1.CHECK DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUIT Check display unit power supply and ground circuit. Refer to Diagnosis Procedure. Is the inspection result normal? YES>>GO TO 2. NO>>Repair malfunctioning parts.
2.CHECK CONTINUITY 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 and AV control unit harness connector.

   Display unit | AV control unit | Continuity
   Connector | Terminals | Connector | Terminals
   M93 | 9 | M203 | 89 | Existed
   10 | 73

4. Check continuity between display unit harness connector and ground.

   Display unit | Ground | Continuity
   Connector | Terminals
   M93 | 9 | Not existed
   10

Is the inspection result normal?
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 and ground.

   (+) | (−) | Condition | Reference value
   Display unit
   Connector | Terminal
   M93 | 9 | Ground | When adjusting display brightness. |

Is the inspection result normal?
YES>>GO TO 4.
NO>>Replace AV control unit.
4.CHECK COMMUNICATION SIGNAL
Check signal between display unit harness connector and ground.

(+) | (−) | Condition | Reference value
Display unit
Connector | Terminal
M93 | 10 | Ground | When adjusting display brightness. |

Is the inspection result normal?
YES>>INSPECTION END
NO>>Replace display unit.