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.
Power Window Master Switch Circuit
1998 Lexus GS 300SECTION Power Window Master Switch Circuit
NOTE:
If LEXUS scan tool is available, start test from step 1). If this scan tool is not available, start test from step 2).
- Check For DTC B1221
Using scan tool, check for DTC B1221. If DTC B1221 is retrieved, go to next step. If DTC B1221 is not retrieved, go to next test listed in appropriate TROUBLE SHOOTING SYMPTOMS table. - Check Power Window Master Switch
Check power window master switch. See POWER WINDOWS article. If switch is okay, go to next step. Replace switch as necessary. Retest system operation. - Check Circuits
Check circuits for faults between power window master switch and driver door ECU. See WIRING DIAGRAMS. Repair or replace as necessary. If circuits are okay, go to next test listed in appropriate TROUBLE SHOOTING SYMPTOMS table.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
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.