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TROUBLE DIAGNOSIS ATC-63 C D E F G H I K L M A B ATC 1. CHECK POWER SUPPLY CIRCUIT FOR DISPLAY AND A/C AUTO AMP. 1. Disconnect display and A/C auto amp. connector. 2. Check voltage between display and A/C auto amp. harness con- OK or NG OK >> GO TO 2. NG >> Check 10A fuses [Nos. 6, 12 and 19, located in the fuse block (J/B)]. Refer to ● If fuses are OK, check harness for open circuit. Repair or replace if necessary. ● If fuses are NG, check harness for short circuit and replace fuse. 2. CHECK GROUND CIRCUIT FOR DISPLAY AND A/C AUTO AMP. 1. Turn ignition switch OFF. 2. Check continuity between display and A/C auto amp. harness OK or NG OK >> Replace display and A/C auto amp. NG >> Repair harness or connector. Terminals Ignition switch position (+) ( − ) OFF ACC ON Display and A/C auto amp. Terminal No. M31 2 Ground Approx. 0 V Approx. 0 V Battery M31 3 Battery Battery Battery M31 23 Approx. 0 V Battery Battery RJIA3499E 5 – Ground : Continuity should exist. RJIA3500E |