TOYOTA RAV4 2006 Service Repair Manual

LI–30LIGHTING – LIGHTING SYSTEM
LI
DESCRIPTION
When the light control switch, located on the headlight dimmer switch, is turned to the HEAD position, the
HEAD relay illuminates the headlights.
WIRING DIAGRAM
INSPECTION PROCEDURE
(a) Connect the intelligent tester (with CAN VIM) to the
DLC3.
(b) Turn the ignition switch ON and press the intelligent
tester main switch ON.
(c) Select the item below in the ACTIVE TEST and then
check the relay operation.
Headlight Relay Circuit
1PERFORM ACTIVE TEST BY INTELLIGENT TESTER (HEADLIGHT)
B118193E04

LIGHTING – LIGHTING SYSTEMLI–31
LI
Main body ECU
OK:
Headlight comes on
OK
NG
(a) Remove the HEAD LL fuse and HEAD RL fuse from the
engine room No. 2 relay block.
(b) Measure the resistance of the fuses.
Standard resistance:
Below 1
NG
OK
(a) Remove the headlight relay from the engine room No. 2
relay block.
(b) Measure the resistance of the relay.
Standard resistance
NG
OK
(a) Remove the headlight bulbs (LOW).
(b) Connect the positive (+) lead from the battery to terminal
2 and the negative (-) lead to terminal 1, then check that
the bulb illuminates.
OK:
Bulb illuminates.
NG
Item Test Details: Display (Range) Diagnostic Note
HEAD LIGHT Headlight Relay ON/OFF -
Go to step 7
2INSPECT FUSE (HEAD LL, HEAD RL)
REPLACE FUSE
3INSPECT HEADLIGHT RELAY (Marking: HEAD)
B112776E03
Tester Connection Specified Condition
3 - 5 10 k
or higher
3 - 5 Below 1
(Battery voltage applied to terminals
1 and 2)
REPLACE HEADLIGHT RELAY
4INSPECT BULB (HEADLIGHT BULB)
C128856E01
REPLACE BULB

LI–32LIGHTING – LIGHTING SYSTEM
LI
OK
(a) Disconnect the E15 main body ECU connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage
NG
OK
(a) Measure the voltage of the main body ECU.
Standard voltage
NG
OK
5CHECK WIRE HARNESS (MAIN BODY ECU - BATTERY)
E114538E17
Tester Connection Specified Condition
E15-20 (HRLY) - Body ground 10 to 14 V
REPAIR OR REPLACE HARNESS AND
CONNECTOR
6CHECK INSTRUMENT PANEL JUNCTION BLOCK (MAIN BODY ECU)
B118233E03
Tester Connection Condition Specified Condition
E15-20 (HRLY) - Body
groundLight control switch
OFF10 to 14 V
E15-20 (HRLY) - Body
groundLight control switch
HEADBelow 1 V
REPLACE INSTRUMENT PANEL JUNCTION
BLOCK (MAIN BODY ECU)
REPAIR OR REPLACE HARNESS AND CONNECTOR (HEAD RELAY - HEADLIGHT BULB AND
BODY GROUND)

LIGHTING – LIGHTING SYSTEMLI–33
LI
(a) Disconnect the E17 main body ECU connector.
(b) Disconnect the E12 headlight dimmer switch connector.
(c) Measure the resistance of the wire harness side
connectors.
Standard resistance
NG
OK
(a) Disconnect the E12 headlight dimmer switch.
(b) Measure the resistance of the switch.
Standard resistance
NG
7CHECK WIRE HARNESS (HEADLIGHT DIMMER SWITCH - MAIN BODY ECU)
B128083E01
Tester Connection Specified Condition
E17-12 (HEAD) - E12-20 (H) Below 1
E17-12 (HEAD) or E12-20 (H) - Body
ground10 k or higher
REPAIR OR REPLACE HARNESS AND
CONNECTOR
8INSPECT HEADLIGHT DIMMER SWITCH
E068152E09
Tester Connection Switch Condition Specified Condition
18 (T) - 12 (EL) TAIL Below 1
18 (T) - 12 (EL) OFF 10 k or higher
20 (H) - 12 (EL) HEAD Below 1
20 (H) - 12 (EL) OFF 10 k or higher
16 (HL) - 12 (EL) LOW Below 1
16 (HL) - 12 (EL) HIGH 10 k or higher
REPLACE HEADLIGHT DIMMER SWITCH
ASSEMBLY

