Lighting. Lighting System Taillight Relay Circuit

When the light control switch, located on the headlight dimmer switch, is turned to the TAIL position, the taillight relay turns on to illuminate the front clearance lights, rear taillights and license plate light.

WIRING DIAGRAM

Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Lighting.Lighting System.Lighting System Taillight Relay Circuit

INSPECTION PROCEDURE

1.CHECK WHETHER LIGHTS ILLUMINATE

Check whether the following lights illuminate: front clearance lights, rear taillights, license plate light.

Result:

Result
Proceed to
All lights do not illuminate
A
Front clearance lights do not illuminate
B
Rear taillights do not illuminate
C
License plate light does not illuminate
D
All lights illuminate
E

Go to step 9

Go to step 11

Go to step 12

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

A

2.INSPECT FUSE (TAIL)

Remove the TAIL fuse from the instrument panel junction block.

Measure the resistance of the fuse.
Standard resistance:
Below 1 Ω

REPLACE FUSE

OK

3.CHECK WIRE HARNESS (INSTRUMENT PANEL JUNCTION BLOCK - BATTERY)

Disconnect the IG instrument panel junction block connector.

Measure the voltage of the wire harness side connector.
Standard voltage:
Tester Connection
Specified Condition
IG-1 - Body ground
11 to 14 V

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

4.CHECK INSTRUMENT PANEL JUNCTION BLOCK (T-LP RELAY)

Disconnect the IG, IE and IS instrument panel connectors.

Measure the resistance of the junction block.
Standard resistance:
Tester Connection
Specified Condition
IG-1 - IE-10
10 kΩ or higher
IG-1 - IE-10
Below 1 Ω
(Battery voltage applied to terminals IG-1 and IS-9)

REPLACE INSTRUMENT PANEL JUNCTION BLOCK (MAIN BODY ECU)

OK

5.CHECK WIRE HARNESS (MAIN BODY ECU - HEADLIGHT DIMMER SWITCH)

Disconnect the E18 main body ECU connector.

Disconnect the E15 headlight dimmer switch connector.

Measure the resistance of the wire harness side connectors.

Standard resistance:
for LH side
Tester Connection
Specified Condition
E18-21 (TAIL) - E15-18 (T)
Below 1 Ω
for RH side
Tester Connection
Specified Condition
E18-21 (TAIL) - E15-13 (T)
Below 1 Ω

for LH side
Tester Connection	Specified Condition
E18-21 (TAIL) - E15-18 (T)	Below 1 Ω

for RH side
Tester Connection	Specified Condition
E18-21 (TAIL) - E15-13 (T)	Below 1 Ω

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

6.CHECK WIRE HARNESS (HEADLIGHT DIMMER SWITCH - BATTERY)

Connect the E18 main body ECU connector.

Disconnect the E15 headlight dimmer switch connector.

Measure the voltage of the wire harness side connector.

Standard voltage:
for LH side
Tester Connection
Specified Condition
E15-18 (T) - Body ground
11 to 14 V
for RH side
Tester Connection
Specified Condition
E15-13 (T) - Body ground
11 to 14 V

for LH side
Tester Connection	Specified Condition
E15-18 (T) - Body ground	11 to 14 V

for RH side
Tester Connection	Specified Condition
E15-13 (T) - Body ground	11 to 14 V

REPLACE INSTRUMENT PANEL JUNCTION BLOCK (MAIN BODY ECU)

OK

7.CHECK WIRE HARNESS (HEADLIGHT DIMMER SWITCH - BODY GROUND)

Disconnect the E15 headlight dimmer switch connector.

Measure the resistance of the wire harness side connector.

Standard resistance:
for LH side
Tester Connection
Specified Condition
E15-12 (EL) - Body ground
Below 1 Ω
for RH side
Tester Connection
Specified Condition
E15-19 (EL) - Body ground
Below 1 Ω

for LH side
Tester Connection	Specified Condition
E15-12 (EL) - Body ground	Below 1 Ω

for RH side
Tester Connection	Specified Condition
E15-19 (EL) - Body ground	Below 1 Ω

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

8.INSPECT HEADLIGHT DIMMER SWITCH

Remove the headlight dimmer switch.

Measure the resistance of the switch.

Standard resistance:
for LH side
Tester Connection
Switch Condition
Specified Condition
18 (T) - 12 (EL)
Light control switch OFF
10 kΩ or higher
18 (T) - 12 (EL)
Light control switch TAIL
Below 1 Ω
for RH side
Tester Connection
Switch Condition
Specified Condition
13 (T) - 19 (EL)
Light control switch OFF
10 kΩ or higher
13 (T) - 19 (EL)
Light control switch TAIL
Below 1 Ω

REPLACE HEADLIGHT DIMMER SWITCH

REPLACE INSTRUMENT PANEL JUNCTION BLOCK (MAIN BODY ECU)

9.CHECK INSTRUMENT PANEL JUNCTION BLOCK (TAILLIGHT RELAY)

Disconnect the IB instrument panel junction block connectors.

