Cummins ISX11.9 CM2250 – Service Manual Fault Code Warning Lamps Do Not Illuminate

Keyswitch is in the OFF position

Turn the keyswitch to the ON position.

Fault code warning lamps are burned out

Check the warning lamps for voltage. Replace the bulbs if necessary. Refer to
Procedure 019-046 in Section 19
.

Fault code warning lamp circuit is malfunctioning

Check the fault code warning lamp circuit. Refer to
Procedure 019-047 in Section 19
.

Keyswitch circuit is malfunctioning

Check the vehicle, equipment, or vessel keyswitch circuit. Refer to
Procedure 019-064 in Section 19
.