Toyota Avalon Service & Repair Manual: 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

w/o Navigation System w/ Navigation System

PROCEDURE

1.

CHECK MODEL

(a) Choose the model to be inspected.

Result

Proceed to

w/o Navigation System

A

w/ Navigation System

B

B

GO TO STEP 3

A

2.

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

(a) Disconnect the G11 DCM (Telematics Transceiver) connector.

*a

Front view of wire harness connector

(to DCM (Telematics Transceiver))

(b) Disconnect the G1 and G108 radio and display receiver assembly connector.

*a

Front view of wire harness connector

(to Radio and Display Receiver Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G11-1 (USB-) - G108-2 (USB-)

Always

Below 1 Ω

G11-2 (USB+) - G108-1 (USB+)

Always

Below 1 Ω

G11-6 (USBS) - G108-3 (USBS)

Always

Below 1 Ω

G11-3 (USBG) - G1-11 (USBG)

Always

Below 1 Ω

G11-4 (VOT+) - G1-13 (VOR+)

Always

Below 1 Ω

G11-5 (USBV) - G1-10 (USBV)

Always

Below 1 Ω

G11-7 (VOT-) - G1-14 (VOR-)

Always

Below 1 Ω

G11-8 (VOR-) - G1-16 (VOT-)

Always

Below 1 Ω

G11-9 (VOR+) - G1-15 (VOT+)

Always

Below 1 Ω

G11-1 (USB-) or G108-2 (USB-) - Body ground

Always

10 kΩ or higher

G11-2 (USB+) or G108-1 (USB+) - Body ground

Always

10 kΩ or higher

G11-6 (USBS) or G108-3 (USBS) - Body ground

Always

10 kΩ or higher

G11-3 (USBG) or G1-11 (USBG) - Body ground

Always

10 kΩ or higher

G11-4 (VOT+) or G1-13 (VOR+) - Body ground

Always

10 kΩ or higher

G11-5 (USBV) or G1-10 (USBV) - Body ground

Always

10 kΩ or higher

G11-7 (VOT-) or G1-14 (VOR-) - Body ground

Always

10 kΩ or higher

G11-8 (VOR-) or G1-16 (VOT-) - Body ground

Always

10 kΩ or higher

G11-9 (VOR+) or G1-15 (VOT+) - 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

3.

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

(a) Disconnect the G11 DCM (Telematics Transceiver) connector.

(b) Disconnect the G108 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

G11-3 (USBG) - G108-11 (USBG)

Always

Below 1 Ω

G11-4 (VOT+) - G108-13 (VOR+)

Always

Below 1 Ω

G11-5 (USBV) - G108-10 (USBV)

Always

Below 1 Ω

G11-7 (VOT-) - G108-14 (VOR-)

Always

Below 1 Ω

G11-8 (VOR-) - G108-16 (VOT-)

Always

Below 1 Ω

G11-9 (VOR+) - G108-26 (VOT+)

Always

Below 1 Ω

G11-3 (USBG) or G108-11 (USBG) - Body ground

Always

10 kΩ or higher

G11-4 (VOT+) or G108-13 (VOR+) - Body ground

Always

10 kΩ or higher

G11-5 (USBV) or G108-10 (USBV) - Body ground

Always

10 kΩ or higher

G11-7 (VOT-) or G108-14 (VOR-) - Body ground

Always

10 kΩ or higher

G11-8 (VOR-) or G108-16 (VOT-) - Body ground

Always

10 kΩ or higher

G11-9 (VOR+) or G108-26 (VOT+) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

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

(a) Disconnect the G11 DCM (Telematics Transceiver) connector.

*a

Front view of wire harness connector

(to DCM (Telematics Transceiver))

*b

Front view of wire harness connector

(to Navigation ECU)

(b) Disconnect the G113 navigation ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G11-1 (USB-) - G113-2 (USB-)

Always

Below 1 Ω

G11-2 (USB+) - G113-1 (USB+)

Always

Below 1 Ω

G11-6 (USBS) - G113-3 (USBS)

Always

Below 1 Ω

G11-1 (USB-) or G113-2 (USB-) - Body ground

Always

10 kΩ or higher

G11-2 (USB+) or G113-1 (USB+) - Body ground

Always

10 kΩ or higher

G11-6 (USBS) or G113-3 (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

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