As I read the K9 service manual & wiring diagram, it has the same electrical connector as K3-K8 but, like K3-K4, only has four leads to the white six pin connector (that I think has a black cover over it). They are B/W, Gr, W/R, and O/W (O/G For E2, E19, or E24). To enter dealer mode, short W/R to B/W.
But buy a switch. You're fooling around with the ECM and a paper clip invites expensive problems. The switch is maybe $20.
Last edited by billv; 09-05-2019 at 10:21 AM.