Lexus GS300/400 (2000 year). Manual — part 95

I04080

Connector
”O”, ”P”, ”Q”, ”R”

BE–94

–

BODY ELECTRICAL

COMBINATION METER

2395

F5 (–) – F12 (+)

A/T shift indicator light (R)

Continuity

F2 (–) – F12 (+)

A/T shift indicator light (N)

Continuity

F1 (–) – F12 (+)

A/T shift indicator light (D)

Continuity

G1 (+) – G5 (–)

Left turn signal indicator light

Continuity

G6 (+) – G5 (–)

Right turn signal indicator light

Continuity

If circuit is not as specified, replace the bulb or circuit plate.

3.

INSPECT COMBINATION METER CIRCUIT PLATE
From combination meter ECU to gauges:

Terminal

Resistance (

Ω

)

O1 – O3

(Engine coolant temperature receiver gauge)

Approx. 164.2

O2 – O4

(Engine coolant temperature receiver gauge)

Approx. 151.8

P1 – P4 (Tachometer)

Approx. 164.2

P2 – P3 (Tachometer)

Approx. 151.8

Q1 – Q4 (Speedometer)

Approx. 164.2

Q2 – Q3 (Speedometer)

Approx. 151.8

R1 – R4 (Fuel receiver gauge)

Approx. 164.2

R2 – R3 (Fuel receiver gauge)

Approx. 151.8

If circuit is not as specified, inspect the gauge or meter.
Then recheck system.
If circuit is not as specified, replace the circuit plate.

I04081

Connector ”G”

Connector ”U”

I04082

–

BODY ELECTRICAL

COMBINATION METER

BE–95

2396

4.

INSPECT COMBINATION METER CIRCUIT PLATE
From combination meter ECU to telltale light assem-
bly:

Disconnect connector ”G” and ”U” from the meter circuit plate
and inspect the connectors on the wire harness side as follows.

Tester connection

Specified condition

G1 – U9

Continuity

G3 – U1

Continuity

G5 – U10

Continuity

G6 – U4

Continuity

G7 – U3

Continuity

G8 – U8

Continuity

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

5.

INSPECT TELLTALE LIGHT ASSEMBLY CONTINUITY

Switch position

Tester connection

Condition

ODO/ TRIP switch Free

3 – 10

No continuity

ODO/ TRIP switch

Pushed in

3 – 10

Continuity

RESET switch Free

8 – 10

No continuity

RESET switch Pushed in

8 – 10

Continuity

Turn signal switch RIGHT

4 – 10

Continuity

Turn signal switch LEFT

9 – 10

Continuity

If continuity is not as specified, replace the telltale light assem-
bly.

I04084

A

D

C

B

BE–96

–

BODY ELECTRICAL

COMBINATION METER

2397

6.

INSPECT SPEEDOMETER ON–VEHICLE

Using a speedometer tester, inspect the speedometer for allow-
able indication error and check the operation of the odometer.
HINT:
Tire wear and tire over or under inflation will increase the indica-
tion error.

USA (mph)

CANADA (km/h)

Standard indication

Allowable range

Standard indication

Allowable range

20

18 – 24

20

17 – 24

40

38 – 44

40

38 – 46

60

56 – 66

60

57.5 – 67

80

78 – 88

80

77 – 88

100

98 – 110

100

96 – 109

120

118 – 132

120

115 – 130

140

134 – 151.5

160

153 – 173

If error is excessive, replace the speedometer.

7.

INSPECT SPEEDOMETER RESISTANCE

Measure the resistance between terminals with fixing pointer to
the stopper.

Tester connection

Resistance (

Ω

)

A – B

140 – 185

C – D

130 – 175

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

8.

INSPECT TACHOMETER/
ON–VEHICLE

(a)

Connect a tune–up test tachometer, and start the engine.

NOTICE:

Reversing the connection of the tachometer will dam-
age the transistors and diodes inside.

When removing or installing the tachometer, be care-
ful not to drop or subject it to heavy shocks.

(b)

Compare the tester and tachometer indications.

DC 13.5 V 25

°

C at (77

°

F)

Standard indication

Allowable range

700

630 – 770

1,000

900 – 1,100

2,000

1,850 – 2,150

3,000

2,800 – 3,200

4,000

3,800 – 4,200

5,000

4,800 – 5,200

6,000

5,750 – 6,250

7,000

6,700 – 7,300

I04085

A

D

C

B

I04086

Fuel Receiver Gauge

Battery

Ignition
Switch

Main
Sender
Gauge

Wire Harness
Side

I04087

Battery

Ignition
Switch

Fuel Receiver Gauge

Wire Harness
Side

Sub
Sender
Gauge

1 2

I04089

A

D

C

B

I04090

F

1/2

E

3

2

–

BODY ELECTRICAL

COMBINATION METER

BE–97

2398

9.

INSPECT TACHOMETER RESISTANCE

Measure the resistance between terminals with fixing pointer to
the stopper.

Tester connection

Resistance (

Ω

)

A – B

140 – 185

C – D

130 – 175

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

10.

INSPECT FUEL RECEIVER GAUGE OPERATION
(See page

DI–752

)

(a)

Disconnect the connector from the main sender gauge.

(b)

Turn the ignition switch ON, check that the receiver gauge
needle indicates EMPTY.

(c)

Connect the main sender gauge.

(d)

Disconnect the connector from the sub sender gauge.

(e)

Turn the ignition switch ON, check that the receiver gauge
needle indicates EMPTY.

HINT:
Because of the silicon oil in the gauge, it will take a short time
for needle to stabilize.
If operation is not as specified, inspect the receiver gauge resis-
tance.

11.

INSPECT FUEL RECEIVER GAUGE RESISTANCE

Measure the resistance between terminals with fixing pointer to
the stopper.

Tester connection

Resistance (

Ω

)

A – B

140 – 185

C – D

130 – 175

If resistance value is not as specified, replace the receiver
gauge.

12.

INSPECT FUEL MAIN SENDER GAUGE RESISTANCE

Measure the resistance between terminals 1 and 2 for each
float position.

Float position mm (in.)

Resistance (

Ω

)

F: Approx. 34.6 (1.36)

±

3 (0.12)

Approx. 2.0

±

1.0

1/2: Approx. 52.4 (2.06)

±

3 (0.12)

Approx. 26.1

±

3.0

E: Approx.

134.9 (5.31) ±

3 (0.12)

Approx. 48.7

±

1.0

If resistance value is not as specified, replace the main sender
gauge.