Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Driver Side Power Window does not Operate with Power Window Master Switch: Procedure
- CHECK DTC OUTPUT (MULTIPLEX COMMUNICATION SYSTEM)
- Use the Techstream to check if the multiplex communication system (BEAN) is functioning normally. Refer to DTC CHECK / CLEAR
.
OK
DTC(s) is not output.
NG → See step 7
OK: Go to next step
- Use the Techstream to check if the multiplex communication system (BEAN) is functioning normally. Refer to DTC CHECK / CLEAR
.
- CHECK HARNESS AND CONNECTOR (MASTER SWITCH - DRIVER SIDE MOTOR)
- Disconnect the multiplex network master switch assembly connector.
- Disconnect the power window regulator motor assembly (for driver side) connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition M18-20 (U) - M16-10 (UP1) Always Below 1 Ω M18-16 (D) - M16-7 (DWN1) Always Below 1 Ω M18-9 (LIN2) - M16-9 (LIN) Always Below 1 Ω M18-20 (U) - Body ground Always 10 kΩ or higher M18-16 (D) - Body ground Always 10 kΩ or higher M18-9 (LIN2) - Body ground Always 10 kΩ or higher M16-10 (UP1) - Body ground Always 10 kΩ or higher M16-7 (DWN1) - Body ground Always 10 kΩ or higher M16-9 (LIN) - Body ground Always 10 kΩ or higher
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step
- CHECK HARNESS AND CONNECTOR (REGULATOR MOTOR - BATTERY AND BODY GROUND)
- Measure the voltage according to the value(s) in the table below.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Standard Voltage
Tester Connection Condition Specified Condition M16-2 (B) - Body ground Always 11 to 14 V - Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition M16-1 (E) - Body ground Always Below 1 Ω
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step
- Measure the voltage according to the value(s) in the table below.
- REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY
- Replace the multiplex network master switch assembly. Refer to REMOVAL .
NEXT: Go to next step
- CHECK MANUAL UP / DOWN FUNCTION (for Driver Side)
- Check that the driver side door power window moves when the manual up/down function of the multiplex network master switch assembly is operated. Refer to OPERATION CHECK .
OK
Driver side manual up/down function is normal.
NG → See step 6
OK → END (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY IS DEFECTIVE)
- Check that the driver side door power window moves when the manual up/down function of the multiplex network master switch assembly is operated. Refer to OPERATION CHECK .
- REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Side). Refer to REMOVAL
- GO TO MULTIPLEX COMMUNICATION SYSTEM (Proceed to Diagnostic Trouble Code Chart). Refer to DIAGNOSTIC TROUBLE CODE CHART
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.