RepairPal Certified shops can diagnose and repair your 2003 Chevrolet Avalanche 1500. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
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The rear door locks are controlled by separate relays (located in the lower left side of dash fuse box) and the body computer. The body computer sends a ground signal to the lock or unlock relay after the appropriate switch is pressed.