Warning Systems.pdf

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2002 ACCESSORIES & EQUIPMENT
Horn System - RAV4
BODY ELECTRICAL SYSTEM
PRECAUTION
NOTE:
Take care to observe the following precautions when performing inspections or
removal and replacement of body electrical related parts.
1.
Headlight System
Halogen bulbs have pressurized gas inside and require special handling. They can burst if scratched or
dropped. Hold a bulb only by its plastic or metal case.
Don't touch the glass part of a bulb with bare hands.
2.
SRS (Supplemental Restraint System)
The RAV4 is equipped with an SRS (Supplemental Restraint System) such as the driver airbag and front
passenger airbag, failure to carry out service operation in the correct sequence could cause the SRS to
unexpectedly deploy during servicing, possibly leading to a serious accident. Before servicing (including
removal or installation of parts, inspection or replacement), be sure to read the precautionary notices in
AIR BAG SAFETY PRECAUTIONS
.
3.
Audio System
If the negative (-) terminal cable is disconnected from the battery, the preset AM, FM1 and FM2 stations
stored in memory are erased, so be sure to note the stations and reset them after the battery terminal is
reconnected.
4.
Mobile Communication System
If the vehicle is equipped with a mobile communication system, refer to precautions in
IF VEHICLE IS
EQUIPPED WITH MOBILE COMMUNICATION SYSTEM
.
TROUBLESHOOTING
PROBLEM SYMPTOMS
HORN SYSTEM
Symptom/Suspected Area
Horn Symptom Does Not Operate
HORN Fuse
See
FUSES & CIRCUIT BREAKERS
Horn Relay
Horn Switch
Horn
Wire Harness
Horns Blow All The Time
Horn Relay
Horn Switch
Wire Harness
One Horn Operates But The Other Horn Does Not Operate
Horn
Wire Harness
Horns Operate Abnormally
Horn Relay
Horn
Wire Harness
Step 3 under INSPECTION
Step 1 under INSPECTION
Step 2 under INSPECTION
.....
Step 3 under INSPECTION
Step 1 under INSPECTION
.....
Step 2 under INSPECTION
.....
Step 3 under INSPECTION
Step 2 under INSPECTION
.....
HORN SYSTEM
LOCATION
Fig. 1: Identifying Horn System Components
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION
1.
Inspect horn switch
.
a. Check that no continuity exists between terminal 6 of the connector and body ground.
Fig. 2: Inspecting Horn Switch
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Check that continuity exists between terminal 6 of the connector and body ground when the horn
contact plate is pressed against the steering spoke assembly.
If continuity is not as specified, repair or replace the steering wheel or wire harness as necessary.
2.
Inspection Horn Operation
Connect the positive (+) lead from the battery to the terminal and negative (-) lead to the horn body and
check that the horn blows.
Fig. 3: Testing Horn
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
If operation is not as specified, replace the horn.
3.
Inspect horn relay (Marking: HORN) continuity
.

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