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.
2008 Scion xD AutomaticFACTORY OEM SERVICE PROCEDURE
Terminals Of Ecu
- CHECK POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLYΒ
- Disconnect the J1 power window regulator master switch assembly connector.
- Measure the voltage and resistance of the wire harness side connector.
Standard:Β
VOLTAGE AND RESISTANCE SPECIFICATIONSTerminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition J1-6 (B) - Body ground GR - Body ground Ignition power supply Ignition switch OFF Below 1 V J1-6 (B) - Body ground GR - Body ground Ignition power supply Ignition switch ON 11 to 14 V J1-1 (E) - Body ground W-B - Body ground Ground Always Below 1 Ξ© If the result is not as specified, there may be a malfunction on the wire harness side.
- Reconnect the J1 power window regulator master switch assembly connector.
- Measure the voltage of the connector.
Standard voltage:Β
STANDARD VOLTAGE SPECIFICATIONSTerminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition J1-3 (U) - J1-1 (E) R - W-B Power window motor UP output (driver side) Ignition switch ON, driver side power window switch OFF β UP (manual operation) Below 1 V β 11 to 14 V J1-4 (D) - J1-1 (E) G - W-B Power window motor DOWN output (driver side) Ignition switch ON, driver side power window switch OFF β DOWN (manual operation) Below 1 V β 11 to 14 V J1-4 (D) - J1-1 (E) G - W-B Power window motor DOWN output (driver side) Ignition switch ON, driver side power window fully closed β driver side power window switch DOWN (AUTO operation) β driver side power window fully open Below 1 V β 11 to 14 V β Below 1 V J1-16 (U) - J1-1 (E) W - W-B Power window motor UP output (passenger side) Ignition switch ON, passenger side power window switch OFF β UP Below 1 V β 11 to 14 V J1-15 (D) - J1-1 (E) P - W-B Power window motor DOWN output (passenger side) Ignition switch ON, passenger side power window switch OFF β DOWN Below 1 V β 11 to 14 V J1-12 (U) - J1-1 (E) Y - W-B Power window motor UP output (rear LH) Ignition switch ON, rear LH side power window switch OFF β UP Below 1 V β 11 to 14 V J1-13 (D) - J1-1 (E) B - W-B Power window motor DOWN output (rear LH) Ignition switch ON, rear LH side power window switch OFF β DOWN Below 1 V β 11 to 14 V J1-10 (U) - J1-1 (E) R - W-B Power window motor UP output (rear RH) Ignition switch ON, rear RH side power window switch OFF β UP Below 1 V β 11 to 14 V J1-18 (D) - J1-1 (E) G - W-B Power window motor DOWN output (rear RH) Ignition switch ON, rear RH side power window switch OFF β DOWN Below 1 V β 11 to 14 V If the result is not as specified, the master switch may have a malfunction.
- Check the AUTO light illumination.
- After turning the ignition switch ON, check that the AUTO light illuminates (green).
- CHECK FRONT POWER WINDOW REGULATOR SWITCH ASSEMBLY RHΒ
Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
- Disconnect the I1 front power window regulator switch assembly RH connector.
- Measure the voltage of the wire harness side connector.
Standard voltage:Β
STANDARD VOLTAGE SPECIFICATIONSTerminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition I1-3 (B) - Body ground L - Body ground Ignition power supply Ignition switch OFF Below 1 V I1-3 (B) - Body ground L - Body ground Ignition power supply Ignition switch ON 11 to 14 V I1-1 (D) - Body ground G - Body ground Power window motor DOWN output Ignition switch ON, power window switch OFF β DOWN Below 1 V β 11 to 14 V I1-2 (SD) - Body ground P - Body ground Power window motor DOWN input (Remote) Ignition switch ON, power window master switch OFF β DOWN (Remote) Below 1 V β 11 to 14 V I1-4 (U) - Body ground R - Body ground Power window motor UP output Ignition switch ON, power window switch OFF β UP Below 1 V β 11 to 14 V I1-5 (SU) - Body ground W - Body ground Power window motor UP input (Remote) Ignition switch ON, power window master switch OFF β UP (Remote) Below 1 V β 11 to 14 V If the result is not as specified, there may be a malfunction on the wire harness side.
- Reconnect the I1 front power window regulator switch assembly RH connector.
- CHECK REAR POWER WINDOW REGULATOR SWITCH ASSEMBLY LHΒ
Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
- Disconnect the H1 rear power window regulator switch assembly LH connector.
- Measure the voltage of the wire harness side connector.
Standard voltage:Β
STANDARD VOLTAGE SPECIFICATIONSTerminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition H1-3 (B) - Body ground SB - Body ground Ignition power supply Ignition switch OFF Below 1 V H1-3 (B) - Body ground SB - Body ground Ignition power supply Ignition switch ON 11 to 14 V H1-4 (U) - Body ground Y - Body ground Power window motor UP output Ignition switch ON, power window switch OFF β UP Below 1 V β 11 to 14 V H1-1 (D) - Body ground B - Body ground Power window motor DOWN output Ignition switch ON, power window switch OFF β DOWN Below 1 V β 11 to 14 V H1-5 (SU) - Body ground R - Body ground Power window motor UP input (Remote) Ignition switch ON, power window master switch OFF β UP (Remote) Below 1 V β 11 to 14 V H1-2 (SD) - Body ground G - Body ground Power window motor DOWN input (Remote) Ignition switch ON, power window master switch OFF β DOWN (Remote) Below 1 V β 11 to 14 V If the result is not as specified, there may be a malfunction on the wire harness side.
- Reconnect the H1 rear power window regulator switch assembly LH connector.
- CHECK REAR POWER WINDOW REGULATOR SWITCH ASSEMBLY RHΒ
Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
- Disconnect the K1 rear power window regulator switch assembly RH connector.
- Measure the voltage of the wire harness side connector.
Standard voltage:Β
STANDARD VOLTAGE SPECIFICATIONSTerminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition K1-3 (B) - Body ground SB - Body ground Ignition power supply Ignition switch OFF Below 1 V K1-3 (B) - Body ground SB - Body ground Ignition power supply Ignition switch ON 11 to 14 V K1-4 (U) - Body ground Y - Body ground Power window motor UP output Ignition switch ON, power window switch OFF β UP Below 1 V β 11 to 14 V K1-1 (D) - Body ground B - Body ground Power window motor DOWN output Ignition switch ON, power window switch OFF β DOWN Below 1 V β 11 to 14 V K1-5 (SU) - Body ground R - Body ground Power window motor UP input (Remote) Ignition switch ON, power window master switch OFF β UP (Remote) Below 1 V β 11 to 14 V K1-2 (SD) - Body ground G - Body ground Power window motor DOWN input (Remote) Ignition switch ON, power window master switch OFF β DOWN (Remote) Below 1 V β 11 to 14 V If the result is not as specified, there may be a malfunction on the wire harness side.
- Reconnect the K1 rear power window regulator switch assembly RH connector.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
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