Normal Lighting Operation; Light Auto Turn Off Operation - Toyota Camry 1999 Electrical Troubleshooting Manual

SYSTEM OUTLINE
With the ignition SW turned on, the current flows to TERMINAL 7 of the integration relay through GAUGE fuse.
Voltage is applied at all times to TERMINAL (C) 2 of the integration relay through the taillight relay coil side, and to
TERMINAL (C) 3 through the HEAD relay coil side (w/o daytime running light) or through the daytime running light relay
(Main) (w/ daytime running light).

1. NORMAL LIGHTING OPERATION

<Turn taillight on>
With the light control SW turned to TAIL position, a signal is input into TERMINAL (C) 1 of the integration relay. Due to this
signal, the current flowing to TERMINAL (C) 2 of the relay flows to TERMINAL (C) 1 to TERMINAL 14 of the light control SW
to TERMINAL 16 to GROUND, and taillight relay causes taillights to turn on.
<Turn headlight on>
With the light control SW turned to HEAD position, a signal is input into TERMINALS (C) 1 and (C) 4 of the integration relay.
Due to this signal, the current flowing to TERMINAL (C) 3 of the relay flows to TERMINAL (C) 4 to TERMINAL 13 of the light
control SW to TERMINAL 16 to GROUND in the headlight circuit, and causes taillight and HEAD relay to turn the lights on.
The taillight circuit is same as above.

2. LIGHT AUTO TURN OFF OPERATION

With light on and ignition SW turned off (Input signal goes to TERMINAL 7 of the relay), when the driver's door is opened
(Input signal goes to TERMINAL 6 of the relay), the relay operates and the current is cut off which flows from TERMINAL (C)
2 of the relay to TERMINAL (C) 1 In taillight circuit and from TERMINAL (C) 3 to TERMINAL (C) 4 in headlight circuit.
As a result, all lights are turned off automatically.
SERVICE HINTS
HEAD RELAY [ENGINE ROOM J/B NO.2]
2–1 : Closed with the light control SW at HEAD position or the dimmer SW at FLASH position
Closed with the engine running and the parking brake lever released (w/ daytime running light)
TAILLIGHT RELAY [INSTRUMENT PANEL J/B]
3–5 : Closed with the light control SW at TAIL or HEAD position
D12 DOOR COURTESY SW FRONT LH
1–GROUND : Continuity with the front LH door open
I17 (C) INTEGRATION RELAY
7–GROUND : Approx. 12 volts with the ignition SW at ON position
6–GROUND : Continuity with the front LH door open
1–GROUND : Always approx. 12 volts
10–GROUND : Always continuity
(C) 2–GROUND : Always approx. 12 volts
(C) 3–GROUND : Always approx. 12 volts
(C) 4–GROUND : Continuity with the light control SW at HEAD position
(C) 1–GROUND : Continuity with the light control SW at TAIL or HEAD position
: PARTS LOCATION
Code See Page
C13 30
A 30
D6 D6
B 30
D12 32
26 (1MZ–FE)
F4 F4 A A
28 (5S–FE)
Code See Page
26 (1MZ–FE)
F6 F6 C C
28 (5S–FE)
26 (1MZ–FE)
F9 F9 F F
28 (5S–FE)
I17 C 30
J1 31
Code See Page
J2 31
J7 31
J11 31
J32 31