U1255

U1255 SATELLITE RADIO TUNER





Description









DTC Logic









Diagnosis Procedure
1. CHECK SATELLITE RADIO TUNER POWER SUPPLY AND GROUND CIRCUIT
Check satellite radio tuner power supply and ground circuit. Refer to Satellite Radio Tuner.
Is the inspection result normal?
YES - GO TO 2.
NO - Repair malfunctioning parts.
2. CHECK CONTINUITY COMMUNICATION CIRCUIT AND REQUEST SIGNAL CIRCUIT





1. Turn ignition switch OFF.
2. Disconnect AV control unit connector M43 and satellite radio tuner connector B111.
3. Check continuity between AV control unit harness connector M43 (A) and satellite radio tuner harness connector B111 (B).






4. Check continuity between AV control unit harness connector M43 (A) and ground.





Is the inspection result normal?
YES - GO TO 3.
NO - Repair harness or connector.
3. CHECK AV CONTROL UNIT VOLTAGE





1. Connect AV control unit connector.
2. Turn ignition switch ON.
3. Check voltage between AV control unit harness connector M43 and ground.





Is the inspection result normal?
YES - GO TO 4.
NO - Replace AV control unit. Refer to AV Control Unit.
4. CHECK SATELLITE RADIO TUNER





1. Turn ignition switch OFF.
2. Disconnect AV control unit connector.
3. Connect satellite radio tuner.
4. Turn ignition switch ON.
5. Check voltage between satellite radio tuner harness connector terminal ground.





Is the inspection result normal?
YES - Inspection End.
NO - Replace satellite radio tuner. Refer to Satellite Radio Tuner.