Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001O4G3
Model Year Start: 2021 Model: GR Corolla Prod Date Range: [04/2020 - 09/2022]
Title: CELLULAR COMMUNICATION: TOYOTA AUDIO MULTIMEDIA SYSTEM (for Gasoline Model): DCM Data Signal Circuit between Navigation ECU and DCM; 2021 - 2022 MY Corolla Corolla Hatchback GR Corolla [04/2020 - 09/2022]

DCM Data Signal Circuit between Navigation ECU and DCM

DESCRIPTION

This circuit is used to send and receive signals between the DCM (telematics transceiver) and radio and display receiver assembly.

WIRING DIAGRAM

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER))

(a) Disconnect the I143 DCM (telematics transceiver) connector.

(b) Disconnect the I57 radio and display receiver assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I143-31 (USBG) - I57-11 (USBG)

Always

Below 1 Ω

I143-17 (VOT+) - I57-13 (VOR+)

Always

Below 1 Ω

I143-15 (USBV) - I57-10 (USBV)

Always

Below 1 Ω

I143-33 (VOT-) - I57-14 (VOR-)

Always

Below 1 Ω

I143-34 (VOR-) - I57-16 (VOT-)

Always

Below 1 Ω

I143-18 (VOR+) - I57-15 (VOT+)

Always

Below 1 Ω

I143-31 (USBG) or I57-11 (USBG) - Body ground

Always

10 kΩ or higher

I143-17 (VOT+) or I57-13 (VOR+) - Body ground

Always

10 kΩ or higher

I143-15 (USBV) or I57-10 (USBV) - Body ground

Always

10 kΩ or higher

I143-33 (VOT-) or I57-14 (VOR-) - Body ground

Always

10 kΩ or higher

I143-34 (VOR-) or I57-16 (VOT-) - Body ground

Always

10 kΩ or higher

I143-18 (VOR+) or I57-15 (VOT+) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

CHECK HARNESS AND CONNECTOR (NAVIGATION ECU - DCM (TELEMATICS TRANSCEIVER))

(a) Disconnect the t6 navigation ECU connector.

*a

Front view of wire harness connector

(to Navigation ECU)

*b

Front view of wire harness connector

(to DCM (Telematics Transceiver))

(b) Disconnect the t7 DCM (telematics transceiver) connector.

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

Tester Connection

Condition

Specified Condition

t6-1 (USB+) - t7-2 (USB+)

Always

Below 1 Ω

t6-2 (USB-) - t7-1 (USB-)

Always

Below 1 Ω

t6-3 (USBS) - t7-3 (USBS)

Always

Below 1 Ω

t6-1 (USB+) or t7-2 (USB+) - Body ground

Always

10 kΩ or higher

t6-2 (USB-) or t7-1 (USB-) - Body ground

Always

10 kΩ or higher

t6-3 (USBS) or t7-3 (USBS) - Body ground

Always

10 kΩ or higher

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR