Lexus LS400 (2000 year). Manual — part 25

BE0CN–01

I03406

Engine Room Junction Block

HORN Fuse

Ignition Switch

Tilt & Telescopic ECU

Body ECU

Driver Door ECU

Front Passenger Door ECU

Driving Position Memory
& Return Switches

Instrument Panel Junction Block

RADIO No.2 Fuse

–

BE–181

2044

POWER MIRROR CONTROL SYSTEM

LOCATION

BE11W–01

I04167

Left/Right Adjustment Switch

Mirror Switch

9

7

6

5

8

N13659

6

5

I09236

RETURN RETRACT

2

1

I09237

4

3

BE–182

–

BODY ELECTRICAL

POWER MIRROR CONTROL SYSTEM

2045

INSPECTION

1.

INSPECT MIRROR SWITCH CONTINUITY

Switch position

Tester connection

Resistance (

Ω

)

LEFT

8 – 9

100

RIGHT

8 – 9

0

Illumination

5 – 6

Continuity

If continuity is not as specified, replace the switch.
2.

INSPECT MIRROR SWITCH RESISTANCE

Measure resistance between terminals 7 and 9 at each switch
position, as shown in the chart.

Switch position

Resistance (

Ω

)

UP

Approx. 100

RIGHT

250

DOWN

470

LEFT

800

If resistance is not as specified, replace the switch.
3.

INSPECT MIRROR SWITCH CIRCUIT
(See page

DI–452

)

4.

INSPECT MIRROR SWITCH INDICATOR LIGHT OP-
ERATION

Connect the positive (+) lead from the battery to terminal 5 and
the negative (–) lead to terminal 6, and check that the indicator
light does not light up, replace the switch.

5.

CANADA and TAIWAN models only:
INSPECT RETRACT SWITCH CONTINUITY

Switch position

Tester connection

Specified condition

RETURN

–

No continuity

RETRACT

1 – 2

Continuity

6.

CANADA and TAIWAN models only:
INSPECT RETRACT SWITCH INDICATOR OPERA-
TION

Connect the positive (+) lead from the battery to terminal 4 and
negative (–) lead to terminal3 and check that the indicator does
no light up, replace the switch.

N13476

N13477

I04601

12

11

12

11

I04602

11

10

11

10

I04605

7

6

11

13

10

–

BODY ELECTRICAL

POWER MIRROR CONTROL SYSTEM

BE–183

2046

7.

INSPECT MIRROR MOTOR OPERATION
w/o Driving position memory:

(a)

Connect the positive (+) lead from the battery to terminal
6 and negative (–) lead to terminal 5, then check that the
mirror turns to left side.

(b)

Reverse the polarity and check that the mirror turns to
right side.

(c)

Connect the positive (+) lead from the battery to terminal
4 and negative (–) lead to terminal 5, then check that the
mirror turns upward.

(d)

Reverse the polarity and check that the mirror turns down-
ward.

8.

INSPECT MIRROR MOTOR OPERATION
w/ Driving position memory:

(a)

Connect the positive (+) lead from the battery to terminal
11 and negative (–) lead to terminal 12, then check that
the mirror turns to left side.

(b)

Reverse the polarity and check that the mirror turns to
right side.

(c)

Connect the positive (+) lead from the battery to terminal
11 and negative (–) lead to terminal 10, then check that
the mirror turns upward.

(d)

Reverse the polarity and check that the mirror turns down-
ward.

9.

INSPECT MIRROR POSITION SENSORS

HINT:
Strip off the vinyl tape of the connector and remove terminals
6, 7, 10, 11, 12, 13 and 14 from the connector housing.
(a)

Connect a series of three 1.5 V dry cell batteries.

(b)

Connect the positive (+) lead from the dry cell batteries to
terminal 7 and the negative (–) lead to terminal 6.

(c)

Connect the positive (+) lead from the voltmeter to termi-
nal 13 and the negative (–) lead to terminal 6.

I04606

7

6

11

13

10

I04607

7

6

12

14

11

I04608

7

6

12

14

11

N13484

SW1

SW2

SET Switch

BE–184

–

BODY ELECTRICAL

POWER MIRROR CONTROL SYSTEM

2047

(d)

Apply battery positive voltage to terminals 10 and 11, then
check that the voltage gradually changes according to the
table below while the mirror moves between the upper-
most position and lowermost position.

Mirror

position

Lowermost

Mirror

position

Uppermost

Voltage

2.8 – 5.0

Changes

gradually

0 – 0.9

If voltage value is not as specified, replace the motor assembly.

(e)

Disconnect the 4 leads of the battery and voltmeter.

(f)

Connect the positive (+) lead from the voltmeter to termi-
nal 14 and negative (–) lead to terminal 6.

(g)

Apply battery positive voltage to terminals 11 and 12, then
inspect that the voltage gradually changes according to
the table below while the mirror moves between the left–
most position and right–most position.

Mirror

position

Left–most

Mirror

position

Right–most

Voltage

LEFT

2.8 – 5.0

Changes

gradually

0 – 0.9

Voltage

RIGHT

0 – 0.9

Changes

gradually

2.8 –5.0

If voltage value is not as specified, replace the motor assembly.

10.

INSPECT DRIVING POSITION MEMORY AND RE-
TURN SWITCH CONTINUITY

Switch position

Tester connection

Specified condition

SET switch ON

3 – 4

Continuity

Return SW1 ON

3 – 7

Continuity

Return SW2 ON

3 – 6

Continuity

If continuity is not as specified, replace the switch.
If continuity is as specified, inspect the switch circuit.
11.

INSPECT DRIVING POSITION MEMORY AND RE-
TURN SWITCH CIRCUIT (See page

DI–755

)