Connect LEXUS or OBDII scan tool to Data Link Connector 3 (DLC3) located under left side of instrument panel. Turn ignition switch to ON position. Using scan tool, check DTCs and freeze frame data. If DTC 99 is retrieved, see appropriates SYMPTOM DIAGNOSIS table under TROUBLE SHOOTING. If Diagnostic Trouble Code (DTC) is retrieved, see POWER WINDOWS DTC DEFINITIONS table. Erase DTCs using scan tool.

POWER WINDOWS DTC DEFINITIONS

DTC

Definition

B1221

⁽¹⁾ Driver's Power Window Switch Circuit

B1222

⁽²⁾ Driver's Door Lock Switch Circuit

B1223

⁽³⁾ Passenger Power Window Switch Circuit

B1224

⁽²⁾ Passenger Door Lock Switch Circuit

B1225

⁽⁴⁾ Right Rear Power Window Switch Circuit

B1226

⁽⁴⁾ Left Rear Power Window Switch Circuit

B1231

⁽⁵⁾ Driver's Power Window Jam Protection Limit Switch

B1232

⁽⁶⁾ Driver's Power Window Door Jam Protection Pulse Switch

B1233

⁽⁵⁾ Passenger Power Window Jam Protection Limit Switch

B1234

⁽⁶⁾ Passenger Power Window Door Jam Protection Pulse Switch

B1235

⁽⁵⁾ Right Rear Power Window Jam Protection Limit Switch

B1236

⁽⁶⁾ Right Rear Power Window Jam Protection Pulse Switch

B1237

⁽⁵⁾ Left Rear Power Window Jam Protection Limit Switch

B1238

⁽⁶⁾ Left Rear Power Window Jam Protection Pulse Switch

⁽¹⁾	Check power window master switch. See MASTER SWITCH under COMPONENT TESTS.

⁽²⁾	Check door lock control switch and door key lock and unlock switch. See POWER DOOR LOCKS, TRUNK LID & FUEL DOOR - LS430 article.

⁽³⁾	Check passenger power window switch circuit. See PASSENGER SWITCH under COMPONENT TESTS.

⁽⁴⁾	Check appropriate switch and circuit. See MASTER SWITCH or PASSENGER SWITCH under COMPONENT TESTS. Also see WIRING DIAGRAMS .

⁽⁵⁾	Check jam protection limit switch. See JAM PROTECTION LIMIT SWITCH under COMPONENT TESTS.

⁽⁶⁾	Check jam protection pulse switch. See JAM PROTECTION PULSE SWITCH under COMPONENT TESTS.

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.

Safety Warning

Self-Diagnostic System

Use the Manual With the Right Hardware

When to See a Mechanic

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