Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001O4G4
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 Radio Receiver and DCM; 2021 - 2022 MY Corolla Corolla Hatchback GR Corolla [04/2020 - 09/2022]

DCM Data Signal Circuit between Radio Receiver 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 I57 radio and display receiver assembly connector.

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

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

Always

Below 1 Ω

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

Always

Below 1 Ω

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

Always

Below 1 Ω

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

Always

Below 1 Ω

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

Always

Below 1 Ω

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

Always

Below 1 Ω

I57-10 (USBV) - Body ground

Always

10 kΩ or higher

I57-11 (USBG) - Body ground

Always

10 kΩ or higher

I57-15 (VOT+) - Body ground

Always

10 kΩ or higher

I57-16 (VOT-) - Body ground

Always

10 kΩ or higher

I57-13 (VOR+) - Body ground

Always

10 kΩ or higher

I57-14 (VOR-) - Body ground

Always

10 kΩ or higher

I57-12 (SGND) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

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

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

*a

Front view of wire harness connector

(to DCM (Telematics Transceiver))

*b

Front view of wire harness connector

(to Radio and Display Receiver Assembly)

(b) Disconnect the t2 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

t7-1 (USB-) - t2-2 (USB-)

Always

Below 1 Ω

t7-2 (USB+) - t2-1 (USB+)

Always

Below 1 Ω

t7-3 (USBS) - t2-3 (USBS)

Always

Below 1 Ω

t7-1 (USB-) - Body ground

Always

10 kΩ or higher

t7-2 (USB+) - Body ground

Always

10 kΩ or higher

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