U1255

U1255 SATELLITE RADIO TUNER





Description









DTC Logic

DTC Logic:

Diagnosis Procedure
1.CHECK SATELLITE RADIO TUNER POWER SUPPLY AND GROUND CIRCUIT
Check satellite radio tuner power supply and ground circuits. 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 and satellite radio tuner connector.
3. Check continuity between AV control unit harness connector terminals 28, 29, 30 and satellite radio tuner harness connector terminals 8, 9, 10.

28 - 8 : Continuity should exist.
29 - 9 : Continuity should exist.
30 - 10 : Continuity should exist.

4. Check continuity between AV control unit harness connector terminals 28, 29, 30 and ground.

28 - Ground : Continuity should not exist.
29 - Ground : Continuity should not exist.
30 - Ground : Continuity should not exist.

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 terminal 28, 29 and ground.

28 - Ground : Approx 7.0 V
29 - Ground : Approx 7.0 V

Is the inspection result normal?
YES - GO TO 4.
NO - Replace 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 10 and ground.

10 - Ground : Approx 7.0 V

Is the inspection result normal?
YES - INSPECTION END
NO - Replace satellite radio tuner.