Lexus NX: Extension Module Disconnected 2 (B1543)

DESCRIPTION

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

HINT:

The Navigation 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 Navigation system will not operate normally.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1543

Extension Module Disconnected 2

Navigation ECU disconnected

  • Navigation ECU
  • Radio receiver assembly
  • Harness or connector

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 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 MAP SCREEN

(a) Turn the power switch on (ACC) and wait for 90 seconds.

(b) Press the "MAP" switch and check that the map screen is displayed normally.

Result

Proceed to

Map screen is displayed normally

A

Map screen is not displayed normally

B

HINT:

  • This DTC may be stored due to environmental reasons such as electrical noise or interference.
  • Clear past DTCs when the map screen is displayed normally. (Codes stored due to past environmental factors)
A

USE SIMULATION METHOD TO CHECK

B

2.

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

3.

CHECK HARNESS AND CONNECTOR (NAVIGATION ECU - BATTERY AND BODY GROUND)

(a) Disconnect the navigation ECU connector.

*a

Front view of wire harness connector

(to Navigation ECU)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I173-23 (GND) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

I173-10 (+B) - Body ground

Power switch off

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - NAVIGATION ECU)

(a) Disconnect the z15 navigation ECU connector.

*a

Front view of wire harness connector

(to Navigation ECU)

*b

Front view of wire harness connector

(to Radio Receiver Assembly)

(b) Disconnect the z14 radio receiver assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

z15-4 (US4+) - z14-4 (US4+)

Always

Below 1 Ω

z15-5 (US4-) - z14-5 (US4-)

Always

Below 1 Ω

z15-6 (UGD4) - z14-6 (UGD4)

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

5.

REPLACE NAVIGATION ECU

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

Click here

NEXT

6.

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

END (NAVIGATION ECU IS DEFECTIVE)

NG

REPLACE RADIO RECEIVER ASSEMBLY

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