Honda Acura NSX 1991 Service Manual page 731

Troubleshooting
Anti-lock Brake System Indicator
Light
Temporary Driving Conditions:
1 . The anti-lock brake system indicator light will come
on and the control unit memorizes the problem
under certain conditions.
NOTE: Problem codes explained on pages 19-46.
nering speed.
Problem codes: 5, 5-4, 5-8.
stuck condition on a muddy, snowy, or sandy
road.
Problem code: 4-1, 4-2, 4-4, 4-8.
l When the parking brake is applied for more than
30 seconds while the vehicle is being driven.
Problem code: 2.
The anti-lock brake system is OK, if the anti-lock
brake system indicator light: goes off after the
engine is restarted.
ANTI-LOCK BRAKE SYSTEM INDICATOR LIGHT
2 . If you receive a customer's report that the anti-lock
brake system indicator light sometimes comes on,
check the system using the ALB checker to confirm
whether there is any trouble in the system.
See page 19-41.
3. The anti-lock brake system indicator light will come
on and the control unit will store a problem code
when there is insufficient battery voltage to the
control unit. An example would be when the bat-
tery is so weak that the car must be jump-started.
After the battery is sufficiently recharged, the anti-
lock system indicator light will work normally after
the engine is stopped and restarted.
However, after recharging the battery, the problem
code must be cleared from the control unit's
memory by disconnecting the ALB 2.3 (No. 32)
fuse for at least 3 seconds.
19-44
Anti-lock Brake System Indicator Light Circuit:
CAUTION: Use only the digital multimeter to
check the system.
The indicator light, does not go on when the igni-
1 .
tion switch is turned on.
Check the following items. If they are OK, check
the control unit connectors.
If not loose or disconnected, install a new control
unit and recheck:
l Blown anti-lock brake system indicator light
bulb.
fuse and gauge assembly.
assembly and control unit.
to the body.
2. The anti-lock brake system indicator light remains
ON or after the engine is started, however the anti-
lock brake system indicator light does not blink any
code or sub-code. Check the following items:
the control unit.
(No. 32) fuse and control unit.
4 (15 A) and fail safe relay(s).
ween fail safe relay(s).
assembly and control unit.
nator and control unit.
If the problem is not found substitute a known-good
control unit and recheck whether the warning light re-
mains ON.