Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM10000000257A4
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 - 11/2022]
Title: METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (except 12.3 Inch Display): Power Source Circuit; 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]

Power Source Circuit

WIRING DIAGRAM

for TMC Made
for TMMMS Made

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
  • for TMC Made

    When replacing the combination meter assembly, update the ECU security key.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; SETUP: WHEN REPLACING OR REMOVING/INSTALLING PARTS: UPDATE ECU SECURITY KEY

  • Inspect the fuses of circuits related to this system before performing the following procedure.

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Disconnect the I4 combination meter assembly connector.

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

Standard Voltage (for TMC Made):

Tester Connection

Condition

Specified Condition

I4-5 (B) - Body ground

Ignition switch off

11 to 14 V

I4-6 (IG+) - Body ground

Ignition switch off

Below 1 V

I4-6 (IG+) - Body ground

Ignition switch ON

11 to 14 V

Standard Voltage (for TMMMS Made):

Tester Connection

Condition

Specified Condition

I4-22 (B) - Body ground

Ignition switch off

11 to 14 V

I4-38 (IG+) - Body ground

Ignition switch off

Below 1 V

I4-38 (IG+) - Body ground

Ignition switch ON

11 to 14 V

*a

Front view of wire harness connector

(to Combination Meter Assembly)

*1

for TMC Made

*2

for TMMC Made
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

2.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BODY GROUND)

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

Standard Resistance (for TMC Made):

Tester Connection

Condition

Specified Condition

I4-1 (EP) - Body ground

Always

Below 1 Ω

I4-2 (ES) - Body ground

Always

Below 1 Ω

Standard Resistance (for TMMMS Made):

Tester Connection

Condition

Specified Condition

I4-19 (EP) - Body ground

Always

Below 1 Ω

I4-23 (ES) - Body ground

Always

Below 1 Ω
OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR