RepairPal Certified shops can diagnose and repair your 2008 Toyota FJ Cruiser. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
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Start by checking your fuses. If there are any sparks when you disconnect/reconnect the battery, or if it was connected or jumped incorrectly, you will lose fuses or other electronic components.
If the fuses are all good, check the compressor relay.