I hope the attached helps:
To guide you:
N3/10 is the ME-SFI [ME] control module.
S40 is the Cruise Control switch.
S40s1 Resume from memory
S40s2 Decelerate and set
S40s3 Accelerate and set
S40s5 Control contact
I'd check the fuse shown and the connector x1 to see if the connector has come adrift.
Diagnostic info basically is as follows:
On N3/10 each of the five inputs should measure under 1V with the ignition on and the switch not activated. As you activate each switch the corresponding pin should go to 12V. Pin 4.34 should go to 12V when any switch is activated - in addition to the switch input itself.
On N3/10 the pins are:
Pin 4.31 Decelerate/set switch
Pin 4.32 Acceleration/set switch
Pin 4.33 Cruise control OFF switch
Pin 4.34 Control contact switch. No switch activated - voltage under 1 VDC. Any switch activated this should measure 12 VDC
Pin 4.35 Memory recall switch