Toyota Yaris: Lighting System / Interior Light Circuit

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / 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
  • 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.

    Click here

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 GTS

(a) 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

Illuminated Entry System

Turns on the lights that are controlled by the illuminated entry system*1

OFF or ON

Perform the Active Test with DOOR switch in the map light assembly and room light assembly turned on.

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

    Click here

Body Electrical > Main Body > Data List

Tester Display

Illuminated Entry System

OK:

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

Result

Proceed to

OK

A

NG (Map light does not come on)

B

NG (Room light does not come on)

C

NG (Map light and room light does not come on)

D

A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

C

GO TO STEP 4

D

GO TO STEP 5

B

2.

INSPECT MAP LIGHT ASSEMBLY

Click here

NG

REPLACE MAP LIGHT ASSEMBLY

OK

3.

CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - POWER DISTRIBUTION BOX ASSEMBLY)

(a) Disconnect the 4C power distribution box assembly connector.

(b) Disconnect the H4 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

V7-1(+B1) - 4C-4

Always

Below 1 Ω

OK

USE SIMULATION METHOD TO CHECK

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.

CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - ROOM LIGHT ASSEMBLY)

(a) Disconnect the 4C power distribution box assembly connector.

(b) Disconnect the V3 room light assembly connector.

(c) Disconnect the V7 map light assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

V3-1 (B) - V7-1 (+B1)

Always

Below 1 Ω

V3-3 (CTY) - V7-9 (RLMP)

Always

Below 1 Ω

OK

USE SIMULATION METHOD TO CHECK

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

INSPECT MAP LIGHT ASSEMBLY

Click here

NG

REPLACE MAP LIGHT ASSEMBLY

OK

6.

CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - POWER DISTRIBUTION BOX ASSEMBLY)

(a) Disconnect the 4C power distribution box assembly connector.

(b) Disconnect the H4 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

V7-1(+B1) - 4C-4

Always

Below 1 Ω

V7-2 (DOOR) - H4-5 (ILE)

Always

Below 1 Ω

V7-1(+B1) or 4C-4 - Body ground

Always

10 kΩ or higher

V7-2 (DOOR) or H4-5 (ILE) - 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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