Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Echo 2000-2002 Approved techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 02echorm di theft hornrela
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DI-423
DIAGNOSTICS - THEFT DETERRENT SYSTEM
DI01Z-15
Horn Relay Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, it causes the Tr in the ECU to switch ON and OFF in approxi-
mately 0.4 sec. cycles. This switches the horn relay ON and OFF, thus the horns blow (See the wiring dia-
gram below).
In this condition, if any of the following operations is done, the Tr in the ECU goes OFF and the horn relay
switches OFF, thus stopping the horns from blowing:
(1) Unlock the front LH or RH door with key.
(2) Turn the ignition switch to IG or ON position.
(3) Unlock the doors with the wireless door lock control system.
(4) Wait for approximately 60 seconds.
WIRING DIAGRAM
W-R 10 W-R Theft Deterrent
Engine Room J/B
ID3 ECU
Horn Relay 4 12
1 2 W-R W-R
1 1 ID3 T6 HORN
G-W 3 G-R
5
1 1
W-R
G-W HORN
2 1
1 1
1
1
FL Block B-L H4 C16
Battery Horn
MAIN 2 Horn
Switch
I13714
2002 ECHO (RM884U)
Author : Date : 593
DI-424
DIAGNOSTICS - THEFT DETERRENT SYSTEM
INSPECTION PROCEDURE
HINT:
The flow chart below is based on the premise that the horns blow normally whenever the horn switch is oper-
ated. If horn operation is not normal when the horn switch is operated, check the horn switch.
1 Check voltage between terminal HORN of theft deterrent ECU connector and
body ground.
PREPARATION:
LOCK (a) Remove the glove compartment door.
(b) Disconnect the theft deterrent ECU connectors.
CHECK:
Disconnect
Measure voltage between terminal HORN of theft deterrent
ECU connector and body ground.
OK:
(+) (-)
Voltage: 10 - 14 V
HORN I02920
NG Check and repair harness and connector be-
tween theft deterrent ECU and horn relay.
OK
Check and replace theft deterrent ECU.
2002 ECHO (RM884U)
Author : Date : 594
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