Having problems with your 1999 Isuzu Trooper ?
Adjsut compass adjust compass
If it's a Donnelly or Gentex try Pressing the compass button until it displays a "C". Do this in a area where you can drive slowly in a circle several times. Like a empty parking lot. That should reset the unit. the owners manual should give you the correct procedure too.
Repair Help & Product Troubleshooting for 1999 Isuzu Trooper
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