Vehicle Speed Signal Inspection For Display Control Unit

NAVIGATION SYSTEM


Vehicle Speed Signal Inspection for Display Control Unit

1.CHECK HARNESS
1. Turn ignition switch OFF.
2. Disconnect display control unit connector M94, NAVI control unit connector B505 and combination meter connector M24.





3. Check continuity between combination meter connector M24 (A) terminal 26 and display control unit connector M94 (B) terminal 16.

Continuity should exist.

4. Check continuity between display control unit harness connector M94 (B) terminal 16 and ground.

Continuity should not exist.

OK or NG
OK - GO TO 2.
NG - Repair harness.
2.CHECK 1: VEHICLE SPEED SIGNAL
1. Connect display control unit connector, NAVI control unit connector and combination meter connector.
2. Turn ignition switch ON.





3. Check voltage between display control unit harness connector M94 terminal 16 and ground.

Approx. 3.5V or more

OK or NG
OK - GO TO 3.
NG - Replace display control unit. Refer to Integrated Display System.
3.CHECK 2: VEHICLE SPEED SIGNAL
1. Drive vehicle at a constant speed.





2. Check signal between display control unit harness connector M94 terminal 16 and ground with CONSULT-III or oscilloscope.

16 - Ground : Refer to Terminal And Reference Value For Display Control Unit.


OK or NG
OK - Replace display control unit. Refer to Integrated Display System.
NG - Check combination meter system. Refer to Vehicle Speed Signal Inspection,