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BE-18
BODY ELECTRICAL - HEADLIGHT AND TAILLIGHT SYSTEM
BE102-02
INSPECTION
1. w/o Automatic light control system:
Hi beam
INSPECT LIGHT CONTROL SWITCH CONTINUITY
AUTO Switch position Tester connection Specified condition
OFF - No continuity
HEAD
TAIL 14 - 16 Continuity
TAIL
HEAD 13 - 14 - 16 Continuity
OFF
Flash If continuity is not as specified, replace the switch.
2. w/ Automatic light control system:
8 7
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
17 16 14 13 12
If continuity is not as specified, replace the switch.
3. INSPECT HEADLIGHT DIMMER SWITCH CONTINU-
N21562
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.
4. INSPECT HEADLIGHT CONTROL RELAY CONTINU-
ITY
2 1 Condition Tester connection Specified condition
2 1 Constant 1-2 Continuity
3 Apply B+ between
4 3-4 Continuity
terminals 1 and 2.
4 3
If continuity is not as specified, replace the relay.
Z08521
5. INSPECT TAILLIGHT CONTROL RELAY CONTINUITY
2 Condition Tester connection Specified condition
1
Constant 1-2 Continuity
3 5
Apply B+ between
5 3-5 Continuity
terminals 1 and 2.
1 2
If continuity is not as specified, replace the relay.
3
N14863
2001 SIENNA (RM787U)
Author : Date : 1536
BE-19
BODY ELECTRICAL - HEADLIGHT AND TAILLIGHT SYSTEM
6. INSPECT HEADLIGHT DIMMER RELAY CONTINUITY
Condition Tester connection Specified condition
2 1 2 1 Constant 1 - 4, 2 - 4 Continuity
Apply B+ between
3-4 Continuity
terminals 2 and 4.
4 3 If continuity is not as specified, replace the relay.
4 3
Z08523
Wire Harness Side: 7. w/ Daytime running light system:
INSPECT DAYTIME RUNNING LIGHT RELAY (MAIN)
CIRCUIT
Disconnect the connector from the relay and inspect the con-
nector on the wire harness side.
I21517
Tester connection Condition Specified condition
Light control switch position OFF or TAIL No continuity
7 - Ground Light control switch position HEAD
Continuity
(Light auto turn off not in operation)
Parking brake switch position OFF
No continuity
(Parking brake lever released)
11 - Ground
G d
Parking brake switch position ON
Continuity
(Parking brake lever pulled up)
2 - Ground Constant Continuity
Headlight dimmer switch position
No continuity
Low beam
8 - Ground
G d
Headlight dimmer switch position
Continuity
High beam or Flash
Brake fluid level warning position OFF No continuity
10 - Ground
G d
Brake fluid level warning position ON Continuity
Ignition switch position LOCK or ACC No voltage
12 - Ground
G d
Ignition switch position ON or START Battery positive voltage
3 - Ground Constant Battery positive voltage
Engine Stop No voltage
9 - Ground
G d
Engine Running 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.
2001 SIENNA (RM787U)
Author : Date : 1537
BE-20
BODY ELECTRICAL - HEADLIGHT AND TAILLIGHT SYSTEM
8. w/ Daytime running light system:
INSPECT DAYTIME RUNNING LIGHT NO.4 RELAY
CONTINUITY
2 1
2 1 Condition Tester connection Specified condition
3 4 Constant 3-4 Continuity
3 4 Apply B+ between
1-2 Continuity
terminals 3 and 4.
If continuity is not as specified, replace the relay.
Z08559
9. 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 up and the headlights turn
ON.
I19453
10. Auto OFF:
INSPECT AUTOMATIC LIGHT CONTROL
(a) Gradually expose the sensor.
(b) Verify that the headlights and the accessory lights come
OFF.
I19454
11. INSPECT LIGHT-OFF CONDITION
(a) Turn the ignition switch ON.
(b) Gradually cover the top of the sensor.
Lights auto ON:
(c) Verify that the lights will go out when light control switch
position is OFF or the area surrounding the sensor gets
bright or opening the except back door while the ignition
switch is OFF.
12. INSPECT LIGHTS-ON CONDITION
(a) Open the driver's door while the ignition switch is OFF.
(b) Turn the light control switch to AUTO leaving the door
open and cover the top of the sensor, and verify that the
lights go on when the ignition switch is turned ON.
2001 SIENNA (RM787U)
Author : Date : 1538
BE-21
BODY ELECTRICAL - HEADLIGHT AND TAILLIGHT SYSTEM
13. ADJUST AUTOMATIC LIGHT CONTROL SENSOR
(a) Adjustment of the light control is performed by turning the
sensitivity knob on the sensor.
Clockwise (b) This will determine at what light condition the automatic
control will take place.
S If response is too quick, turn the knob counterclock-
Counterclockwise
wise.
S If response is too slow, turn the knob clockwise.
I02695
14. w/ Automatic light control system:
Wire Harness Side:
INSPECT SENSOR CIRCUIT
(a) Disconnect the connector from the sensor and inspect the
connector on the wire harness side, as shown in the chart.
1234
I01254
Tester connection Condition Specified condition
3 - Ground Constant Continuity
1 - Ground Ignition switch LOCK or ACC No voltage
1 - Ground Ignition switch ON Battery positive voltage
4 - Ground Ignition switch LOCK or ACC No voltage
4 - Ground Ignition switch ON 5.2 - 9.0 V
If circuit is as specified, perform the inspection on the following
page.
If the circuit is not as specified, inspect the circuit connected to
other parts.
2001 SIENNA (RM787U)
Author : Date : 1539
BE-22
BODY ELECTRICAL - HEADLIGHT AND TAILLIGHT SYSTEM
(b) Connect the wire harness side connector to the sensor
4 1 and inspect wire harness side connector from the back
side.
HINT:
S Ignition switch ON.
S Light control switch OFF.
S Vehicle's surroundings are bright.
3 2
I01255
Tester connection Condition Specified condition
3 - Ground Constant Continuity
1 - Ground Ignition switch LOCK or ACC No voltage
1 - Ground Ignition switch ON 9.5 V or more
Vehicle is under the direct sun light.
Taillight and Headlight are ON.
(Sensor is not covered)
If circuit is as specified, try replacing the sensor with a new one.
If the circuit is not as specified, inspect the circuit connected to
other parts.
2001 SIENNA (RM787U)
Author : Date : 1540
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