Lighting. Lighting System Terminals Of Ecu

Body Electrical. Camry. Acv40 Gsv40

Lighting. Camry. Acv40 Gsv40

CHECK MAIN BODY ECU (INSTRUMENT PANEL J/B)

CHECK HEADLIGHT BEAM LEVEL CONTROL ECU

Lighting System -- Terminals Of Ecu

CHECK MAIN BODY ECU (INSTRUMENT PANEL J/B)

Disconnect the IA, ID, IF and IM J/B connectors.

Measure the voltage and resistance between the specified terminals of the wire harness side connectors and body ground.

Standard voltage:

Symbols	Wiring Color	Terminal Description	Condition	Specified Condition
IA-1 - Body ground	B - Body ground	Battery power supply	Always	10 to 14 V
ALTB (ID-15) - Body ground	W - Body ground	Generator power supply	Always	10 to 14 V

Standard resistance:

Symbols	Wiring Color	Terminal Description	Condition	Specified Condition
GND1 (IF-10) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
GND2 (IM-9) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

If the result is not as specified, there may be a malfunction on the wire harness side.

Reconnect the IA, ID, IF, and IM J/B connectors.

Measure the resistance and voltage between the specified terminals of the J/B connectors and body ground.

Standard resistance:

Symbols	Wiring Color	Terminal Description	Condition	Specified Condition
CLTE (E6-18) - Body ground	BR - Body ground	Automatic light control sensor ground	Always	Below 1 Ω

Standard voltage:

Symbols	Wiring Color	Terminal Description	Condition	Specified Condition
HRLY (ID-3) - Body ground	P - Body ground	Headlight relay drive output	Light control switch in HEAD	Below 1 V
			Light control switch not in HEAD	10 to 14 V
DIM (ID-9) - Body ground	V - Body ground	High beam headlight relays drive output	Dimmer switch in HIGH or HIGH FLASH	Below 1 V
			Dimmer switch in LOW	10 to 14 V
HU (IG-5) - Body ground	LG - Body ground	Dimmer switch HIGH input	Dimmer switch in HIGH	10 to 14 V
			Dimmer switch in LOW	Below 1 V
ILE (II-10) - Body ground	BR - Body ground	Interior light and ignition key cylinder light drive output	Interior light and ignition key cylinder light ON	Below 1 V
			Interior light and ignition key cylinder light OFF	10 to 14 V
LCTY (IO-7) - Body ground	LG - Body ground	Rear left door courtesy switch input	Rear left door open	Below 1 V
			Rear left door closed	10 to 14 V
LSWL (IP-5) - Body ground (*5)	GR - Body ground	Rear left door lock position switch input	Rear left door locked	10 to 14 V
			Rear left door unlocked	Below 1 V
RCTY (E6-5) - Body ground (*4)	GR - Body ground	Rear right door courtesy switch input	Rear right door open	Below 1 V
			Rear right door closed	10 to 14 V
LSWR (E6-5) - Body ground (*5)	GR - Body ground	Rear right door lock position switch input	Rear right door locked	10 to 14 V
			Rear right door unlocked	Below 1 V
RCTY (E6-7) - Body ground (*4)	GR - Body ground	Rear right door courtesy switch input	Rear right door open	Below 1 V
			Rear right door closed	10 to 14 V
HEAD (E6-17) - Body ground	P- Body ground	Light control switch HEAD input	Light control switch in HEAD	Below 1 V
			Light control switch not in HEAD	10 to 14 V
CLTS (E6-19) - Body ground	G- Body ground	Automatic light control sensor signal input	Ignition switch OFF	Below 1 V
			Automatic light control system operates	Pulse generation (See waveform 1)
RFOG (E6-9) - Body ground (*3)	SB - Body ground	Fog light switch REAR input	Fog light switch in REAR	Below 1 V
			Fog light switch OFF	10 to 14 V
CLTB (E6-20) - Body ground	B - Body ground	Automatic light control sensor power supply output	Ignition switch OFF	Below 1 V
			Ignition switch ON and light control switch in AUTO	10 to 14 V
PCTY (E6-21) - Body ground	Y - Body ground (1) L - Body ground (2)	Passenger side door courtesy switch input	Passenger side door open	Below 1 V
			Passenger side door closed	10 to 14 V
LGCY (E6-25) - Body ground	W - Body ground	Luggage courtesy switch input	Luggage compartment door open	Below 1 V
			Luggage compartment door closed	10 to 14 V
LSWP (E6-27) - Body ground (*4)	GR - Body ground (1) L- Body ground (2)	Passenger side and rear door lock position switches input	Passenger side and rear LH and rear RH doors locked	10 to 14 V
			Passenger side or rear LH or rear RH door unlocked	Below 1 V
LSWP (E6-27) - Body ground (*5)	LG - Body ground (1) L - Body ground (2)	Passenger side door lock position switches input	Passenger side door locked	10 to 14 V
			Passenger side door unlocked	Below 1 V
FFOG (E6-28) - Body ground	V - Body ground	Fog light switch FRONT input	Fog light switch in FRONT	Below 1 V
			Fog light switch OFF	10 to 14 V
RCTY (E6-5) - Body ground (*1)	GR - Body ground	Rear right door courtesy switch input	Rear right door open	Below 1 V
			Rear right door closed	10 to 14 V
HF (E7-13) - Body ground	R - Body ground	Dimmer switch HIGH FLASH signal input	Dimmer switch in HIGH FLASH position	Below 1 V
			Dimmer switch not in HIGH FLASH position	10 to 14 V
A (E7-21) - Body ground	G - Body ground	Light control switch AUTO signal input	Light control switch in AUTO	Below 1 V
			Light control switch not in AUTO	10 to 14 V
TAIL (E7-23) - Body ground	B - Body ground	Light control switch TAIL signal input	Light control switch in TAIL or HEAD	Below 1 V
			Light control switch in neither TAIL nor HEAD	10 to 14 V
DCTY (E7-24) - Body ground	L - Body ground (1) Y - Body ground (2)	Driver side door courtesy switch input	Driver side door open	Below 1 V
			Driver side door closed	10 to 14 V
FFGO (E7-4) - Body ground	R - Body ground	Front fog light relay drive output	Light control switch in TAIL and fog light switch in FRONT	Below 1 V
			Fog light switch OFF	10 to 14 V
LSWD (E7-9) - Body ground	L - Body ground (1) Y - Body ground (2)	Driver side door lock position switch input	Driver side door locked	10 to 14 V
			Driver side door unlocked	Below 1 V
CANH (E8-5) - Body ground	B - Body ground	CAN communication line H	Ignition switch ON	Pulse generation
			Ignition switch OFF	Below 1 V
CANL (E8-6) - Body ground	W - Body ground	CAN communication line L	Ignition switch ON	Pulse generation
			Ignition switch OFF	Below 1 V

