Toyota Camry owners & service manuals

Toyota Camry: 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 or navigation ECU.

WIRING DIAGRAM

PROCEDURE

1.

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

(a) Disconnect the K140 DCM (Telematics Transceiver) connector.

(b) Disconnect the K1 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

K140-31 (USBG) - K1-11 (USBG)

Always

Below 1 Ω

K140-17 (VOT+) - K1-13 (VOR+)

Always

Below 1 Ω

K140-15 (USBV) - K1-10 (USBV)

Always

Below 1 Ω

K140-33 (VOT-) - K1-14 (VOR-)

Always

Below 1 Ω

K140-34 (VOR-) - K1-16 (VOT-)

Always

Below 1 Ω

K140-18 (VOR+) - K1-15 (VOT+)

Always

Below 1 Ω

K140-31 (USBG) or K1-11 (USBG) - Body ground

Always

10 kΩ or higher

K140-17 (VOT+) or K1-13 (VOR+) - Body ground

Always

10 kΩ or higher

K140-15 (USBV) or K1-10 (USBV) - Body ground

Always

10 kΩ or higher

K140-33 (VOT-) or K1-14 (VOR-) - Body ground

Always

10 kΩ or higher

K140-34 (VOR-) or K1-16 (VOT-) - Body ground

Always

10 kΩ or higher

K140-18 (VOR+) or K1-15 (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 K141 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 K137 navigation ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K141-1 (USB-) - K137-2 (USB4-)

Always

Below 1 Ω

K141-2 (USB+) - K137-1 (USB4+)

Always

Below 1 Ω

K141-3 (USBS) - K137-3(UGD4)

Always

Below 1 Ω

K141-1 (USB-) or K137-2 (USB4-) - Body ground

Always

10 kΩ or higher

K141-2 (USB+) or K137-1 (USB4+) - Body ground

Always

10 kΩ or higher

K141-3 (USBS) or K137-3 (UGD4) - 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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