Honda Acura NSX 1991 Service Manual page 927

From page 22-38
Check for continuity between:
No.25 (8LK) and body ground.
l
No.24 (BLK) and body ground.
l
Is there continuity?
Substitute a known-good control
unit and recheck. If symptomlindi-
Repair open BLK (No.24 or No.251
NO
wire between the control unit and
body ground. If wires are OK,
check for poor ground at G401.