Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 theft cihornre
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DI-541
DIAGNOSTICS - THEFT DETERRENT SYSTEM
DI06W-1 1
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 cycles.
This switches the horn relay ON and OFF, thus the horns blow (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 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 ACC or ON position.
(3) Unlock the doors with the wireless door lock control system.
(4) Wait for approximately 60 seconds.
(5) Push the panic switch of the wireless door lock control system.
WIRING DIAGRAM
G-W G-W
1 1
Horn Horn
Engine Room J/B No.2
HORN Relay
1 Theft Deterrent ECU
5 3
2F
J18
HORN J/C 15
3 10 12
W 1 2 G-B G-B G-B T4 HORN
2B 2K IG2
B B
B-L
FL MAIN
Battery
I09492
2001 SIENNA (RM787U)
Author : Date : 695
DI-542
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:
Disconnect the theft deterrent ECU connectors.
CHECK:
Measure voltage between terminal HORN of theft deterrent
ECU connector and body ground.
OK:
Voltage: 10-14 V
(+) (-)
HORN
I01923
NG Check and repair harness and connector be-
tween theft deterrent ECU and horn relay.
OK
Check and replace theft deterrent ECU.
2001 SIENNA (RM787U)
Author : Date : 696
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