Lexus GS300/400 (2000 year). Service manual — part 75
BE0FY–09
I01377
Horn
Horn Switch
Engine Room No.1
Junction Block
HORN Fuse
Theft Deterrent Horn
Engine Room No.2
Junction Block
Horn Relay
–
BODY ELECTRICAL
HORN SYSTEM
BE–249
2550
HORN SYSTEM
LOCATION
The vehicle shown in this illustration is ”GS400”.
All components of ”GS300” other than the ones used for engine are same as ”GS400”.
BE0FZ–08
I04195
I04196
6
I04197
BE–250
–
BODY ELECTRICAL
HORN SYSTEM
2551
INSPECTION
1.
INSPECT HORN SWITCH
(a)
Disconnect the negative (–) terminal from the battery.
(b)
Remove the left and right covers from the steering wheel.
(c)
Using a torx socket wrench, loosen the 2 bolts.
(d)
Pull up the horn pad and place it on the steering column,
as shown.
HINT:
Do not disconnect the connector from the horn pad.
(e)
Disconnect the connector from the slip ring.
(f)
Check that no continuity exists between terminal 6 of the
connector and body ground.
(g)
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.
(h)
Install the horn pad in place and using a torx socket
wrench, torque the 2 bolts.
Torque:
7.1 N·m (72 kgf·cm, 62 in.·lbf)
(i)
Install the left and right covers.
(j)
Connect the negative (–) terminal to the battery.
2.
INSPECT 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.
If operation is not as specified, replace the horn.
3.
INSPECT HORN SWITCH CIRCUIT
(See page
I01200
2
1
3
5
2
5
1
3
–
BODY ELECTRICAL
HORN SYSTEM
BE–251
2552
4.
INSPECT HORN RELAY CONTINUITY
Condition
Tester connection
Specified condition
Constant
1 – 2
Continuity
Apply B+ between
terminals 1 and 2.
3 – 5
Continuity
If continuity is not as specified, replace the relay.
5.
INSPECT HORN RELAY CIRCUIT
(See page
BE19B–01
–
BODY ELECTRICAL
TROUBLESHOOTING
BE–3
2304
TROUBLESHOOTING
PROBLEM SYMPTOMS TABLE
IGNITION SWITCH AND KEY UNLOCK WARNING SWITCH
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
Ignition Switch:
Symptom
Suspect Area
See page
Ignition switch is not set to each position.
4. Ignition switch
5. Power source circuit
–
Key Unlock Warning Switch:
Symptom
Suspect Area
See page
Key unlock warning system does not operate.
(The buzzer does not sound when the driver’s door is opened with
the ignition OFF and key inserted)
1. Key Unlock Warning Switch
2. Door Courtesy Switch
3. Wire Harness
–
Key unlock warning system does not operate.
(The buzzer sounds when the ignition key is ACC or ON)
1. Ignition Switch
2. Wire Harness
–
HEADLIGHT AND TAILLIGHT SYSTEM:
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
HINT:
To inspect the bulb and light control ECU, replace them with the ones working normally and judge whether
they work normally or not.
Symptom
Suspect Area
See page
”Automatic light control system” does not operate.
1. Automatic Light Control Sensor
2. Light Control Switch
3. Door Courtesy Switch
4. Wire Harness
5. Body No.2 ECU
–
Auto turn–off system does not operate when the driver’s door is
opened.
1. Drivers Door Courtesy Switch
Auto turn–off system:
Headlight and taillight do not come on.
1. Body ECU No.2
2. Wire Harness
–
Auto turn–off system:
Headlight and taillight stay on.
1. Body ECU No.2
2. Wire Harness
–
USA:
Symptom
Suspect Area
See page
Only one headlight comes on.
1. Bulb
2. *Light Control ECU
3. Wire Harness
–
–
–
”LO–Beam” does not light (All).
1. Headlight Control Relay
2. *Light Control ECU
3. Wire Harness
–
–
”LO–Beam” does not light (One side).
1. Bulb
2. H–LP L–LWR Fuse
3. H–LP R–LWR Fuse
4. *Light Control ECU
5. Wire Harness
–
–
–
”HI–Beam” does not light (All).
1. Headlight Dimmer Switch
2. Wire Harness
–
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст