Thanks a lot for the info/link

I belive my car is the MID display type, it has 2 rows on the display, time and temp at top and date (when radio off at bottom)

Not too sure how im going to control the MRQ line at the same time as sending I2C data, using the I2CWrite command as it would appear the MRQ line changes state in the middle of the I2C data being transfered.