Honda Civic 1998 Service Manual page 1325

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Disconnect the A and B connectors from the audio unit
Cavity
Wire Test condition
Reconnect the B connector only to the audio unit.
Cavity
wire
Tsst condition
Test: Desired result
Test: Desired result
Possible cause if result is not obtain€d
Possibls cause if r93ult is not obtaingd
A4
WHTiBLU
Under all conditions
Check for voltage to ground:
There should be battery voltage.
. Blown No. 47 (7.5 A) fuse in the
under-hood {use/relay box
. An open in the wire
YEURED
lgnition switch ACC {l}
Check for voltage to ground:
There should be battery voltage.
Blown No. 28 (10 A) fuse in the
under-dash fuse/relay box
An open in the wire
B6 BLfiEL
lgnition switch ON (ll)
Check for voltage to ground:
There should be battery voltage.
. Blown No. 14 (7.5 A) fuse in the
under-dash fuse/relay box
. An open in the wire
BLK
Under atl conditions
Check for continuity to ground:
There should be continuitv.
Poor ground (G401, G402)
An open in the wire
B I BLU/RED
lgnition key inserted
into the ignition keY
switch
Check for voltage to ground:
There should be 1 V or less.
Poor ground {G401. G402)
Faulty ignition key switch
An open in the wire
Short in the wire
lgnition key removed
from the ignition key
switch
Check for voltage to ground:
There should be 4 V or more.
B3 BLU//EL
Under allconditions
Check tor continuity between the
audio unit 16P connector No. 3 ter-
minal and power door lock control
unit 12P connector No. 6 terminal:
There should be continuity.
. An open in the wire
B8
LT GRN/
B L K
Ceiling light switch in
"middle position"
Connect to ground:
The ceiling light should come on.
Blown No. 43 (7.5 A) fuse in the
under-hood tuse/relay box
Blown ceiling light bulb
Faulty ceiling light
An open in the wire
8 1 4
LT GRN/
R E D
Each door open, one at
a Irme
Check for voltage to ground:
There should be 1 V or less.
. Faulty door switch
. An open in the wire
B 1 6
G R Y
Under all conditions
Connect to ground:
Horn should sound.
Blown No.52 (15 A) fuse in the
under-hood fuse/relay box
Faulty horn
Faulty horn relay
An open in the wire
B9 GRN/ORN
Driver's door lock
switch in UNLOCK
Check for voltage to ground:
There should be 1 V or less.
Poor ground (G551)
Faulty driver's door lock switch
An open in the wire
Shon in the wire
Driver's door lock
switch in LOCK
Check for voltage to ground:
There should be 4 V or more.
8 1 0 GRN/WHT
Driver's door lock
switch in UNLOCK
Check for voltage to ground:
There should be 4 V or more.
Poor ground (G551)
Faulty driver's door lock switch
An open in the wire
Short in the wire
Driver's door lock
switch in LOCK
Check fo. voltage to ground:
There should be 1 V or less.
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