Measure the voltage of the junction block.
Standard voltage:
Tester Connection
Condition
Specified Condition
Junction block IB terminal 15 - Body ground
Light control switch TAIL
11 to 14 V
Junction block IB terminal 33 - Body ground

REPLACE INSTRUMENT PANEL JUNCTION BLOCK (MAIN BODY ECU)

OK

10.CHECK WIRE HARNESS (INSTRUMENT PANEL JUNCTION BLOCK - FRONT CLEARANCE LIGHT AND BODY GROUND)

w/ Hood Moulding:
1. Disconnect the A75 and A76 front clearance light connectors.
2. Measure the voltage and resistance of the wire harness side connectors.
  Standard voltage:
  Tester Connection
  Condition
  Specified Condition
  A75-2 - Body ground
  Light control switch TAIL
  11 to 14 V
  A76-2 - Body ground
  Light control switch TAIL
  11 to 14 V
  Standard resistance:
  Tester Connection
  Specified Condition
  A75-1 - Body ground
  Below 1 Ω
  A76-1 - Body ground
  Below 1 Ω

w/o Hood Moulding:
1. Disconnect the A20 and A33 front clearance light connectors.
2. Measure the voltage and resistance of the wire harness side connectors.
  Standard voltage:
  Tester Connection
  Condition
  Specified Condition
  A20-2 - Body ground
  Light control switch TAIL
  11 to 14 V
  A33-2 - Body ground
  Light control switch TAIL
  11 to 14 V
  Standard resistance:
  Tester Connection
  Specified Condition
  A20-1 - Body ground
  Below 1 Ω
  A33-1 - Body ground
  Below 1 Ω

REPAIR OR REPLACE HARNESS AND CONNECTOR

REPLACE FRONT CLEARANCE LIGHT BULB

11.CHECK WIRE HARNESS (INSTRUMENT PANEL JUNCTION BLOCK - REAR COMBINATION LIGHT)

Disconnect the K13 and K15 rear combination light connectors.

Measure the voltage and resistance of the wire harness side connectors.
Standard voltage:
Tester Connection
Condition
Specified Condition
K15-2 - Body ground
Light control switch TAIL
11 to 14 V
K13-2 - Body ground
Light control switch TAIL
11 to 14 V
Standard resistance:
Tester Connection
Specified Condition
K15-1 - Body ground
Below 1 Ω
K13-1 - Body ground
Below 1 Ω

REPAIR OR REPLACE HARNESS AND CONNECTOR

REPLACE REAR COMBINATION LIGHT

12.CHECK WIRE HARNESS (INSTRUMENT PANEL JUNCTION BLOCK - LICENSE PLATE LIGHT AND BODY GROUND)

w/o Tire Carrier:
1. Disconnect the S6 license plate light connector.
2. Measure the voltage and resistance of the wire harness side connector.
  Standard voltage:
  Tester Connection
  Condition
  Specified Condition
  S6-1 - Body ground
  Light control switch TAIL
  11 to 14 V
  Standard resistance:
  Tester Connection
  Specified Condition
  S6-2 - Body ground
  Below 1 Ω

w/o Rear Fog Light (One Piece Type):
1. Disconnect the S6 license plate light connector.
2. Measure the voltage and resistance of the wire harness side connector.
  Standard voltage:
  Tester Connection
  Condition
  Specified Condition
  S6-2 - Body ground
  Light control switch TAIL
  11 to 14 V
  Standard resistance:
  Tester Connection
  Specified Condition
  S6-1 - Body ground
  Below 1 Ω

w/o Rear Fog Light (Two Piece Type):
1. Disconnect the N3 license plate light connector.
2. Measure the voltage and resistance of the wire harness side connector.
  Standard voltage:
  Tester Connection
  Condition
  Specified Condition
  N3-2 - Body ground
  Light control switch TAIL
  11 to 14 V
  Standard resistance:
  Tester Connection
  Specified Condition
  N3-1 - Body ground
  Below 1 Ω

w/ Tire Carrier (w/ Rear Fog Light):
1. Disconnect the N2 license plate light connector.
2. Measure the voltage and resistance of the wire harness side connector.
  Standard voltage:
  Tester Connection
  Condition
  Specified Condition
  N2-2 - Body ground
  Light control switch TAIL
  11 to 14 V
  Standard resistance:
  Tester Connection
  Specified Condition
  N2-1 - Body ground
  Below 1 Ω

REPAIR OR REPLACE HARNESS AND CONNECTOR

REPLACE LICENSE PLATE LIGHT BULB

Result	Proceed to
All lights do not illuminate	A
Front clearance lights do not illuminate	B
Rear taillights do not illuminate	C
License plate light does not illuminate	D
All lights illuminate	E

Tester Connection	Specified Condition
IG-1 - Body ground	11 to 14 V

Tester Connection	Specified Condition
IG-1 - IE-10	10 kΩ or higher
IG-1 - IE-10	Below 1 Ω (Battery voltage applied to terminals IG-1 and IS-9)

Tester Connection	Switch Condition	Specified Condition
18 (T) - 12 (EL)	Light control switch OFF	10 kΩ or higher
18 (T) - 12 (EL)	Light control switch TAIL	Below 1 Ω

Tester Connection	Condition	Specified Condition
Junction block IB terminal 15 - Body ground	Light control switch TAIL	11 to 14 V
Junction block IB terminal 33 - Body ground	Light control switch TAIL	11 to 14 V

Tester Connection	Specified Condition
A75-1 - Body ground	Below 1 Ω
A76-1 - Body ground	Below 1 Ω

Tester Connection	Specified Condition
A20-1 - Body ground	Below 1 Ω
A33-1 - Body ground	Below 1 Ω

Tester Connection	Specified Condition
K15-1 - Body ground	Below 1 Ω
K13-1 - Body ground	Below 1 Ω

Tester Connection	Specified Condition
S6-2 - Body ground	Below 1 Ω

Tester Connection	Specified Condition
S6-1 - Body ground	Below 1 Ω

Tester Connection	Specified Condition
N3-1 - Body ground	Below 1 Ω

Tester Connection	Specified Condition
N2-1 - Body ground	Below 1 Ω