Lexus GS300/400 (2000 year). Service manual — part 84

BE0HP–02

I03440

1

2

3

4

5

6

I05442

Wire Harness Side

BE–50

–

BODY ELECTRICAL

HEADLIGHT BEAM LEVEL CONTROL SYSTEM

2351

INSPECTION

1.

INSPECT HEADLIGHT BEAM LEVEL CONTROL AC-
TUATOR RESISTANCE

(a)

Check that continuity exists between terminals 2 and 5.

(b)

Check that resistance exists between terminals, as
shown in the chart.

Terminal

Resistance (

Ω

)

2 – 1

26 – 30

2 – 3

26 – 30

2 – 4

26 – 30

2 – 6

26 – 30

5 – 1

26 – 30

5 – 3

26 – 30

5 – 4

26 – 30

5 – 6

26 – 30

If resistance value is not as specified, replace the actuator.

2.

INSPECT HEADLIGHT BEAM LEVEL CONTROL ECU
CIRCUIT
Connector disconnected:

Disconnect the connector from the ECU and inspect the con-
nector on the wire harness side, as shown.

Tester connection

Condition

Specified condition

A1 – A5

Ignition switch OFF

26 – 30

Ω

A1 – A6

Ignition switch OFF

26 – 30

Ω

A1 – A7

Ignition switch OFF

26 – 30

Ω

A1 – A8

Ignition switch OFF

26 – 30

Ω

A4 – B4

Ignition switch ON and light control switch HEAD

Below 1.5 V

B1 – B3

Ignition switch OFF

3.5 – 6.5 k

Ω

B5 – B7

Ignition switch OFF

3.5 – 6.5 k

Ω

A4 – Ground

Ignition switch OFF

Continuity

If circuit is not as specified, perform the inspection on the follow-
ing pages.

I05442

I05441

13 m sec./ Division

Motor operating

5V
/ Division

GND

Pulse generation

–

BODY ELECTRICAL

HEADLIGHT BEAM LEVEL CONTROL SYSTEM

BE–51

2352

3.

INSPECT HEADLIGHT BEAM LEVEL CONTROL ECU
CIRCUIT
Connector connected:

Connect the connector from the ECU and inspect the connec-
tor, as shown in the table.

Tester connection

Condition

Specified condition

A1 – A4

Ignition switch ON

Battery positive voltage

A1 – A5

Ignition switch ON, when stopping and bouncing

the vehicle.

Pulse generation

A1 – A6

Ignition switch ON, when stopping and bouncing

the vehicle.

Pulse generation

A1 – A7

Ignition switch ON, when stopping and bouncing

the vehicle.

Pulse generation

A1 – A8

Ignition switch ON, when stopping and bouncing

the vehicle.

Pulse generation

B2 – B3

Ignition switch ON

Approx. 2.5 V

B6 – B7

Ignition switch ON

Approx. 2.5 V

B1 – B3

B5 – B7

Ignition switch ON

5 V

If the circuit is not as specified, replace the ECU.

Reference INSPECTION USING OSCILLOSCOPE
HINT:
The correct waveform is as shown in the illustration.

BE0H2–08

I01352

Front Fog Lights

Combination Switch

Front Fog Light Switch

Driver Side Junction Block

FOG Fuse

Fog Light Relay

Body ECU No.2

BE–52

–

BODY ELECTRICAL

FOG LIGHT SYSTEM

2353

FOG LIGHT 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”.

I04040

ON

OFF

BE0H3–02

I04034

Wire Harness Side

11

–

BODY ELECTRICAL

FOG LIGHT SYSTEM

BE–53

2354

INSPECTION

1.

INSPECT FOG LIGHT SWITCH CONTINUITY

Switch position

Tester connection

Specified condition

OFF

–

No continuity

ON

11 – 12

Continuity

If continuity is not as specified, replace the switch.

2.

INSPECT FOG LIGHT SWITCH CIRCUIT
Connector disconnected:
(See page

DI–832

)

Disconnect the connector from the switch and inspect the con-
nector on the wire harness side, as shown.

Tester connection

Condition

Specified condition

11 – Ground

Light control switch TAIL or HEAD and dimmer

switch LOW or HI

Continuity

If circuit is not as specified, inspect the wire harness.