LI–34LIGHTING – LIGHTING SYSTEM
LI
OK
REPAIR OR REPLACE HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH - BODY
GROUND)

LIGHTING – LIGHTING SYSTEMLI–35
LI
DESCRIPTION
The main body ECU controls the daytime running light No. 2 relay (Marking: DRL NO.2).
WIRING DIAGRAM
DRL Relay Circuit
B118198E03

LI–36LIGHTING – LIGHTING SYSTEM
LI
INSPECTION PROCEDURE
(a) Remove the No. 2 relay, No. 3 relay and No. 4 relay from
the engine room No. 2 relay block.
(b) Measure the resistance of the relays.
Standard resistance:
No. 2, No. 4
No. 3
NG
OK
(a) Remove the HEAD LH fuse from the engine room No. 2
relay block.
(b) Measure the resistance of the fuse.
Standard resistance:
Below 1
NG
OK
1INSPECT DAYTIME RUNNING LIGHT RELAY (Marking: DRL NO. 2, DRL NO. 3, DRL NO. 4)
B128080E04
Tester Connection Specified Condition
3 - 5 10 k
or higher
3 - 5 Below 1
(Battery voltage applied to terminals
1 and 2)
Tester Connection Specified Condition
4 - 5 Below 1
4 - 5 10 k or higher
(Battery voltage applied to terminals
1 and 2)
3 - 5 10 k
or higher
3 - 5 Below 1
(Battery voltage applied to terminals
1 and 2)
REPLACE DAYTIME RUNNING LIGHT RELAY
2INSPECT FUSE (HEAD LH)
REPLACE FUSE

LIGHTING – LIGHTING SYSTEMLI–37
LI
(a) Remove the headlight bulb (high).
(b) Connect the positive (+) lead from the battery to terminal
2 and the negative (-) lead to terminal 1, then check that
the bulb illuminates.
NG
OK
(a) Remove the No. 2 daytime running light relay from the
engine room No. 2 relay block.
(b) Measure the voltage of the relay block.
Standard voltage
NG
OK
3INSPECT HEADLIGHT BULB (HIGH)
C128857E01
REPLACE HEADLIGHT BULB (HIGH)
4CHECK WIRE HARNESS (BATTERY - NO. 2 DAYTIME RUNNING LIGHT RELAY)
B118199E04
Tester Connection Specified Condition
Relay block daytime running light
No. 2 relay terminal 5 - Body ground10 to 14 V
REPAIR OR REPLACE HARNESS AND
CONNECTOR

LI–38LIGHTING – LIGHTING SYSTEM
LI
(a) Remove the No. 2 daytime running light relay from the
engine room No. 2 relay block.
(b) Disconnect the A14 and A22 headlight (HIGH)
connectors.
(c) Measure the resistance of the wire harness side
connectors and relay block.
Standard resistance
NG
OK
(a) Disconnect the E16 main body ECU connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage
NG
OK
5CHECK WIRE HARNESS (NO. 2 DAYTIME RUNNING LIGHT RELAY - HEADLIGHT BULB
AND BODY GROUND)
B118200E09
Tester Connection Specified Condition
Relay block daytime running light
No. 2 relay terminal 3 - A14-2Below 1
A14-2 - Body ground 10 k or higher
A14-1 - A22-1 Below 1
A14-1 - Body ground 10 k or higher
A22-2 - Body ground Below 1
REPAIR OR REPLACE HARNESS AND
CONNECTOR
6CHECK WIRE HARNESS (MAIN BODY ECU - BATTERY)
B118235E01
Tester Connection Specified Condition
E16-3 (DIM) - Body ground 10 to 14 V
REPAIR OR REPLACE HARNESS AND
CONNECTOR
REPLACE INSTRUMENT PANEL JUNCTION BLOCK (MAIN BODY ECU)

LIGHTING – LIGHTING SYSTEMLI–39
LI
DESCRIPTION
The body ECU controls the headlight relay, No. 2 daytime running light relay (Marking: DRL NO. 2) and
No. 4 daytime running light relay (Marking: DRL NO. 4).
WIRING DIAGRAM
Headlight (HI-BEAM) Circuit
B118202E02