DTC    B1206    P/W Master Switch Communication Stop

for Preparation Click here


DESCRIPTION

The main body ECU stores a DTC when communication with the power window regulator master switch assembly is interrupted for 10 seconds or more.

DTC No.
DTC Detection Condition
Trouble Area
B1206
Communication between power window regulator master switch assembly and main body ECU interrupted for 10 seconds or more, or communication wire malfunction.
  1. Harness or connector
  2. Power window regulator master switch assembly
  3. Main body ECU
  4. Instrument panel junction block assembly

WIRING DIAGRAM


E175947E01


INSPECTION PROCEDURE

HINT:
  1. When using the intelligent tester, repeatedly turn either front door courtesy light switch off-and-on at intervals of 1.5 seconds or less, until communication between the intelligent tester and vehicle begins.
  2. When the main body ECU has been replaced with a new part, or when the battery negative terminal is reconnected, the ignition switch condition will be ON. Also, when the battery has been removed and installed, the condition will be the same as it was before the battery was disconnected.

NOTICE:
Inspect the fuses for this circuit before starting this inspection procedure.

1.CLEAR DTC

  1. Clear DTCs (Click here).


NEXT


2.CHECK FOR DTC

  1. Check for DTCs (Click here).
    Result 
    Result
    		Proceed to
    DTC B1206 is output
    		A
    DTC B1206 and B2325 are output
    		B

    HINT:
    When both B1206 and B2325 are output at the same time, troubleshoot B2325 first.



B
GO TO DIAGNOSTIC TROUBLE CODE CHART (Click here)
A


3.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL J/B - MASTER SWITCH)


    E175948E01

  1. Disconnect the 3C instrument panel junction block assembly connector.

  1. Disconnect the E1 or F1 power window regulator master switch assembly connector.

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

    Standard Resistance:
    for RHD 
    Tester Connection
    		Condition
    		Specified Condition
    3C-28 (LIN2) - E1-17 (LIN1)
    		Always
    		Below 1 Ω
    E1-17(LIN1) - Body ground
    		Always
    		10 KΩ or higher
    for LHD 
    Tester Connection
    		Condition
    		Specified Condition
    3C-28 (LIN2) - F1-17 (LIN1)
    		Always
    		Below 1 Ω
    F1-17(LIN1) - Body ground
    		Always
    		10 KΩ or higher

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

    Standard Voltage:
    for RHD 
    Tester Connection
    		Condition
    		Specified Condition
    E1-17 (LIN1) - Body ground
    		Always
    		Below 0.5 V
    for LHD 
    Tester Connection
    		Condition
    		Specified Condition
    F1-17 (LIN1) - Body ground
    		Always
    		Below 0.5 V

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Instrument Panel Junction Block Assembly)
    *2
    		Front view of wire harness connector
    (to Power Window Regulator Master Switch Assembly)
    *3
    		for RHD
    *4
    		for LHD

  1. Reconnect the instrument panel junction block assembly connector.

  1. Reconnect the power window regulator master switch connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (MASTER SWITCH - BATTERY AND BODY GROUND)


    E175949E01

  1. Disconnect the E1 or F1 power window regulator master switch assembly connector.

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

    Standard Voltage:
    for RHD 
    Tester Connection
    		Condition
    		Specified Condition
    E1-11 (B) - Body ground
    		Always
    		11 to 14 V
    for LHD 
    Tester Connection
    		Condition
    		Specified Condition
    F1-11 (B) - Body ground
    		Always
    		11 to 14 V

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

    Standard Resistance:
    for RHD 
    Tester Connection
    		Condition
    		Specified Condition
    E1-12 (GND) - Body ground
    		Always
    		Below 1 Ω
    for LHD 
    Tester Connection
    		Condition
    		Specified Condition
    F1-12 (GND) - Body ground
    		Always
    		Below 1 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Power Window Regulator Master Switch Assembly)
    *2
    		for RHD
    *3
    		for LHD

  1. Reconnect the power window regulator master switch assembly connector.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


5.REPLACE POWER WINDOW REGULATOR MASTER SWITCH NORMAL ONE

  1. Replace the power window regulator master switch assembly with a normally functioning part (Click here).

  1. Clear DTCs (Click here).


NEXT


6.RECONFIRM DTC OUTPUT

  1. Recheck for DTCs (Click here).
    Result 
    Result
    		Proceed to
    DTC B1206 is not output
    		A
    DTC B1206 is output
    		B



B
Go to step 7
A

END (POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY MALFUNCTION) 

7.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

B210280E04


Text in Illustration 
*1
Component without harness connected
(Instrument Panel Junction Block Assembly)

  1. Remove the instrument panel junction block assembly (Click here).

  1. Remove the main body ECU from the instrument panel junction block assembly (Click here).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3C-28 (LIN2) - 3F-16 (LIN2)
    		Always
    		Below 1 Ω
    3C-28 (LIN2) - Body ground
    		Always
    		10 KΩ or higher

  1. Reinstall the main body ECU (Click here).

  1. Reinstall the instrument panel junction block assembly (Click here).



NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (Click here)
OK

REPLACE MAIN BODY ECU (Click here)