Toyota CH-R Service Manual: 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.

Click here

PROCEDURE

1.

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

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.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

INSPECT MAP LAMP ASSEMBLY

(a) Remove the map light assembly.

Click here

(b) Inspect the map light assembly.

Click here

NG

REPLACE MAP LAMP ASSEMBLY

OK

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

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

NG

REPLACE NO. 1 ROOM LIGHT ASSEMBLY

OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

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

*a

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

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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