Lexus ES300 (1997 year). Manual — part 173
BE04Y–02
N21562
Hi beam
AUTO
HEAD
TAIL
OFF
Flash
7
8
17
16
14 13
12
N21563
Wire Harness Side
2
1
3 4 5
6
7 8
13 14 15 16
9 10 11 12
17
–
BODY ELECTRICAL
HEADLIGHT AND TAILLIGHT SYSTEM
BE–27
1411
1997 LEXUS ES300 (RM511U)
INSPECTION
1.
INSPECT LIGHT CONTROL SWITCH CONTINUITY
Switch position
Tester connection
Specified condition
OFF
–
No continuity
TAIL
14 – 16
Continuity
HEAD
13 – 14 – 16
Continuity
AUTO
12 – 16
Continuity
If continuity is not as specified, replace the switch.
2.
INSPECT HEADLIGHT DIMMER SWITCH CONTINU-
ITY
Switch position
Tester connection
Specified condition
Low beam
16 – 17
Continuity
High beam
7 – 16
Continuity
Flash
7 – 8 – 16
Continuity
If continuity is not as specified, replace the switch.
3.
INSPECT COMBINATION SWITCH CIRCUIT
Connect the wire harness side connector to the combination
switch and inspect wire harness side connector from the back
side.
Light Control Switch:
Tester connection
Condition
Specified condition
16 – Ground
Constant
Continuity
12 – Ground
Light control switch OFF, TAIL or HEAD
No voltage
12 – Ground
Light control switch AUTO
Battery positive voltage
13 – Ground
Light control switch OFF or TAIL
No voltage
13 – Ground
Light control switch HEAD
Battery positive voltage
14 – Ground
Light control switch OFF
No voltage
14 – Ground
Light control switch TAIL or HEAD
Battery positive voltage
Z09181
3
4
3
4
1
2
2
1
N14863
1
2
3
5
5
3
1
2
N21564
Wire Harness Side
1
2
3
4
5 6
7
8
9 10
h–10–1–A
BE–28
–
BODY ELECTRICAL
HEADLIGHT AND TAILLIGHT SYSTEM
1412
1997 LEXUS ES300 (RM511U)
Headlight Dimmer Switch:
Tester connection
Condition
Specified condition
7 – Ground
Headlight dimmer switch Low Beam
No voltage
7 – Ground
Headlight dimmer switch High Beam or Flash
Battery positive voltage
8 – Ground
Headlight dimmer switch Low Beam or High
Beam
No voltage
8 – Ground
Headlight dimmer switch Flash
Battery positive voltage
17– Ground
Headlight dimmer switch High Beam or Flash
No voltage
17– Ground
Headlight dimmer switch Low Beam
Battery positive voltage
If the circuit is not as specified, inspect the circuit connected to
other parts.
4.
INSPECT HEADLIGHT CONTROL RELAY CONTINU-
ITY
Condition
Tester connection
Specified condition
Constant
3 – 4
Continuity
Apply B+ between
terminals 3 and 4.
1 – 2
Continuity
If continuity is not as specified, replace the relay.
5.
INSPECT HEADLIGHT CONTROL RELAY CIRCUIT
(See page
)
6.
INSPECT TAILLIGHT CONTROL RELAY CONTINUITY
Condition
Tester connection
Specified condition
Constant
1 – 2
Continuity
Apply B+ between
terminals 1 and 2.
3 – 5
Continuity
If continuity is not as specified, replace the relay.
7.
INSPECT TAILLIGHT CONTROL RELAY CIRCUIT
(See page
8.
INSPECT DAYTIME RUNNING LIGHT RELAY CIRCUIT
Disconnect the connector from the relay and inspect the con-
nector on the wire harness side.
Z08523
1
2
3
4
1
2
3
4
N14863
1
2
3
5
5
2
3
1
–
BODY ELECTRICAL
HEADLIGHT AND TAILLIGHT SYSTEM
BE–29
1413
1997 LEXUS ES300 (RM511U)
Tester connection
Condition
Specified condition
2 – Ground
Light control switch position OFF or TAIL
No continuity
2 – Ground
Light control switch position HEAD
Continuity
4 – Ground
Parking brake switch position OFF
(Parking brake lever released)
No continuity
4 – Ground
Parking brake switch position ON
(Parking brake lever pulled up)
Continuity
6 – Ground
Constant
Continuity
8 – Ground
Headlight dimmer switch position
Low beam
No continuity
8 – Ground
Headlight dimmer switch position
High beam or Flash
Continuity
10 – Ground
Brake fluid level warning switch position OFF
No continuity
10 – Ground
Brake fluid level warning switch position ON
Continuity
1 – Ground
Ignition switch position LOCK or ACC
No voltage
1 – Ground
Ignition switch position ON or START
Battery positive voltage
5 – Ground
Engine Stop
No voltage
5 – Ground
Engine Running
Battery positive voltage
7 – Ground
Constant
Battery positive voltage
9 – Ground
Constant
Battery positive voltage
If circuit is as specified, try replacing the relay with a new one.
If circuit is not as specified, inspect the circuits connected to oth-
er parts.
9.
INSPECT HEADLIGHT DIMMER RELAY CONTINUITY
Condition
Tester connection
Specified condition
Constant
1 – 4, 2 – 4
Continuity
Apply B+ between
terminals 2 and 4.
3 – 4
Continuity
If continuity is not as specified, replace the relay.
10.
INSPECT HEADLIGHT DIMMER RELAY CIRCUIT
(See page
)
11.
INSPECT DAYTIME RUNNING LIGHT NO.3 RELAY
CONTINUITY
Condition
Tester connection
Specified condition
Constant
1 – 2
Continuity
Apply B+ between
terminals 1 and 2.
3 – 5
Continuity
If continuity is not as specified, replace the relay.
Z08559
2
1
3
4
4
3
2
1
BE1838
BE1840
N21565
N21566
BE–30
–
BODY ELECTRICAL
HEADLIGHT AND TAILLIGHT SYSTEM
1414
1997 LEXUS ES300 (RM511U)
12.
INSPECT DAYTIME RUNNING LIGHT NO.3 RELAY
CIRCUIT
(See page
)
13.
INSPECT DAYTIME RUNNING LIGHT NO.4 RELAY
CONTINUITY
Condition
Tester connection
Specified condition
Constant
3 – 4
Continuity
Apply B+ between
terminals 3 and 4.
1 – 2
Continuity
If continuity is not as specified, replace the relay.
14.
INSPECT DAYTIME RUNNING LIGHT NO.4 RELAY
CIRCUIT
(See page
)
15.
INSPECT LIGHT AUTO TURN OFF SYSTEM
(See Integration relay circuit on page
)
16.
Auto ON:
INSPECT AUTOMATIC LIGHT CONTROL
(a)
Turn the ignition switch ON.
(b)
Turn the light control switch to AUTO.
(c)
Gradually cover the top of the sensor.
(d)
Verify that the accessory lights and the headlights turn
ON.
17.
Auto OFF:
INSPECT AUTOMATIC LIGHT CONTROL
(a)
Gradually expose the sensor.
(b)
Verify that the headlights and the accessory lights turn
OFF.
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