Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 04 05 202xg cilt70
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05-1 139
DIAGNOSTICS - LIGHTING SYSTEM 05BVP-01
HEADLIGHT RELAY CIRCUIT
CIRCUIT DESCRIPTION
The Multiplex network body ECU controls HEAD relay when signal is received from headlamp dimmer switch
assy.
WIRING DIAGRAM
Multiplex Network
Body ECU
Driver Side
Engine Room Junction Block Assy Junction Block
HEAD Relay
6 10
O
2C 1C HRLY
1 2 8
1 MAIN 1
W To
2D 2G
1 2 5 3 DRL Relay
6 H-LP LL
R
2F
8 H-LP RL
2F
H4
Headlight Control ECU RH
R-W(*2) W-B(*2)
2 1
H8 J27
Headlamp Assy RH (Low) J/C
R-W(*1) W-B(*1) W-B
2 1 A A
H6
Headlamp Assy LH (Low)
R(*1) W-B(*1)
2 1
J2 H3
J/C Headlight Control ECU LH
R R(*2) W-B(*2)
B B 2 1
Fusible Link Block W-B
1 1 FL MAIN
W W
F8 F6
Battery ED EA
*1: w/o HID
*2: w/ HID E68125
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1322
05-1 140
DIAGNOSTICS - LIGHTING SYSTEM
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 in the case of using the hand-held tester, and start from step 2 in the case
of not using the hand-held tester.
1 PERFORM ACTIVE TEST USING HAND-HELD TESTER
(a) Connect the hand-held tester to DLC3.
(b) Turn the ignition switch ON and push the hand-held tester main switch ON.
(c) Select the item below in the ACTIVE TEST and then check that the relay operates.
BODY NO.1:
Item Test Details Diagnostic Note
HEAD LIGHT Turn Headlight relay ON/OFF -
OK PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN ON PROBLEM SYMPTOMS TABLE
(See page 05-1 131)
NG
2 INSPECT HEADLAMP RELAY
(a) Inspect headlamp relay continuity.
Standard:
Condition Tester connection Specified condition
Always 1-2 Continuity
Always 3-5 No continuity
Apply B+ between
3-5 Continuity
the terminal 1 and 2
NG REPLACE HEADLAMP RELAY
E64835
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1323
05-1 141
DIAGNOSTICS - LIGHTING SYSTEM
3 INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSY
(a) Measure voltage between the terminal as shown in the chart below.
Standard:
Tester connection Condition Specified voltage (V)
1C-10 - Body ground Light control switch OFF ON Below 1 V 10 to 14 V
1C
E67348
NG PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN ON PROBLEM SYMPTOMS TABLE
(See page 05-1 131)
OK
REPAIR OR REPLACE HARNESS OR CONNECTOR
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1324
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