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Old 07-30-2005, 08:31 PM   #1
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Default Brake Shift Interlock Solenoid

I have a 95 Bonneville SE. When it gets cold in the winter I can shift the car out of park. After the car warms up, it shifts ok. I'm thinking that maybe that brake shift interlock solenoid is causing my problems and was hoping to unhook the cable from the brake interlock to the transmission linkage (automatic, center console). I opened up the console and see where the cable attaches but don't know how to disconnect it and don't want to break the plastic clip on the end of the cable. Does anyone know either:

1) how to take the shift interloc cable off the transmission shift linkage, or
2) how to disable the brake shift interlock (where is it located in the car?)
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Old 07-30-2005, 08:42 PM   #2
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Before disabling it, check the brake switch. They can stick in the off position and cause this problem. There may be two switches at the brake pedal so check them both.
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Old 07-31-2005, 08:35 AM   #3
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I helped design the BSI. You can simply disconnect it and the system thinks it'* not there. You will be able to get the car out of park without hitting the brake tho. This could be a safety problem for you. Also the solnoid senses the tail lights so it could be something to do with the brake switch. Good luck
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Old 07-31-2005, 11:16 AM   #4
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Default BTSI

I finally took the center console apart and had better access to the brake shift interlock cable and was able to remove it from the shifter linkage. I had to put the key into the ignition, and push down on the brake pedal which gave me extra slack to remove the plastic clip on the end of the cable from the shifter linkage. All works well now and I expect this to work fine in the winter as well.
I found out that the BTSI (Brake Transmission Shift Interlock) switch is located above and in front of the brake pedal (behind the dash). However, this is an electrical switch and I'm pretty sure this is working fine. Somehow the electrical connection must go to a solenoid which then releases the tension on the cable after the brake pedal is pushed in. I suspect that this solenoid needs to be replaced or the cable itself since everything works fine in warm weather but not in cold weather. In any event, since i disconnected the cable it'll work ok but I'd prefer to fix the real problem and re-enable the BTSI. Does anyone know where the BTSI solenoid is located or where the cable originates?
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