You won't get a spark "turning on" the module up or down. Spark for up likely the HL bulbs... Yellow wire is Power for HL Bulbs too. They draw a lot of power.
The module likely have problem or a loose/bad connection on white wire.
Next is either:
●
Carefully pull up soft plastic seal on 5 pin connector at the module. Leave the plug alone and plug in. May need to pull or cut black plastic "tape" to have slack to pop out the seal.
● Alternate is "back probe" the white wire. 1. find a large sewing pin. 2. make sure you get 0 Ω on the pin. Many are "painted" or otherwise won't work. 3. Carefully push pin next to white wire (Wire Holes in the Soft seal will should move to allow pin to move w/o making a new hole.) and carefully move the tip as needed until you have "12v."
Again Check for "12v" on white wire. (Jump the switch socket or make sure switch works for down wire.)
Have power there?
Then carefully pull push or wiggle the plug.
If motors try to move or completely move down, Pin(s) likely have solder cracks to the module board.
The pins often have cracks there because of iffy manufacturing. If happens, can be fix but not w/ crap or other small tools most have.
Small/cheap irons, < 25w, often will make more problems heating large pins and "lift" the copper of the board overheating that.
E2A--->Other big pins likely have solder cracks too but may not be very obvious. If I rework a large pin then I do all big pins before testing. In this case the 4 for motors and the 5 for power side.
If board has other problems see cave notes to repair... most repairs are Not a good idea beyond fixing crack joints.
[This message has been edited by theogre (edited 04-19-2021).]