Oldsmobile Questions? Ask a Mechanic for Answers ASAP
Go to the back of the vehicle right near the muffler. There are three plugs one on the back of the tail housing and one on each side of the unit. Verify the speed sensor circuits are connected to the proper Vehicle Speed Sensor. Connect the harness, with the Yellow and the Purple wire, to the sensor for the front shaft speed sensor. Connect the harness with the Dark Green and the Light Blue wire to the sensor on the rear shaft speed sensor on the passenger side of the transfer case. Connect the harness with the Purple/White and the Light Green/Black wire to the sensor on the rear shaft speed sensor on the driver side of the transfer case. If the wires are all good you will need to get a scan tool to verify every sensor is good. If not you will just be throwing un needed parts at the vehicle. Many times the sensor wires will get dirty and worn so if you find a cracked or broken wire repair. I would disconnect each sensor inspect for damage and reconnect. Like I said if all of those check out you need a scan tool to verify what sensor is bad if they are all good the transfer case control module is at fault which is behind the right hand side kick panel in the vehicle. Check for TCCM codes with another scan tool brand, such as a Tech 2 or MasterTech. Disconnect the TCCM connectors, check for water/corrosion.Test TCCM power/grounds.
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