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.

2002 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

Inspection Procedure

INSPECT POWER WINDOW FUNCTION
1. Check that the power window operates via each regulator switch.
  1. If the driver's side does not operate, proceed to "NG-A".
  2. If the passenger's side does not operate, proceed to "NG-B".
1. NG-A: GO TO FLOW CHART (See WINDOW CANNOT BE OPERATED VIA REGULATOR SWITCH IN DRIVER'S SIDE (POWER WINDOW MASTER SWITCH CIRCUIT) )
2. NG-B: GO TO FLOW CHART (See WINDOW CANNOT BE OPERATED VIA REGULATOR SWITCH IN PASSENGERS SIDE (REGULATOR SWITCH CIRCUIT) )
3. OK: Go to next step
INSPECT POWER WINDOW FUNCTION
1. Check that the passenger's power window operates via the remote operation of the master switch.
1. NG: GO TO FLOW CHART (See REMOTE OPERATION VIA MASTER SWITCH IS IMPOSSIBLE IN THE OTHER SEAT(OPERATION VIA EACH DOOR SWITCH IS POSSIBLE) )
2. OK: REPLACE MULTIPLEX NETWORK DOOR ECU FRONT LH

Chapter Navigation

Return to Chapter: Window Cannot Be Operated After Key-Off

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:

• 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.