Lexus NX: P/W Master Switch Communication Stop (B1206)

Lexus NX Service Manual / Power Source & Network / Networking / Lin Communication System / P/W Master Switch Communication Stop (B1206)

DESCRIPTION

This DTC is stored when LIN communication between the multiplex network master switch assembly and main body ECU (multiplex network body ECU) stops for 10 seconds or more.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1206

P/W Master Switch Communication Stop

No communication between multiplex network master switch assembly and main body ECU (multiplex network body ECU) for 10 seconds or more.

  • Multiplex network master switch assembly
  • Main body ECU (multiplex network body ECU)
  • Instrument panel junction block assembly
  • Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When using the Techstream with the power switch off to troubleshoot:

    Connect the Techstream to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Recognition code registration is necessary when replacing the main body ECU (multiplex network body ECU).
  • If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.

    Click here

HINT:

DTC B2325 is output when the communication between all of the following components and main body ECU (multiplex network body ECU) stops.

Click here

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Check for DTCs.

Click here

Body Electrical > Main Body > Trouble Codes
DTC B1206 is not output

USE SIMULATION METHOD TO CHECK

DTC B1206 is output

3.

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY)

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Click here

(b) Disconnect the M10 multiplex network master switch assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A-16 (LIN2) - M10-17 (LIN1)

Always

Below 1 Ω

A-16 (LIN2) - Body ground

Always

10 kΩ or higher

NG

GO TO STEP 7

OK

4.

CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY - BATTERY AND BODY GROUND)

(a) Disconnect the multiplex network master switch assembly connector.

*a

Front view of wire harness connector

(to Multiplex Network Master Switch Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

M10-12 (GND) - 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

M10-11 (B) - Body ground

Power switch off

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

(a) Temporarily replace the multiplex network master switch assembly with a new or normally functioning one.

Click here

(b) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs
NEXT

6.

CHECK FOR DTC

(a) Check for DTCs.

Click here

Body Electrical > Main Body > Trouble Codes
DTC B1206 is not output

END (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY IS DEFECTIVE)

DTC B1206 is output

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

7.

CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY)

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Click here

(b) Disconnect the M10 multiplex network master switch assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4D-41 - M10-17 (LIN1)

Always

Below 1 Ω

4D-41 - Body ground

Always

10 kΩ or higher

OK

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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