This is a tough one just because the two are unrelated when it comes to starting. If I had your car at my shop, I would start by taking the plastic trim off the steering column and checking to see if something is loose in the wiring. I say this because the multi function switch and the ignition switch are near each other. Moving the switch a specific way may be moving something.
Here is what to try. I am going to supply the directions for replacement of the ignition switch. I am not saying to replace it, but rather the directions will show you what needs removed on the column to access wiring. Remove these things and once you locate the switch wiring, turn the key to start and try moving the wiring around to see if you can get it to start. There may be something loose.
Here are the directions. Let me know what happens when you try this. Also, the attached pics correlate with the directions.
2007 Toyota Yaris L4-1.5L (1NZ-FE)
Removal and Replacement
Vehicle Starting and Charging Sensors and Switches - Starting and Charging Ignition Switch Service and Repair Removal and Replacement
REMOVAL AND REPLACEMENT
1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
2. REMOVE STEERING COLUMN COVER
a. Turn the steering wheel to the right and remove the screw indicated in the illustration.
b. Turn the steering wheel to the left and remove the screw indicated in the illustration.
c. Remove the screw indicated in the illustration and remove the steering column cover.
3. REMOVE IGNITION OR STARTER SWITCH ASSEMBLY
a. Disconnect the connector.
B. Disengage the 2 claws and remove the ignition or starter switch assembly.
1. INSTALL IGNITION OR STARTER SWITCH ASSEMBLY
a. Engage the 2 claws and install the ignition or starter switch assembly.
B. Connect the connector.
2. INSTALL STEERING COLUMN COVER
a. Install the screw indicated in the illustration.
b. Turn the steering wheel to the left and install the screw indicated in the illustration.
c. Turn the steering wheel to the right, and install the screw indicated in the illustration.
3. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL
Torque: 5.4 N.M (55 kgf. Cm, 48 in. Lbf)
Try this so we can eliminate the idea that there is a loose or damaged connection.
Let me know what you find.
Images (Click to make bigger)
Thursday, April 9th, 2020 AT 5:22 PM