Honda Acura NSX 1991 Service Manual page 1162

Lighting System
Remove the glove box lower panel and glove box.
Disconnect the 8-P and 4-P connectors from the daytime
running light control unit.
Make the following input tests at the harness pins. If all
tests prove OK, yet the system still fails to work, replace
the control unit.
Wire
No. Test condition
Under all conditions.
1
BLK
Under all conditions.
2 PNKIWHT
Ignition switch ON.
3 BLK/RED
Lighting switch ON.
4 PNK/BLK
Under all conditions.
5
Ignition switch ON.
6
Parking
7 GRNNEL ON (parking brake
lever up).
23-l 76
Test: desired
Check for continuity to ground:
should be continuity.
Check for voltage to ground:
should be battery voltage.
Check for voltage to ground:
should be battery voltage.
Check for voltage to ground:
should be battery voltage.
Check for continuity to ground:
should be continuity.
Connect to ground:
Brake light bulb failure light
should come on.
brake switch Check for continuity to ground:
should be continuity.
CONTROL UNIT (CANADA)
Possible cause (if result is not obtained)
result
Poor ground (G401)
l
An open in the wire.
l
Blown No. 44 (IOA) fuse.
l
An open in the wire.
l
Blown No. 3 (7.5A) fuse.
l
An open in the wire.
l
Blown No. 43 (15Aj fuse.
l
Faulty lighting switch.
l
An open in the wire.
l
Blown daytime running light
l
bulbs.
Poor ground (G301).
l
An open in the wire.
l
Blown No. 5 (IO A) fuse.
l
Blown bulb.
l
An open in the wire.
l
Faulty parking brake switch.
l
An open in the wire.
l
RUNNING LIGHT