Lexus NX manuals

Lexus NX: Telematics Transceiver Disconnected (B15DB)

Lexus NX Service Manual / Audio & Visual & Telematics / Navigation / Multi Info Display / Navigation System / Telematics Transceiver Disconnected (B15DB)

DESCRIPTION

If the radio receiver assembly cannot detect the DCM (telematics transceiver) for a certain period of time (90 seconds) after the power switch is turned on (IG) and the radio receiver assembly confirms that the information is missing by checking past DCM (telematics transceiver) recognition information (registered information), this DTC will be stored.

HINT:

The LEXUS Enform system uses USB communication between devices. If an open, short, short to +B or short to ground occurs in the USB circuit, communication is interrupted and the LEXUS Enform system will not operate normally.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B15DB

Telematics Transceiver Disconnected

DCM (telematics transceiver) disconnected
  • Harness or connector
  • DCM (telematics transceiver)
  • Radio receiver assembly
  • Navigation ECU

HINT:

This DTC may be stored due to environmental reasons such as electrical noise or interference.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • When replacing the DCM (telematics transceiver), make sure to replace it with a new one.
  • When replacing the radio receiver assembly or navigation ECU, always replace it with a new one.

    If a radio receiver assembly or navigation ECU which was installed to another vehicle is used, the following may occur:

    • A communication malfunction DTC may be stored.
    • The radio receiver assembly or navigation ECU may not operate normally.

HINT:

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Navigation System.

Click here

PROCEDURE

1.

CHECK DTC

(a) Clear the DTCs.

Click here

Body Electrical > Navigation System > Clear DTCs

(b) Turn the power switch off.

(c) Turn the power switch on (IG) and wait for 90 seconds.

(d) Recheck for DTCs and check that no DTCs are output.

Click here

Body Electrical > Navigation System > Trouble Codes

OK:

No DTCs are output.

OK

USE SIMULATION METHOD TO CHECK

NG

2.

CHECK HARNESS AND CONNECTOR (DCM [TELEMATICS TRANSCEIVER] - BATTERY AND BODY GROUND)

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

*a

Front view of wire harness connector

(to DCM [Telematics Transceiver])

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I183-20 (E) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

I183-1 (+B) - Body ground

Power switch off

11 to 14 V

I183-19 (IG2) - Body ground

Power switch on (IG)

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

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

(a) Disconnect the I153 radio receiver assembly connector.

(b) Disconnect the I183 DCM (telematics transceiver) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I153-10 (USBV) - I183-15 (USBV)

Always

Below 1 Ω

I153-11 (USBG) - I183-31 (USBG)

Always

Below 1 Ω

I153-10 (USBV) - Body ground

Always

10 kΩ or higher

I153-11 (USBG) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK RADIO RECEIVER ASSEMBLY (USBV, USBG)

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I183-31 (USBG) - Body ground

Always

Below 1 Ω

*a

Front view of wire harness connector

(to DCM [Telematics Transceiver])

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

I183-15 (USBV) - I183-31 (USBG)

Power switch on (IG)

4.75 to 5.25 V
NG

REPLACE RADIO RECEIVER ASSEMBLY

OK

5.

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

(a) Disconnect the I185 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 I176 navigation ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I185-2 (USB+) - I176-1 (USB+)

Always

Below 1 Ω

I185-1 (USB-) - I176-2 (USB-)

Always

Below 1 Ω

I185-3 (USBS) - I176-3 (USBS)

Always

Below 1 Ω

I185-2 (USB+) - Body ground

Always

10 kΩ or higher

I185-1 (USB-) - Body ground

Always

10 kΩ or higher

I185-3 (USBS) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

CHECK DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (telematics transceiver) with a new one.

Click here

(b) Clear the DTCs.

Click here

Body Electrical > Navigation System > Clear DTCs

(c) Turn the power switch off.

(d) Turn the power switch on (IG) and wait for 90 seconds.

(e) Recheck for DTCs and check that no DTCs are output.

Click here

Body Electrical > Navigation System > Trouble Codes

OK:

No DTCs are output.

OK

END (DCM [TELEMATICS TRANSCEIVER] IS DEFECTIVE)
NG

7.

CHECK NAVIGATION ECU

(a) Replace the navigation ECU with a new one.

Click here

(b) Clear the DTCs.

Click here

Body Electrical > Navigation System > Clear DTCs

(c) Turn the power switch off.

(d) Turn the power switch on (IG) and wait for 90 seconds.

(e) Recheck for DTCs and check that no DTCs are output.

Click here

Body Electrical > Navigation System > Trouble Codes

OK:

No DTCs are output.

OK

END (NAVIGATION ECU IS DEFECTIVE)
NG

REPLACE RADIO RECEIVER ASSEMBLY

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