Lexus GS300/400 (2000 year). Manual - part 66

I05036

–

BODY ELECTRICAL

POWER SOURCE

BE–27

2328

5.

INSPECT PASSENGER SIDE JUNCTION BLOCK CIR-
CUIT

BE–28

–

BODY ELECTRICAL

POWER SOURCE

2329

(a)

Remove the fuse from the junction block and inspect the
connector on junction block side.

Fuse

Tester  connection

Condition

Specified  condition

DEF

1 – Ground

Constant

Battery positive voltage

MIR HTR

7 – Ground

Ignition switch ON

Battery positive voltage

S/ROOF

13 – Ground

Constant

Battery positive voltage

P FR DOOR

15 – Ground

Constant

Battery positive voltage

P/SEAT (P)

23 – Ground

Constant

Battery positive voltage

DOME

25 – Ground

Constant

Battery positive voltage

S–HTR

27 – Ground

Ignition switch ON

Battery positive voltage

TV

31 – Ground

Constant

Battery positive voltage

ECU–B2

33 – Ground

Constant

Battery positive voltage

P FR DOOR

41 – Ground

Constant

Battery positive voltage

If the circuit is not as specified, inspect the circuits connected
to other parts.
(b)

Remove the relay from the junction block and inspect the
connector on junction block side.

Relay

Tester  connection

Condition

Specified  condition

Ignition Main

43 – Ground

Ignition switch ON

Battery positive voltage

Mirror Heater

47 – Ground

Ignition switch ON

Battery positive voltage

Mirror Heater

50 – Ground

Constant

Battery positive voltage

If the circuit is not as specified, inspect the circuits connected
to other parts.

I05029

1

2

3

4

5

6

7

8

9

10

–

BODY ELECTRICAL

POWER SOURCE

BE–29

2330

6.

INSPECT PASSENGER COWL SIDE RELAY BLOCK
CIRCUIT

Remove the relay from the relay block and inspect the connec-
tor on relay block side.

Relay

Tester  connection

Condition

Specified  condition

DEF

1 – Ground

Constant

Battery positive voltage

HEATER

6 – Ground

Constant

Battery positive voltage

If the circuit is not as specified, inspect the circuits connected
to other parts.

BE0GD–10

I01372

Ignition Switch

Radio Assembly

Tweeter

Front Speakers

Rear Speakers

Tweeter

Radio Assembly

LEXUS Navigatioin
System

Woofer

Power Amplifier
(NAKAMICHI made)

Driver Side Junction Block

 RAD NO.2 Fuse

Engine Room No.1
Junction Block

 ECU–B1 Fuse

 RAD NO.1 Fuse

Passenger Side
Junction Block

 DOME Fuse

CD Auto Changer

CD Magazine

Power Amplifier
(PIONEER made)

BE–216

–

BODY ELECTRICAL

AUDIO SYSTEM

2517

LOCATION



The vehicle shown in this illustration is ”GS400”.



All components of ”GS300” other than the ones used for engine are same as ”GS400”.