Nissan Maxima Service and Repair Manual: U1243 display unit

DTC Logic

Diagnosis Procedure

1.CHECK DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUIT

Check display unit power supply and ground circuit

2.CHECK CONTINUITY OF COMMUNICATION CIRCUIT

1. Turn ignition switch OFF.
2. Disconnect display unit connector M142 and AV control unit connector M163.
3. Check continuity between display unit harness connector M142 (A) terminals 9, 10 and AV control unit harness connector M163 (B) terminals 45 and 61
4. Check continuity between display unit harness connector M142 (A) terminals 9, 10 and ground.

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 M142 terminal 9 and ground with an oscilloscope or CONSULT

4.CHECK COMMUNICATION SIGNAL

Check signal between display unit harness connector M142 terminal 10 and ground with an oscilloscope or CONSULT.