Rear Power Window LH does not Operate with Rear Power Window Switch LH: Procedure

WARNING: This page is about a different car, the 2012 Lexus LS 460. However, it is still accessible from the selected car via links, so may be relevant.

CHECK LIN COMMUNICATION SYSTEM
1. Check for LIN communication system DTCs related to the power window control system.
  OK
  
  LIN communication system DTCs are not output.
NG → See step 11

OK: Go to next step
CHECK FOR DTC (B2312)
1. Check if DTC B2312 is output.
  OK
  
  DTC B2312 is not output.
NG → See step 9

OK: Go to next step

READ VALUE USING TECHSTREAM (REAR POWER WINDOW REGULATOR SWITCH LH)

Use the Data List to check if the power window regulator motor is functioning properly.

RL-DOOR MOTOR:

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
RL Door P/W Up SW	Rear power window LH manual UP switch signal / ON or OFF	ON: Rear power window LH manual UP switch operated OFF: Rear power window switch LH not operated	-
RL Door P/W Down SW	Rear power window LH manual DOWN switch signal / ON or OFF	ON: Rear power window LH manual DOWN switch operated OFF: Rear power window switch LH not operated	-

Techstream display changes normally when rear power window switch LH is operated.

NG → See step 4

OK → See step 8

CHECK HARNESS AND CONNECTOR (REAR MULTIPLEX NETWORK DOOR ECU LH - REAR POWER WINDOW REGULATOR SWITCH LH)

Disconnect the O15 ECU connector.

Fig 1: Identifying O15 ECU Connector & O18 Switch Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the O18 switch connector.

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

Standard resistance

Tester Connection	Condition	Specified Condition
O15-25 (SGND) - O18-5 (GND)	Always	Below 1 Ω
O15-25 (SGND) or O18-5 (GND) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK HARNESS AND CONNECTOR (REAR MULTIPLEX NETWORK DOOR ECU LH - REAR POWER WINDOW REGULATOR MOTOR LH)

Disconnect the O14 ECU connector.

Fig 2: Identifying O14 ECU Connector & O19 Motor Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the O19 motor connector.

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

Standard resistance

Tester Connection	Condition	Specified Condition
O14-5 (BDRJ) - O19-2 (B)	Always	Below 1 Ω
O14-2 (PWE) - O19-1 (E)	Always	Below 1 Ω
O14-5 (BDRJ) or O19-2 (B) - Body ground	Always	10 kΩ or higher
O14-2 (PWE) or O19-1 (E) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK HARNESS AND CONNECTOR (REAR POWER WINDOW REGULATOR SWITCH LH - REAR POWER WINDOW REGULATOR MOTOR LH)

Disconnect the O18 switch connector.

Fig 3: Identifying O18 Switch Connector And O19 Motor Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the O19 motor connector.

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

Standard resistance

Tester Connection	Condition	Specified Condition
O18-2 (UP) - O19-10 (UP1)	Always	Below 1 Ω
O18-10 (DOWN) - O19-7 (DWN1)	Always	Below 1 Ω
O18-2 (UP) or O19-10 (UP1) - Body ground	Always	10 kΩ or higher
O18-10 (DOWN) or O19-7 (DWN1) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

INSPECT REAR POWER WINDOW REGULATOR SWITCH ASSEMBLY LH

Fig 4: Identifying Rear Power Window Regulator Switch Assembly LH Connector Terminal

Remove the switch.

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

Standard resistance

Tester Connection	Switch Condition	Specified Condition
O18-2 (UP) - O18-5 (GND)	Manual UP operation	Below 1 Ω
O18-10 (DOWN) - O18-5 (GND)	Manual DOWN operation	Below 1 Ω

NG → See step 10

OK → See step 8

REPLACE REAR POWER WINDOW REGULATOR MOTOR ASSEMBLY LH. Refer to REMOVAL
GO TO DTC B2312. Refer to DTC B2312: Power Window Switch Malfunction
REPLACE REAR POWER WINDOW REGULATOR SWITCH ASSEMBLY LH. Refer to REMOVAL
GO TO LIN COMMUNICATION SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING