I would tend to doubt they would put retainers in the schematic. I took a look at a few other schematics and depending on what the circuit does seems to determine if it is a twisted pair or not. The wheel speed sensors have the same symbol and a few of the audio circuits have shielded twisted pairs to reduce electric noise or EMI. Also, I am not sure about the VSS wiring but on most of the wheel speed sensors they use low resistance wire. The core of the wire is very fine compared to the wire used in the rest of the car. Not sure if they use the same wire but its just something to look for.
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