Self-Diagnostic Function: Notes

NOTE: Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

The gauge control module has a self-diagnostic function which consists of the following checks:

The beeper drive circuit check.
The indicator drive circuit check.
The switch input test.
The LCD/MID segments check.
The gauges drive circuit check (Tachometer, Fuel gauge, Speedometer, Engine coolant temperature gauge).
The communication line check (of the body-controller area network (B-CAN) communication line and the fast-controller area network (F-CAN) communication line between the gauges).

NOTE: Indicators are also controlled via the communication lines.