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AV COMMUNICATION SIGNAL CIRCUIT AV-261 < DTC/CIRCUIT DIAGNOSIS > [PREMIUM WITH NAVIGATION] C D E F G H I J K L M B A O P 3. CHECK HARNESS - RXD 1. Check continuity between satellite radio tuner (factory installed) harness connector M41 (A) terminal 30 and audio unit harness connector M42 (B) terminal 50. 2. Check continuity between satellite radio tuner (factory installed) harness connector M41 (A) terminal 30 and ground. Are continuity results as specified? YES >> GO TO 4. NO >> Repair harness or connector. 4. CHECK REQ1 SIGNAL 1. Connect satellite radio tuner (factory installed) connector and audio unit connector. 2. Turn ignition switch to ACC 3. Check signal between satellite radio tuner (factory installed) har- ness connector M41 terminal 28 and ground with CONSULT-III or oscilloscope. Are voltage readings as specified? YES >> GO TO 5. NO >> Replace audio unit. Refer to AV-326, "Removal and Installation" . 5. CHECK TXD SIGNAL Check signal between satellite radio tuner (factory installed) harness connector M41 terminal 29 and ground with CONSULT-III or oscillo- scope. A B Continuity Connector Terminal Connector Terminal M41 30 M42 50 Yes A — Continuity Connector Terminal M41 30 Ground No ALNIA0708GB (+) (-) Reference signal Connector Terminal M41 28 Ground WKIA4544E SKIB3825E (+) (-) Reference signal Connector Terminal M41 29 Ground WKIA4545E SKIB3824E |