pad. There are no screws, only clips holding it in.
Next remove the trim panel below the steering wheel that is connected to the crash pad assembly.
Know what parts you're dealing with;
Auto A/C Connector (B)
I highly recommend soldering directly to the pins if you cannot source a factory connector.
in order to make the part removable, making your own harness and using generic connectors from somewhere like Pico is a good idea and what I chose to do.
What goes where on the connector B.
Locate Pin 13 (Body K-line) on the Data Link or OBD-II port under the edge of the dash.
Connect Pin 13 to Pin 6 on the Auto A/C connector (B).
Locate and tap into Pin 7 (CAN-) and 8 (CAN+) on the IDD harness.
Connect Pin 7 to Pin 14 and Pin 8 to Pin 15 on Connector (B) of the Auto A/C unit.
Locate and tap into Pin 1 (speed) and Pin 5 (Ext. Temp) on Connector (A) of the audio unit.
Connect Pin 1 to Pin 4 and Pin 5 to Pin 5 on Connector (B)of the Auto A/C unit.
Locate and connect Pins 1 (Photo Sensor -) and 2 (Photo Sensor +) on the Auto Light & Photo sensor, the new one, not your existing one.
Connect Pin 1 to Pin 10 and Pin 2 to Pin 9 on Connector (B) of the Auto A/C unit.
To remove the existing photo sensor, simply use a trim panel removal tool and lift up on the side facing the rear of the car, it will release two clips and then you can angle it out. Release the clip on the bottom, careful as there is little factory wire so it won't move far. Feed the two new wires in before connecting the new photo sensor to the factory harness, simplest method is to have them go between the windshield A/C ducts, you'll see them poking through with the IDD bezels out of the way, grab them and feed them down to the A/C harness you should have made.
Locate Pin 28 (water temp sensor) of the EM51 chasis harness behind the passenger side kick panel, connect Pin 28 to Pin 11 on Connector (B) of the Auto A/C unit. If no wire exists at Pin 28, use Pin 2 of the water tempertature sensor located under the hood.
In case you don't have this wire (though you should), use the following image to locate the water temp sensor, use Pin 2, or the middle wire.
Locate Pin 2 (sensor ground) and 4 (sensor signal) of the In Car Temperature Sensor.
Connect Pin 2 to Pin 5 on the M65 connector and connect Pin 4 to Pin 3 on Connector (B) of the Auto A/C unit.
It's best to mount the in car temp sensor in its factory location. This can be achieved with two trim screws, you can get these from a dealership.
Connect Pin 16 of Auto A/C connector B to a suitable ground location such as frame or another known ground wire.
Test the auto climate control unit to ensure operation.
Reinstall all of the panels and trim in reverse of removal.
Install the Auto A/C unit into your replacement radio bezel and reinstall the bezels to the center console.
You're now done.