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Each tire has a module and the receiving unit in the car typically under the dash. To reset it:
1. Park the vehicle in a safe place and turn the ignition switch to the "LOCK" position.
2. Adjust the pressure of all installed tires to the specified cold tire inflation pressure level.
3. Turn the ignition key to the "ON" position.
4. Push and hold the tire pressure warning reset switch until the tire pressure warning light blinks slowly three times.
5. Leave the system with the ignition switch in "ON" position for a few minutes, and then turn the ignition key to the "LOCK" position.
To test relay just replace it with another similar relay with same spade configuration and turn the lights on, normally it's the multi function switch that goes bad, If you try a different relay and the lights don't come on then it is the switch. If you need some more help just answer the e-mail so I can give you more detailed information on testing.
Normally, an burened out brake light fuse will prevent the shifter from coming out of park. A bad brake pedal switch that activates the brake lamps could also cause this issue. A more remote cause would be a shorted out trailer harness, that is causing the brake light fuse to blow.
I had an S-70 with the same problem what happens is the headlight switch tabs that hol it together broke and the switch was slightly separated and connection was not there for the headlights and also check the high beam see if headlights come on i dont think it is a relay or fuse??? proballally the headlight switch and easy to replace you even can use one from an 850 model