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10. HORN ACTIVATION CIRCUIT
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10.
Description of operation
The ECU transistor is turned ON if the vehicle door, etc. are
opened without use of the key.
This energizes the horn relay to activate the horn.
Checking the horn activation circuit (Disconnect the connector
of the ECU, then short-circuit terminal connector
No.58,
and
activate the horn relay.)
54-230
CHASSIS ELECTRICAL
-
Theft-alarm System
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Step
1
Check object
mat Mal-
I
I
condi- function
Cause Remedy
Horn
relay termi-
nal
voltage
(4-Ground)
12v ov Malfunction of
Check the
the
horn
relay horn
relay
(Refer to
P.54-118.)
Horn
terminal volt-
12v ov
Harness
dam-
age
(LH
&
RH)
Repair the
aged or
discon- harness
(1 -Ground)
netted
Horn
terminal volt-
age
(LH
&
RH)
(1 -Ground)
Nor-
1
I
I
tion
Horn
Horn
Malfunction of
Replace
soun
doesn’t the
horn
the
horn
ds (0 sound
V)
(0
w
Battery
Damaged or
dis-
Repair the
voltage
connected wiring harness
of ground circuit
11. THEFT ALARM HORN RELAY POWER-SUPPLY
CIRCUIT
Description of operation
Power voltage is always supplied to theft alarm horn relay.
Checking the horn relay power-supply circuit (Disconnect the
theft alarm horn relay)
Check object
THEFT
ALARM
HORN RELAY
connector terminal
voltage 1
Normal
Mal-
condi-
func-
Cause
Remedy
tion
tion
12v
ov
Fuse (14)
dam-
Replace the
aged or
discon- fuse
netted
Damaged or
dis-
Repair the
har-
connected har-
ness
ness
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