Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: High Beam Headlight Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the high beam headlights.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Before replacing the main body ECU (multiplex network body ECU), refer to refer to Registration.*1

    Click here

  • Check the operation of the low beam headlights. If the low beam headlights do not operate normally, refer to Problem Symptoms Table.

    Click here

  • First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this symptom.

    for HEV Model: Click here

    for Gasoline Model: Click here

    • *1: w/ Smart Key System

PROCEDURE

1.

PERFORM ACTIVE TEST USING GTS

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

(b) Perform the Active Test according to the display on the GTS.

Body Electrical > Main Body > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

High Beam Headlight

High beam headlights

OFF or ON

-

Body Electrical > Main Body > Active Test

Tester Display

High Beam Headlight

OK:

High beam headlights illuminate.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

INSPECT H-LP HI RELAY

(a) Remove the H-LP HI relay from the No. 1 engine room relay block.

(b) Inspect the H-LP HI relay.

Click here

NG

REPLACE H-LP HI RELAY

OK

3.

CHECK HARNESS AND CONNECTOR (H-LP HI RELAY - BATTERY)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

Relay terminal 2- Body ground

Always

11 to 14 V

Relay terminal 5- Body ground

Always

11 to 14 V

*1

No. 1 Engine Room Relay Block

*2

H-LP HI Relay Holder

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HARNESS AND CONNECTOR (H-LP HI RELAY - HEADLIGHT ASSEMBLY LH AND HEADLIGHT ASSEMBLY RH AND BODY GROUND)

(a) Disconnect the A131 headlight assembly LH connector.

(b) Disconnect the A134 headlight assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Relay terminal 3 - A131-1 (SOL)

Always

Below 1 Ω

Relay terminal 3 - A134-1 (SOL)

Always

Below 1 Ω

A131-5 (E) - Body ground

Always

Below 1 Ω

A134-5 (E) - Body ground

Always

Below 1 Ω

Relay terminal 3 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK HARNESS AND CONNECTOR (H-LP HI RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the I85 main body ECU (Multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Relay terminal 1 - I85-22 (DIM)

Always

Below 1 Ω

Relay terminal 1- Body ground

Always

10 kΩ or higher

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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