Satellite Radio Tuner (Factory Installed) Communication Circuit Inspection

WARNING: This page is about a different car, the 2007 Nissan Pathfinder. 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.
  
  Fig 1: Checking Continuity Between Continuity Between Satellite Radio Tuner Connector M41 Terminal 28 And Ground
OK or NG

OK: GO TO 2.

NG: Repair harness or connector.
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.
  
  Fig 2: Checking Continuity Between Satellite Radio Tuner (Factory Installed) M41 (A) Terminal 29 And Ground
OK or NG

OK: GO TO 3.

NG: Repair harness or connector.
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.
  
  Fig 3: Checking Continuity Between Satellite Radio Tuner Harness Connector M41 Terminal 30, Audio Unit Harness Connector M42 Terminal 50
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.
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 VALUES FOR SATELLITE RADIO TUNER ".
  
  Fig 4: Checking Signal Between Satellite Radio Tuner (Factory Installed) M41 Terminal 28 And Ground
OK or NG

OK: GO TO 5.

NG: Replace audio unit. Refer too. "AUDIO UNIT - WITH NAVI " or "AUDIO UNIT - WITHOUT NAVI ".
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 VALUES FOR SATELLITE RADIO TUNER ".
OK or NG

OK: GO TO 6.

NG: Replace audio unit. Refer to "AUDIO UNIT - WITH NAVI " or "AUDIO UNIT - WITHOUT NAVI ".

Fig 5: Checking Signal Between Satellite Radio Tuner (Factory Installed) M41 Terminal 29 And Ground
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 VALUES 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 - WITH NAVI " or "AUDIO UNIT - WITHOUT NAVI ".

Fig 6: Checking Signal Between Satellite Radio Tuner (Factory Installed) Connector M41 Terminal 30 And Ground