Toyota CH-R Service Manual: Interior Light Circuit

Toyota CH-R Service Manual / Lighting (int) / Lighting System / Interior Light Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the operation of the following lights:

Map Light Assembly
No. 1 Room Light Assembly

WIRING DIAGRAM

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*1.
Click here
- *1: w/ Smart Key System

HINT:

The DOME CUT relay supplies power to the interior lights. If all the lights that use power from the DOME CUT relay do not turn on, check the interior light auto cut circuit first.

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PROCEDURE

1.	PERFORM ACTIVE TEST USING TECHSTREAM

(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) 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
Illuminated Entry System	Turns on the lights that are controlled by the illuminated entry system.*	ON or OFF	-

*: Refer to System Description for the lights that are controlled by the illuminated entry system.
Click here

Body Electrical > Main Body > Active Test

Tester Display
Illuminated Entry System

OK:

All lights that are controlled by the illuminated entry system come on.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	INSPECT MAP LAMP ASSEMBLY

(a) Remove the map light assembly.

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(b) Inspect the map light assembly.

Click here

REPLACE MAP LAMP ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - NO. 1 ROOM LIGHT ASSEMBLY)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R2-12(+B1) - R2-4 (RLMP)	No. 1 room light switch in DOOR position	Below 1 Ω
R2-12(+B1) - R2-4 (RLMP)	No. 1 room light switch in ON position	10 kΩ or higher
R2-12 (+B1) or R2-4 (RLMP) - Body ground	No. 1 room light switch in DOOR position	10 kΩ or higher

REPLACE NO. 1 ROOM LIGHT ASSEMBLY

4.	CHECK HARNESS AND CONNECTOR (DOME CUT RELAY - MAP LIGHT ASSEMBLY)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
R2-12 (+B1) - Body ground	Battery saving function not operating	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the 3D 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
R2-10 (DOOR) - 3D-29	Always	Below 1 Ω
R2-10 (DOOR) or 3D-29 - 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.

Click here

Component without harness connected

(Instrument Panel Junction Block Assembly)

Standard Resistance:

Tester Connection	Condition	Specified Condition
3D-29 - MB-1 (ILE)	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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DESCRIPTION The main body ECU (multiplex network body ECU) detects the condition of the door courtesy light switch assembly. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Before replacing th ...

Interior Light Auto Cut Circuit

DESCRIPTION The main body ECU (multiplex network body ECU) controls operation of the DOME CUT relay in order to supply power to the interior lights. When the battery saving function operates whil ...

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