Honda Prelude 1993 Service Manual page 1248

Integrated Control Unit
Input Test (cont'd)
View from terminal side of the
under-dash tuse/relay box socket
Rear Window Defogger Timer Circuit:
No, Terminal Test condition
Engins Oil P.assur€ Indicator Flashor Svstem:
No. T€rminal
T€st condition
View from wire side o{ the harness connector
Test: Desired result
Possible cause if result is not obtainod
Tsst: Dosired tosult
Possible cause il result is not obtained
1 B1
Under all conditions.
Check for continuity to ground:
There should be continuity.
. Poor ground (G40'1 . G402. G4O4l.
. An open in the wire.
8 1 3 Defogger switch
p u s h e d .
Check for continuity to ground:
There should be continuity as
the switch is pushed.
Faulty defogger switch.
Poor ground {G4O1, c4O2, c404}.
An open in the wire.
812 lgnition switch ON.
Attach to ground:
Rear window defogger should
work and the defogger switch
indicator light should come on.
Blown No. 34 (40 A) fuse.
(ln the under-hood fuse/relay boxl
Faulty defogger relay.
Blown LED.
An open in the wire.
4
B 9
lgnition switch ON.
Check for voltage to ground:
There should be battery
voltage.
. B l o w n N o . 1 3 ( 1 O A ) f u s e .
(ln the unde.-dash fuse/relay boxI
. An open in the wire,
I
B1
Under all conditions.
Check lor continuity to ground:
There should be continuity.
. Poor ground (G4O1 . G4O2, G4O4t.
. An open in the wire.
B 9
lgnition switch ON. Check for voltage to ground:
There should be battery
voltage.
. B l o w n N o . 1 3 ( 1 O A ) f u s e .
(ln the under-dash fuse/relay box)
. An open in the wire.
WHT/BLUl Engine running.
Check for voltage to ground:
There should be battery
voltage.
. Faulty charging system.
. An open in the wire.
4 YEL/RED
lginition switch OFF.
Check for continuity to ground:
Theie should be continuity.
. Faulty engine oil pressure switch.
. An open in the wire.
lgnition switch ON.
Check indicaror light. lf the
light does not come on, attach
the YEL/RED terminal to
ground: The light should come
on as the ignition switch is
turned ON.
. B l o w n b u l b .
. An open in the wire.
Start the engine.
Check tor voltage to ground:
There should be battery
voltage.
Insulficient oil.
lmp.oper lubrication.
Faulty engine oil pressure switch.
23-170