Page 737 of 2543
(See page IN±30).
Check voltage between terminal SH of theft deterrent horn connector
and body ground.
Remove the theft deterrent horn and disconnect the
connector.
Measure voltage between terminal 1 of theft deter-
rent horn connector and body ground.
Voltage: 10 ± 14 V
Check and repair harness and connector between
HORN fuse and theft deterrent horn.
Connect positive (+) lead to terminal 1 and negative
(±) lead to terminal 2 of theft deterrent horn connec-
tor.
Theft deterrent horn blows.
Replace theft deterrent horn.
Check theft deterrent horn.
Check harness and connector between theft deterrent and door lock ECU
and theft deterrent horn (See page IN±30).
Check and repair harness or connector.
Check and replace theft deterrent ECU.
INSPECTION PROCEDURE
± BODY ELECTRICAL SYSTEMBE±135THEFT DETERRENT AND DOOR LOCK CONTROL SYSTEM
Page 738 of 2543
Headlight Control Relay Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, it causes the Tr in the ECU to switch on and off at approximately
0.2 sec. intervals. This switches the headlight control relay on and off, thus flashing the headlights (See the wir-
ing diagram below).
In this condition, if any of the following operations is done, the Tr in the ECU goes off and the headlight control
relay switches off, thus stopping the headlights flashing:
(1) The front LH or RH door is unlocked with a key.
(2) The ignition switch is turned to ACC or ON position.
(3) Approximately 1 minute elapses.
BE±136± BODY ELECTRICAL SYSTEMTHEFT DETERRENT AND DOOR LOCK CONTROL SYSTEM
Page 739 of 2543
INSPECTION PROCEDURE
HINT: The flow chart below is based on the premise that the headlights light up normally whenever the light con±
trol switch is operated. If headlight operation is not normal when the light control switch is operated, pro±
ceed to troubleshooting on page BE±11.
Check and replace theft deterrent and door lock
ECU.
Measure voltage between terminal HEAD of theft
deterrent ECU connector and body ground.
Voltage: 10 ± 14 V
Check and repair harness and connector between theft deterrent and door lock ECU headlight
control relay (See page IN±30).
Check voltage between terminal HEAD of theft deterrent and door lock
ECU connector and body ground.
(1) Remove instrument panel.
(See BO section)
(2) Disconnect the ECU connector.
± BODY ELECTRICAL SYSTEMBE±137THEFT DETERRENT AND DOOR LOCK CONTROL SYSTEM
Page 740 of 2543
Taillight Control Relay Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, it causes the Tr in the ECU to switch on and off at approximately
0.2 sec. intervals. This switches the taillight control relay on and off, thus flashing the taillights (See the wiring
diagram below).
In this condition, if any of the following operations is done, the Tr in the ECU goes off and the taillight control
relay switches off, thus stopping the taillights flashing:
(1) The front LH or RH door is unlocked with a key.
(2) The ignition switch is turned to ACC or ON position.
(3) Approximately 1 minute elapses.
BE±138± BODY ELECTRICAL SYSTEMTHEFT DETERRENT AND DOOR LOCK CONTROL SYSTEM
Page 741 of 2543
INSPECTION PROCEDURE
(See page IN±30).
(1) Remove instrument panel.
(See BO section)
(2) Disconnect the ECU connector.
Check and replace theft deterrent ECU.
Measure voltage between terminal TAIL of theft
deterrent and door lock ECU connector and body
ground.
Voltage: 10 ± 14 V
Check and repair harness and connector between theft deterrent and door lock ECU taillight
control relay (See page IN±30).
Check voltage between terminal TAIL of theft deterrent door lock ECU
connector and body ground.
± BODY ELECTRICAL SYSTEMBE±139THEFT DETERRENT AND DOOR LOCK CONTROL SYSTEM
Page 742 of 2543
Ignition Switch Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned to the ACC position, battery positive voltage is applied to the terminal ACC
of the ECU. Also, if the ignition switch is turned to the ON position, battery voltage is applied to the terminals
ACC and IG of the ECU. When the battery positive voltage is applied to the terminal ACC of the ECU while the
theft deterrent system is activated, the warning stops. Furthermore, power supplied from the terminals ACC and
IG of the ECU is used as power for the door courtesy switch, and position switch, etc.
BE±140± BODY ELECTRICAL SYSTEMTHEFT DETERRENT AND DOOR LOCK CONTROL SYSTEM
Page 743 of 2543
(See page IN±30).
Check for short in all the harness and
components connected to the CIG and ECU±IG
fuses (See attached wiring diagram).
(1) Remove instrument panel.
(See BO section)
(2) Disconnect the ECU connector.
(3) Turn ignition switch ON.
Check and replace theft deterrent and door lock
ECU.
Measure voltage between terminal IG and ACC of
theft deterrent ECU connector and body ground.
Voltage: 10 ± 14 V
Check and repair harness and connector between theft deterrent and door lock ECU and battery
(See page IN±30).
Check voltage between terminals IG and ACC of theft deterrent and door
lock ECU and body ground.
Continuity
Remove CIG and ECU±IG fuses from J/B NO. 1.
Check continuity of CIG and ECU±IG fuses.
Check CIG and ECU±IG fuses.
INSPECTION PROCEDURE
± BODY ELECTRICAL SYSTEMBE±141
THEFT DETERRENT AND DOOR LOCK CONTROL SYSTEM
Page 744 of 2543
Luggage Compartment Door Key Lock and Unlock Switch Circuit
CIRCUIT DESCRIPTION
The luggage compartment door key lock and unlock switch goes on when the back door key cylinder is turned
to the unlock side with the key.
BE±142± BODY ELECTRICAL SYSTEM
THEFT DETERRENT AND DOOR LOCK CONTROL SYSTEM