Toyota Camry (XV70): Daytime Running Light Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the daytime running lights.

WIRING DIAGRAM

for Bulb Type Turn Signal Light

for LED Type Turn Signal Light

CAUTION / NOTICE / HINT

NOTICE:

• Inspect the fuses for circuits related to this system before performing the following procedure.
• Before replacing the main body ECU (multiplex network body ECU), refer to Registration.*

  Click here

  • *: w/ Smart Key System

PROCEDURE

1.	CONFIRM MODEL

(a) Choose the model to be inspected.

Result	Proceed to
for Bulb Type Turn Signal Light	A
for LED Type Turn Signal Light	B

B

GO TO STEP 6

A

2.	CHECK OPERATION (LOW BEAM HEADLIGHTS)

(a) Check the operation of the low beam headlights.

OK:

The low beam headlights operate normally.

NG

GO TO PROBLEM SYMPTOMS TABLE

OK

3.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Main Body > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Daytime Running Light	Daytime running lights	OFF or ON	-

Body Electrical > Main Body > Active Test

Tester Display
Daytime Running Light

OK:

Daytime running lights illuminate.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

4.	CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the A51 headlight assembly LH connector.

(b) Disconnect the A50 headlight assembly RH connector.

(c) Disconnect the 3C instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A51-6 (B) - 3C-28	Always	Below 1 Ω
A50-6 (B) - 3C-28	Always	Below 1 Ω
A51-6 (B) or 3C-28 - Body ground	Always	10 kΩ or higher
A50-6 (B) or 3C-28 - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

*a

Component without harness connected (Instrument Panel Junction Block Assembly)

-

-

(a) Remove the instrument panel junction block assembly.

Click here

(b) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3C-28 - MB-25 (DRL)	Always	Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

6.	CHECK OPERATION (PARKING LIGHTS)

(a) Check the operation of the parking lights.

OK:

The parking lights operate normally.

NG

GO TO PROBLEM SYMPTOMS TABLE

OK

7.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Main Body > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Daytime Running Light	Daytime running lights	OFF or ON	-

Body Electrical > Main Body > Active Test

Tester Display
Daytime Running Light

OK:

Daytime running lights illuminate.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

8.	INSPECT DRL RELAY

(a) Inspect the DRL relay.

Click here

NG

REPLACE DRL RELAY

OK

9.	CHECK HARNESS AND CONNECTOR (POWER SOURCE - DRL RELAY)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
1 (DRL relay) - Body ground	Always	11 to 14 V
3 (DRL relay) - Body ground	Always	11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

10.	CHECK HARNESS AND CONNECTOR (DRL RELAY - HEADLIGHT ASSEMBLY)

(a) Disconnect the A75 headlight assembly LH connector.

(b) Disconnect the A74 headlight assembly RH connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
5 (DRL relay) - A75-1 (B)	Always	Below 1 Ω
5 (DRL relay) - A74-1 (B)	Always	Below 1 Ω
5 (DRL relay) or A75-1 (B) - Body ground	Always	10 kΩ or higher
5 (DRL relay) or A74-1 (B) - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

11.	CHECK HARNESS AND CONNECTOR (DRL RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the 3C instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
2 (DRL relay) - 3C-28	Always	Below 1 Ω
2 (DRL relay) or 3C-28 - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

12.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

*a

Component without harness connected (Instrument Panel Junction Block Assembly)

-

-

(a) Remove the instrument panel junction block assembly.

Click here

(b) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3C-28 - MB-25 (DRL)	Always	Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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