Toyota CH-R Service Manual: Low Beam Headlight Circuit

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

DESCRIPTION

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses and bulbs for circuits related to this system before performing the following procedure.
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.*1
Click here
- *1: w/ Smart Key System

PROCEDURE

1.	PERFORM ACTIVE TEST USING TECHSTREAM (HEADLIGHT RELAY)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

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

(e) Check that the relay operates.

Body Electrical > Main Body > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Headlight Relay	Low beam headlights	ON or OFF	-

Body Electrical > Main Body > Active Test

Tester Display
Headlight Relay

OK:

Headlight relay operates. (Low beam headlights illuminate.)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	INSPECT NO. 1 INTEGRATION RELAY (H-LP LH RELAY, H-LP RH RELAY)

(a) Remove the No. 1 integration relay from the No. 1 engine room relay block.

Click here

(b) Inspect the No. 1 integration relay.

Click here

OK:

No. 1 integration relay is normal.

REPLACE NO. 1 INTEGRATION RELAY

3.	CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BATTERY)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
1A-5 - Body ground	Always	11 to 14 V
1B-8 - Body ground	Always	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT ASSEMBLY LH AND HEADLIGHT ASSEMBLY RH AND BODY GROUND)

(a) Disconnect the A9 headlight assembly LH connector.

(b) Disconnect the A28 headlight assembly RH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
1B-1 - A9-2 (LO)	Always	Below 1 Ω
1A-12 - A28-2 (LO)	Always	Below 1 Ω
A9-1 (E) - Body ground	Always	Below 1 Ω
A28-1 (E) - Body ground	Always	Below 1 Ω
1B-1 - Body ground	Always	10 kΩ or higher
1A-12 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - INSTRUMENT PANEL JUNCTION BLOCK)

(a) Disconnect the 3F 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
1A-11 - 3F-31	Always	Below 1 Ω
1B-2 - 3F-31	Always	Below 1 Ω
1A-11 or 3F-31 - Body ground	Always	10 kΩ or higher
1B-2 or 3F-31 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	INSPECT 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.

Component without harness connected

(Instrument Panel Junction Block Assembly)

Standard Resistance:

Tester Connection	Condition	Specified Condition
3F-31 - MB-15 (HRLY)	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Power Source Circuit

DESCRIPTION When the ignition switch is ON or the operation conditions of the headlights are met, the main body ECU (multiplex network body ECU) supplies power to the headlight ECU sub-assemblies ...

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