Bose W/ Color W/ Rear Control

U1243 DISPLAY UNIT





Description









DTC Logic









Diagnosis Procedure
Regarding Wiring Diagram information, Bose W/ Color W/ Rear Control.
1.CHECK DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUIT
Check display unit power supply and ground circuit. Bose W/ Color W/ Rear Control.
Is inspection result OK?
YES - GO TO 2.
NO - Repair malfunctioning parts.
2.CHECK CONTINUITY OF COMMUNICATION CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect display unit connector and AV control unit connector.





3. Check continuity between display unit harness connector M141 (A) terminals 11, 22 and AV control unit harness connector M44 (B) terminals 56, 44.





4. Check continuity between display unit harness connector M141 (A) terminals 11, 22 and ground.





Are continuity results as specified?
YES - GO TO 3.
NO - Repair harness or connector.
3.CHECK COMMUNICATION SIGNAL
1. Connect display unit connector and AV control unit connector.
2. Turn ignition switch ON.





3. Check signal between display unit harness connector M141 terminal 11 and ground with an oscilloscope or CONSULT-III.





Are voltage readings as specified?
YES - GO TO 4.
NO - Replace AV control unit. Bose W/ Color Display.
4.CHECK COMMUNICATION SIGNAL





Check signal between display unit harness connector M141 terminal 22 and ground with an oscilloscope or CONSULT-III.





Are voltage readings as specified?
YES - Inspection End.
NO - Replace display unit. Bose W/ Color Display.