Satellite Radio Tuner Communication Circuit Inspection

AUDIO


Satellite Radio Tuner Communication Circuit Inspection

1. CHECK HARNESS - 1
1. Turn ignition switch OFF.
2. Disconnect satellite radio tuner connector B56 and audio unit connector M45.





3. Check continuity between satellite radio tuner harness connector B56 (A) terminal 28 and audio unit harness connector M45 (B) terminal 40.

Continuity should exist.

4. Check continuity between satellite radio tuner harness connector B56 (A) terminal 28 and ground.

Continuity should not exist.

OK or NG
OK >> GO TO 2.
NG >> Repair harness or connector.
2. CHECK HARNESS - 2





1. Check continuity between satellite radio tuner harness connector B56 (A) terminal 29 and audio unit harness connector M45 (B) terminal 41.

Continuity should exist.

2. Check continuity between satellite radio tuner harness connector B56 (A) terminal 29 and ground.

Continuity should not exist.

OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
3. CHECK HARNESS - 3





1. Check continuity between satellite radio tuner harness connector B56 (A) terminal 30 and audio unit harness connector M45 (B) terminal 42.

Continuity should exist.

2. Check continuity between satellite radio tuner harness connector B56 (A) terminal 30 and ground.

Continuity should not exist.

OK or NG
OK >> GO TO 4.
NG >> Repair harness or connector.
4. CHECK REQ1 SIGNAL
1. Connect satellite radio tuner connector and audio unit connector.
2. Turn ignition switch to ACC.





3. Check signal between satellite radio tuner harness connector B56 terminal 28 and ground with CONSULT-III or oscilloscope.

28 - Ground : Refer to Terminal and Reference Value for Satellite Radio Tuner.

OK or NG
OK >> GO TO 5.
NG >> Replace audio unit. Refer to Service and Repair.
5. CHECK TXD SIGNAL





Check signal between satellite radio tuner harness connector B56 terminal 29 and ground with CONSULT-III or oscilloscope.

29 - Ground : Refer to Terminal and Reference Value for Satellite Radio Tuner

OK or NG
OK >> GO TO 6.
NG >> Replace audio unit. Refer to Service and Repair.
6. CHECK RXD SIGNAL





Check signal between satellite radio tuner harness connector B56 terminal 30 and ground with CONSULT-III or oscilloscope.

30 - Ground : Refer to Terminal and Reference Value for Satellite Radio Tuner.

OK or NG
OK >> Replace satellite radio tuner. Refer to Service and Repair.
NG >> Replace audio unit. Refer to Service and Repair.