DTC 37, "M" Clock CKT Shorted To Battery Or CCM Internal Open: Notes

"M" clock circuit carries a square wave signal which provides alternating voltage to LCD backplane. This square wave signal is required for proper operation of LCD. "M" clock circuit is brought low by CCM for about 80 milliseconds during CCM power-up. CCM takes samples of "M" clock circuit during the last 40 milliseconds to ensure circuit is responding to CCM command.

DTC 37 will set when CCM senses high samples on "M" clock circuit when samples should be low during CCM power-up.

When DTC 37 is set, SYS will flash. DTC 37 will clear when CCM does not sense high samples on "M" clock circuit during CCM power-up.