Honda Acura NSX 1991, Service Manual

Page: 1191 / 1420

Brake Light Switch Test
1 .
If the brake lights do not go on, check the No. 45
(20A) fuse in the main relay box, and the brake light
bulbs in the taillight assembly, and the LED in the
high mount brake light.
2. If the fuse and bulbs are OK, disconnect the 4-P con-
nector from the brake light switch.
CONNECTOR
BRAKE
PEDAL
3. Check for continuity between the B and C terminals.
There should be continuity with the brake pedal
pushed.
l
If there is no continuity, replace the switch or ad-
just pedal height (see section 19).
l
If there is continuity, but the brake lights do not
go on, inspect for:
Poor ground (G401, G501).
An open is the or wire.
Faulty brake light failure sensors (see page
23-151).
High Mount Brake Light Test
1 . Open the trunk lid and engine cover.
2. Disconnect the 2-P connector from the trunk wire
harness.
View from terminal side
3 .
4.
5.
Connect voltmeter positive probe to the
terminal, negative probe to BLK terminal.
When the brake pedal is pushed, check for voltage
between
and BLK terminals. There should
be voltage.
If there is no voltage, check for:
Blown No. 45 (20 A) fuse in the main relay box.
An open in th or BLK wire.
Faulty brake light switch.
l If there is battery voltage, go to step 4.
Connect battery positive to terminal,
negative to BLK terminal.
Check go on all the
of the high mount brake
light.
If the high mount brake light does not go on,
check for an open in the wires in the trunk lid.
If the wires in the trunk lid are OK, replace the
high mount brake light.
If some of the high mount brake light do not
go on, replace the high mount brake light assembly.
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