Satellite Radio Tuner (Factory Installed) Communication Circuit Inspection

WARNING: This page is about a different car, the 2006 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HARNESS - 1
1. Turn ignition switch OFF.
2. Disconnect satellite radio tuner (factory installed) connector M41 and audio unit connector M42.
3. Check continuity between satellite radio tuner (factory installed) harness connector M41 (A) terminal 28 and audio unit harness connector M42 (B) terminal 48
  Continuity should exist.
4. Check continuity between satellite radio tuner (factory installed) harness connector M41 (A) terminal 28 and ground.
  Continuity should not exist.
OK or NG

OK : GO TO 2.

NG : Repair harness or connector.

Fig 1: Identifying Continuity Between Satellite Radio Tuner (Factory Installed) Harness Connector M41
CHECK HARNESS - 2
1. Check continuity between satellite radio tuner (factory installed) harness connector M41 (A) terminal 29 and audio unit harness connector M42 (B) terminal 49
  Continuity should exist.
2. Check continuity between satellite radio tuner (factory installed) harness connector M41 (A) terminal 29 and ground.
  Continuity should not exist.
OK or NG

OK : GO TO 3.

NG : Repair harness or connector.

Fig 2: Identifying Continuity Between Satellite Radio Tuner (Factory Installed) Harness Connector M41 (A) Terminal 29 And Ground
CHECK HARNESS - 3
1. Check continuity between satellite radio tuner (factory installed) harness connector M41 (A) terminal 30 and audio unit harness connector M42 (B) terminal 50
  Continuity should exist.
2. Check continuity between satellite radio tuner (factory installed) harness connector M41 (A) terminal 30 and ground.
  Continuity should not exist.
OK or NG

OK : GO TO 4.

NG : Repair harness or connector.

Fig 3: Identifying Continuity Between Satellite Radio Tuner (Factory Installed) Harness Connector M41 (A) Terminal 30 And Ground
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) harness connector M41 terminal 28 and ground with CONSULT-II or oscilloscope.
28 - Ground : Refer to " TERMINALS AND REFERENCE VALUE FOR SATELLITE RADIO TUNER ".

OK or NG

OK : GO TO 5.

NG : Replace audio unit. Refer to "AUDIO UNIT ".

Fig 4: Identifying REQ1 Signal
CHECK TXD SIGNAL
1. Check signal between satellite radio tuner (factory installed) harness connector M41 terminal 29 and ground with CONSULT-II or oscilloscope.
  29 - Ground : Refer to " TERMINALS AND REFERENCE VALUE FOR SATELLITE RADIO TUNER ".
OK or NG

OK : GO TO 6.

NG : Replace audio unit. Refer to "AUDIO UNIT ".

Fig 5: Identifying TXD Signal
CHECK RXD SIGNAL
1. Check signal between satellite radio tuner (factory installed) harness connector M41 terminal 30 and ground with CONSULT-II or oscilloscope.
  30 - Ground : Refer to " TERMINALS AND REFERENCE VALUE FOR SATELLITE RADIO TUNER ".
OK or NG

OK : Replace satellite radio tuner. Refer to "SATELLITE RADIO TUNER ".

NG : Replace audio unit. Refer to "AUDIO UNIT ".

Fig 6: Identifying RXD Signal