Test O: The Charging System Indicator Is Never/Always On

PINPOINT TEST O: THE CHARGING SYSTEM INDICATOR IS NEVER/ALWAYS ON

O1-O3:

O4-O5:

Normal Operation
The charging system indicator is controlled by the instrument cluster based upon data received from the PCM over the high speed controller area network (HS-CAN) communication bus.

If the charging system message is missing for less than 5 seconds, the charging system indicator remains in the last indication mode (on or off). If the charging system message is missing for more than 5 seconds, the instrument cluster sets DTC U0100 in continuous memory and defaults the charging system indicator on.

NOTE: If DTC U0100 is set in the instrument cluster, other observable symptoms may be an inoperative speedometer, tachometer or odometer.

Possible Causes
- Charging system
- PCM
- Instrument cluster