If the result is not as specified, the main body ECU (Instrument panel J/B) may have a malfunction.

HINT:

*1: LHD

*2: RHD

*3: with rear fog light

*4: without Entry and Start System

*5: with Entry and Start System

Waveform 1
Item
Contents
Tool setting
5 V/DIV., 5 ms./DIV.
HINT:
If the ambient light becomes brighter, width A becomes narrower.

CHECK HEADLIGHT BEAM LEVEL CONTROL ECU

Disconnect the A20 ECU connector.
Measure the voltage and resistance between the specified terminals of the wire harness side connectors and body ground.

Standard voltage:

Symbols (Terminal No.)
Wiring Color
Terminal Description
Condition
Specified Condition
IG (A20-1) - Body ground
GR - Body ground
IG power supply
Ignition switch OFF
Below 1 V
Ignition switch ON
10 to 14 V

Standard resistance:

Symbols (Terminal No.)
Wiring Color
Terminal Description
Condition
Specified Condition
E1 (A20-9) - Body ground
W - Body ground
Ground
Always
Below 1 Ω
If the result is not as specified, there may be a malfunction on the wire harness side.
Reconnect the A20 ECU connector.

Measure the resistance and voltage according to the value(s) in the table below.

Standard resistance:

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
SGR (A20-21) - E1 (A20-9)	G - W	Rear height control sensor ground	Always	Below 1 Ω
RH- (A20-23) - E1 (A20-9)	V - W	Leveling motor RH ground	Always	Below 1 Ω
LH- (A20-24) - E1 (A20-9)	GR - W	Leveling motor LH ground	Always	Below 1 Ω

Standard voltage:

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
B2 (A20-3) - E1 (A20-9)	P - W	Low beam headlight signal input	Low beam headlights ON	Below 1.5 V
			Low beam headlights OFF	Above 5 V
SPDL (A20-5) - E1 (A20-9)	W - W	Initialization signal input	Terminal LVL and terminal GND of DLC3 connected	Below 1 V
			Terminal LVL and terminal GND of DLC3 not connected	Approx. 5 V
WNG (A20-6) - E1 (A20-9)	P - W	Warning indicator drive output	Warning indicator ON	10 to 14 V
			Warning indicator OFF	Below 1 V
RH+ (A20-10) - E1 (A20-9)	R - W	Leveling motor RH power supply	Ignition switch OFF	Below 1 V
			Ignition switch ON	10 to 16 V
LH+ (A20-11) - E1 (A20-9)	Y - W	Leveling motor LH power supply	Ignition switch OFF	Below 1 V
			Ignition switch ON	10 to 16 V
SBR (A20-12) - SGR (A20-21)	B - G	Rear height control sensor power supply	Ignition switch OFF	Below 1 V
			Ignition switch ON	4.75 to 5.25 V
SPDR (A20-16) - E1 (A20-9)	Y - W	Vehicle speed signal input	Vehicle is driven at approx. 20 km/h	Pulse generation (See waveform 1)
RHE (A20-17) - E1 (A20-9)	LG - W	Leveling motor RH operation signal input	With low beam headlights ON, vehicle height not changed	Below 1 V
			With low beam headlights ON, change vehicle height and keep for more than 3 seconds.	1.0 to 14.4 V
LHE (A20-18) - E1 (A20-9)	W - W	Leveling motor LH operation signal input	With low beam headlights ON, vehicle height not changed	Below 1 V
			With low beam headlights ON, change vehicle height and keep for more than 3 seconds.	1.0 to 14.4 V
SHRL (A20-19) - SGR (A20-21)	L - G	Rear height control sensor signal input	Ignition switch OFF	Below 1 V
			Ignition switch ON	0.5 to 4.5 V

If the result is not as specified, the ECU may have a malfunction.

Waveform 1
Item
Contents
Tool setting
2 V/DIV., 2 ms./DIV.

Item	Contents
Tool setting	5 V/DIV., 5 ms./DIV.

Item	Contents
Tool setting	2 V/DIV., 2 ms./DIV.