Toyota CH-R Service Manual: High Beam Headlight Circuit

Toyota CH-R Service Manual / Lighting (ext) / Lighting System / High Beam Headlight Circuit

DESCRIPTION

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuse for circuits related to this system before performing the following procedure.
  • Check the operation of the low beam headlights. If the low beam headlights do not operate normally, refer to Problem Symptoms Table.

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

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    • *1: w/ Smart Key System

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM (HEAD LIGHT HI)

(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) Check that the high beam headlights illuminate.

Body Electrical > Main Body > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Head Light Hi

High beam headlights

ON or OFF

-

Body Electrical > Main Body > Active Test

Tester Display

Head Light Hi

OK:

The high beam headlights illuminate.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

INSPECT H-LP SHADE RELAY

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

(b) Inspect the H-LP SHADE relay.

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NG

REPLACE H-LP SHADE RELAY

OK

3.

CHECK HARNESS AND CONNECTOR (H-LP SHADE 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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

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

(a) Disconnect the A11 headlight assembly LH connector.

(b) Disconnect the A29 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 - A11-3 (SOL)

Always

Below 1 Ω

Relay terminal 3 - A29-3 (SOL)

Always

Below 1 Ω

A11-6 (E) - Body ground

Always

Below 1 Ω

A29-6 (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 SHADE RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the F15 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 - F15-1 (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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