The shift display number is achieved by a combination of grounds (0 volts) and open circuits (Z) on each of 3 wires feeding the gear display. In fact you can disconnect the connector and put grounds in various combinations to prove the display is OK. Conversely you can check the connector wires going back to the shift switch with an ohmeter, to make sure you get the right ground combinations in each shift. There is a 4th gear switch wire that just indicates neutral and is ground only in Neutral, open circuit in any selected gear. This drives the neutral light and safety interlocks
Here's the truth table where 'Z' = open circuit:
On my diagram, but I never trust colours, A= Yellow/Blue, B= Yellow/Black, C=Yellow/White. Neutral indicator: Brown/Violet.
For wires A, B, C:
Neutral: A=0, B=0, C=0. (Neutral switch wire =0)
1st: A=0, B=0, C=Z. (Neutral switch wire =Z)
2nd: A=0, B=Z, C=0. "
3rd: A=0, B=Z, C=Z. "
4th: A=Z, B=0, C=0. "
5th: A=Z, B=0, C=Z. "
6th: A=Z, B=Z, C=0. "
Your fault looks like a permanent ground short on wires B&C. Open circuit wiring through loose connections, would not produce your diplay readings.
Either the display is faulty, the wiring to the switch has been crushed, or the gear selector switch is faulty.
I'd have your dealer look at it, sounds like a simple wiring problem but might be expensive. Good Luck.
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