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.
Inspection Procedure
- PERFORM ACTIVE TEST BY HAND-HELD TESTER
- Data list (for MANUAL UP/DOWN switch)
- Using the hand-held tester, check that DTC B1223 is output when the switch is operated.
HINT: Using DTC "B1223" which is a code when any of the switch is constantly turned on, the MANUAL UP/DOWN switch operation can be monitored. If there is an output of DTC "B1223" when the switch is operated, the switch circuit can be considered normal.
Standard [Driver side J/B (body ECU) (Switch condition)]:
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: Go to step 3
OK: Go to next step.
- Data list (for MANUAL UP/DOWN switch)
- PERFORM ACTIVE TEST BY HAND-HELD TESTER
- Active test
- Select the active test, and then check that the power window operates.
HINT: During the active test, the hand-held tester sends signal to the power window regulator switch (passenger's door ECU) to drive the power window motor. If the power window operates, the power window motor itself and the wire harness between the power window motor and power window regulator switch (passenger's door ECU) is considered normal.
Standard [Power window regulator switch (passenger's door ECU)]:
- Data list (for AUTO UP/DOWN switch)
- Perform a data list of the power window regulator switch (passenger's door ECU).
HINT: Data list displays on the hand-held tester the switch condition judged by the power window regulator switch (passenger's door ECU). If the display changes according to the actual switch operation, the switch itself and the wire harness between the switch and power window regulator switch (passenger's door ECU) is considered normal.
Standard [Power window regulator switch (passenger's door ECU)]:
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Judgement:
A: REPLACE POWER WINDOW REGULATOR SWITCH ASSY
B: REPLACE POWER WINDOW REGULATOR SWITCH ASSY
C: GO TO FLOWCHART (POWER WINDOW REGULATOR MOTOR CIRCUIT) (See POWER WINDOW REGULATOR MOTOR ASSY RH CIRCUIT PASSENGER'S DOOR) )
D: Go to next step.
- Active test
- REPLACE POWER WINDOW REGULATOR SWITCH ASSY
- Replace the power window regulator switch assy.
- Check the power window operation.
OK: END
NG: GO TO FLOWCHART (POWER WINDOW REGULATOR MOTOR CIRCUIT) (See POWER WINDOW REGULATOR MOTOR ASSY RH CIRCUIT PASSENGER'S DOOR) )
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra 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.