Lexus SC300 / Lexus SC400. Manual — part 144
2.
INSPECT MIRROR POSITION SENSORS
HINT: Strip off the vinyl tape of the connector and remove ter-
minals 1, 2, 3, 5 and 9 from the connector housing.
(a) Connect a series of three 1.5 volt dry cell batteries.
(b) Connect the positive (+) lead from the dry cell batteries
to terminal 5 and the negative (–) lead to terminal 9.
(c) Connect the positive (+) lead from the voltmeter to
terminal 6 and the negative (–) lead to terminal 9.
(d) Apply battery voltage to terminals 2 and 3, check that
the voltage gradually changes according to the table
below while the mirror moves between the uppermost
position and lowermost position.
Mirror
position
Lowermost
Uppermost
Voltage
2.8 – 5.0
Changes
gradually
0 – 0.9
If voltage value is not as specified, replace the motor assem-
bly.
(e) Disconnect the four leads of the battery and voltmeter.
(f) Connect the positive (+) lead from the voltmeter to
terminal 4 and the negative (–) lead to terminal 9.
(g) Apply battery voltage to terminals 1 and 2n inspect that
the voltage gradually changes according to the table
below while the mirror moves between the leftmost
position and rightmost position.
Mirror
Position
Leftmost
Rightmost
Voltage
Left
Mirror
2.8 – 5.0
Changes
gradually
0 – 0.9
Voltage
Right
Mirror
0 – 0.9
Changes
gradually
2.8 – 5.0
If voltage value is not as specified, replace the motor assem-
bly.
(Mirror ECU)
REMOVAL AND INSTALLATION OF
MIRROR ECU
REMOVAL AND INSTALL MIRROR ECU
(a) Remove the No. 1 under cover .
(See page
(b) Remove the two screws and disconnect the two
connectors and then pull out the ECU.
(c) For installation, follow the removal procedure in reverse.
–
BODY ELECTRICAL SYSTEM
Power Mirror Control System
BE–187
INSPECTION OF MIRROR ECU
1.
INSPECT MIRROR ECU CIRCUIT
Disconnect the connectors from the ECU and inspect the
connector on the wire harness side as shown in the chart be-
low.
Check for
Tester connection
Condition
Specified value
Continuity
A1–A2
Constant
Continuity
A1–A3
Constant
Continuity
A8–A10
Constant
Continuity
A9–A10
Constant
Continuity
A11–Ground
Constant
Continuity
A12–A13
Constant
Continuity
A16–*
Constant
Continuity
B1–B2
Right mirror switch on DOWN
Continuity
B1–B4
Right mirror switch to RIGHT
Continuity
B1–B5
Left mirror switch to RIGHT
Continuity
B1–B6
Left mirror switch to DOWN
Continuity
B2–B3
Right mirror switch to UP
Continuity
B3–B4
Right mirror switch to LEFT
Continuity
B3–B5
Left mirror switch to LEFT
Continuity
B3–B6
Left mirror switch to UP
Continuity
Voltage
A4–Ground
Constant
Battery positive voltage
A7–Ground
Ignition switch to ACC
Battery positive voltage
A7–Ground
Ignition switch to OFF
No voltage
*: Terminal 1/18 of the Tilt and Telescopic ECU
If circuit is not as specified, inspect the wire harness and mir-
ror switch or motor assembly.
BE–188
–
BODY ELECTRICAL SYSTEM
Power Mirror Control System
2.
INSPECT MIRROR ECU OPERATION
Connect the connectors and using a voltmeter with high im-
pedance (10 k
/V minimum), measure the voltage at each
terminal and body ground.
Check for
Tester connection
Condition
Specified value
Voltage
A1–Ground
Right mirror switch to LEFT
Battery positive voltage
A2–Ground
Right mirror switch to UP
Battery positive voltage
A3–Ground
Right mirror switch to RIGHT or DOWN
Battery positive voltage
*A5–Ground
Right mirror to leftmost position
0–0.9 V
*A5–Ground
Right mirror to rightmost position
2.8–5.0 V
*A6–Ground
Right mirror to lowermost position
2.8–5.0 V
*A6–Ground
Right mirror to uppermost position
0–0.9 V
A8–Ground
Left mirror switch to RIGHT
Battery positive voltage
A9–Ground
Left mirror switch to UP
Battery positive voltage
A10–Ground
Left mirror switch to LEFT or DOWN
Battery positive voltage
A13–Ground
Right or left mirror switch to any position except
OFF
Approx. 5 V
*A14–Ground
Left mirror to leftmost position
2.8–5.0 V
*A14–Ground
Left mirror to rightmost position
0–0.9 V
*A15–Ground
Left mirror to lowermost position
2.8–5.0 V
*A15–Ground
Left mirror to uppermost position
0–0.9 V
B2–Ground
Constant
Approx. 5 V
B4–Ground
Constant
Approx. 5 V
B5–Ground
Constant
Approx. 5 V
B6–Ground
Constant
Approx. 5 V
*: Confirm that the voltage changes gradually while the mirror moves
If operation is not as specified, inspect the wire harness and
mirror switch or motor assembly. Then if these are correct, re-
place the ECU.
–
BODY ELECTRICAL SYSTEM
Power Mirror Control System
BE–189
Troubleshooting
You will find the cause of trouble more easily by properly using the table shown below. In this table, the
numbers indicate the order of priority of the causes of trouble. Check each part in the order shown. If neces-
sary, replace the part.
See page
BE–4
,20
BE–4
,21
BE–186
BE–186
–
–
BE–188
SR–60
–
–
IN–32
BE–187
Trouble
Parts
name
RADIO NO. 2 Fuse
DOME Fuse
Mirror Switch
Mirror Motor
Wire Harness
Mirror ECU
Driving Position Switch
Driving Position Switch
(Position is not set)
T
ilt and T
elescopic
ECU
Mirror Sensors
Mirror does not operate.
1
1
2
3
5
4
Mirror operates abnormally
1
2
4
3
Mirror does not return to the memorized position.
(w/ Memory System)
6
4
2
1
3
5
Mirror returns to a position which is not memorized.
(w/ Memory System)
3
1
2
BE–190
–
BODY ELECTRICAL SYSTEM
Power Mirror Control System
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