The diodes are for the digital inputs going to the MCU. Toyota uses them to "OR" with other (car) signals and to protect against voltage spikes and the reverse-battery scenario. The cathodes go to the car's switches/inputs, and the resistor packs are pull-up resistors for the MCU.
It's not a small signal diode because the "OR" can involve dashboard lights or external relays.
The original part I think is made by Fuji or Panasonic, ERA15 series (ERA1501, 39 is mfgr. week). This is oddball package small 3mm 1A or 1.5A general purpose rectifier diode, 0.6mm leads. A zener would have a "Z" in the part number, per JIS standards.
I would stuff in a 1N4004 or higher voltage part. Because they are bigger 5mm wide parts with slightly fatter leads, the repair is never going to look pretty unless you sharp bend the leads.
If you want a diode in the same original small package, I have only seen them in inverter microwave oven control boards, consumer electronics or other Fujitsu Ten modules.
If the new diode blows, then there could be a short with whatever else connects to other module pins as part of the OR gate function.
An example is interior lights can be on due to the door switches OR the console switch. The door ajar annunciator is only on due to the door switches, so Toyota uses diodes there. Otherwise the door ajar annunciator is lit but you just manually switched on the interior light and your doors are closed.