Satellite Radio Tuner (Factory Installed) Communication Circuit Inspection

WARNING: This page is about a different car, the 2008 Nissan Maxima. 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 B137 and audio unit connector M109.
3. Check continuity between satellite radio tuner (factory installed) harness connector B137 (A) terminal 28 and audio unit harness connector M109 (B) terminal 48
  Continuity should exist.
4. Check continuity between satellite radio tuner (factory installed) harness connector B137 (A) terminal 28 and ground.
  Continuity should not exist.
Fig 1: Checking Continuity Between Satellite Radio Tuner Harness Connector B137 Terminal 28 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

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 B137 (A) terminal 29 and audio unit harness connector M109 (B) terminal 49
  Continuity should exist.
2. Check continuity between satellite radio tuner (factory installed) harness connector B137 (A) terminal 29 and ground.
  Continuity should not exist.
Fig 2: Checking Continuity Between Satellite Radio Tuner Harness Connector B137 Terminal 29 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

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 B137 (A) terminal 30 and audio unit harness connector M109 (B) terminal 50
  Continuity should exist.
2. Check continuity between satellite radio tuner (factory installed) harness connector B137 (A) terminal 30 and ground.
  Continuity should not exist.
Fig 3: Checking Continuity Between Satellite Radio Tuner Harness Connector B137 Terminal 30 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

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 B137 terminal 28 and ground with CONSULT-III or oscilloscope.
  28 - Ground: Refer to "TERMINALS AND REFERENCE VALUE FOR SATELLITE RADIO TUNER ".
Fig 4: Checking Signal Between Satellite Radio Tuner Harness Connector B137 Terminal 28 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 5.

NG: Replace audio unit. Refer to "AUDIO UNIT ".
CHECK TXD SIGNAL
Check signal between satellite radio tuner (factory installed) harness connector B137 terminal 29 and ground with CONSULT-III or oscilloscope.

29 - Ground: Refer to "TERMINALS AND REFERENCE VALUE FOR SATELLITE RADIO TUNER ".

Fig 5: Checking Signal Between Satellite Radio Tuner Harness Connector B137 Terminal 29 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 6.

NG: Replace audio unit. Refer to "AUDIO UNIT ".
CHECK RXD SIGNAL
Check signal between satellite radio tuner (factory installed) harness connector B137 terminal 30 and ground with CONSULT-III or oscilloscope.

30 - Ground: Refer to "TERMINALS AND REFERENCE VALUE FOR SATELLITE RADIO TUNER ".

Fig 6: Checking Signal Between Satellite Radio Tuner Harness Connector B137 Terminal 30 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

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

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