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RHA888H Multiplex Communication Circuit DIAGNOSTIC PROCEDURE 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. RHA889HA Continuity should exist. If OK, check harness for short. OK or NG OK E GO TO 2. NG E 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? RHA890HA Yes or No Yes E GO TO 3. No E 1. Replace auto amp. Confirm that A/C system is in good order. GI MA EM LC EC FE AT PD FA RA BR ST RS BT EL IDX TROUBLE DIAGNOSES HA-89 |