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RHA888H Multiplex Communication Circuit DIAGNOSTIC PROCEDURE NBHA0118 SYMPTOM: I A/C system does not come on. I A/C system can not controlled. 1 CHECK CIRCUIT CONTINUITY BETWEEN DISPLAY & NAVI CONTROL UNIT AND AUTO AMP. Check circuit continuity between each terminal on Display & Navigation control unit and on auto amp. RHA889H Continuity should exist. If OK, check harness for short. OK or NG OK © GO TO 2. NG © 1. Repair harness or connector. Confirm that A/C system is in good order. 2 CHECK MULTI-PLEX COMMUNICATION SIGNAL Do approx. 3.5 volts exist between Display & NAVI control unit harness terminal Nos. 37, 38 and body ground? RHA890H Yes or No Yes © GO TO 3. No © 1. Replace auto amp. Confirm that A/C system is in good order. TROUBLE DIAGNOSES Multiplex Communication Circuit HA-142 |