Lexus LS400 (2000 year). Service manual - part 46

BE0D8–01

I03461

Transponder Key
Coil

Transponder Key
Amplifier

ECM

–

BE–253

2116

LOCATION

BE0D9–01

N17185

BE–254

–

2117

INSPECTION

INSPECTION TRANSPONDER KEY COIL CONTINUITY
Check that there is continuity between terminal 1 and 2.
If continuity is not as specified, replace the coil.

BE0DA–01

I03238

Engine Room Junction Block

 Horn Relay

 HORN Fuse

Horn

Horn Switch

–

BE–255

2118

HORN SYSTEM

LOCATION

BE0DB–01

N13360

I03247

6

I03248

Z08505

2

3

1

BE–256

–

2119

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 there is no continuity between terminal 6 of the
connector and body ground.

(g)

Check that there is continuity 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 RELAY CONTINUITY

Condition

Tester connection

Specified condition

Constant

1 – 2

Continuity

Apply B+ between

terminals 1 and 2.

2 – 3

Continuity

If continuity is not as specified, replace the relay.