DTC B1206: P/W Master Switch Communication Stop: Procedure

1. Clear DTCs. Refer to DTC CHECK / CLEAR .

NEXT: Go to next step 

1. Check for DTCs. Refer to DTC CHECK / CLEAR .
   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 → See step   8 

A: Go to next step 

1. Disconnect the 3C instrument panel junction block assembly connector.
   Fig 1: Identifying Instrument Panel J/B - Master Switch Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the F1 power window regulator master switch assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   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

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Instrument Panel Junction Block Assembly)
   *b	Front view of wire harness connector (to Power Window Regulator Master Switch Assembly)

4. Reconnect the instrument panel junction block assembly connector.
5. Reconnect the power window regulator master switch connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the F1 power window regulator master switch assembly connector.
   Fig 2: Identifying F1 Power Window Regulator Master Switch Assembly Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   F1-11 (B) - Body ground	Always	11 to 14 V

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F1-12 (GND) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Power Window Regulator Master Switch Assembly)

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the power window regulator master switch assembly with a normally functioning part. Refer to REMOVAL .
2. Clear DTCs. Refer to DTC CHECK / CLEAR .

NEXT: Go to next step 

1. Recheck for DTCs. Refer to DTC CHECK / CLEAR .
   RESULT
   
   

   Result	Proceed to
   DTC B1206 is not output	A
   DTC B1206 is output	B

B → See step   7 

A → END (POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY MALFUNCTION) 

Fig 3: Identifying Instrument Panel Junction Block Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the instrument panel junction block assembly. Refer to REMOVAL .
2. Remove the main body ECU from the instrument panel junction block assembly. Refer to REMOVAL .
3. 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

4. Reinstall the main body ECU. Refer to INSTALLATION .
5. Reinstall the instrument panel junction block assembly. Refer to INSTALLATION .

NG → See step   10 

OK → See step   9