TEST 2 Check RADIO fuse. OK → Is there back-up power to connectors behind radio? Yes → Proceed to Test 3. No → Inspect and repair back-up power wire harness. Blown ↓ Replace fuse OK → ⊙→OK Blown again ↓ Check for short circuit in back-up power source wire harness. OK → Replace radio. Short ↓ Inspect and repair wire harness for back-up power source. HINT: Back-up power refers to the storage voltage for preset tuning. This is applied even when the ignition switch is OFF. TEST 3 Check that antenna plug is secure in radio. OK → Replace plug. Okay? OK → Inspect antenna plug No → Does radio alone work? Yes → Replace tape player. No ↓ Proceed to Test 4. Loose ↓ Insert properly. ↓ ⊙ ↓ OK TEST 4 Temporarily install another antenna. Okay? OK → Inspect antenna and antenna cable, and replace as necessary. No ↓ Replace radio. HINT: Since the diversity antenna consists of the pale and window antenna, be certain to check both.