LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2003 >> ES 300 >> Repair and Diagnosis >> Body & Frame >> Windows >> Power Window Control System - Diagnosis >> Diagnostic Trouble Code Chart
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Trouble Code Chart

  1. DOOR ECU 

    Standard [Power window regulator master switch (driver's door ECU)]: 

    DIAGNOSTIC TROUBLE CODE CHART

    SAE code Item Diagnosis
    B1231 (POWER WINDOW REGULATOR MOTOR ASSY LH LIMIT SWITCH AND PULSE SENSOR CIRCUIT (DRIVER'S DOOR)  Driver's side jam protection limit switch malfunctions Driver side power window regulator motor assembly open in limit switch system
    B1232 ( POWER WINDOW REGULATOR MOTOR ASSY LH LIMIT SWITCH AND PULSE SENSOR CIRCUIT (DRIVER'S DOOR)  ) Driver's side jam protection sensor malfunctions Driver side power window regulator motor assembly open or short in pulse sensor system

    Standard [Power window regulator switch (passenger's door ECU)]: 

    DIAGNOSTIC TROUBLE CODE CHART

    SAE code Item Diagnosis
    B1233 ( POWER WINDOW REGULATOR MOTOR ASSY RH LIMIT SWITCH AND PULSE SENSOR CIRCUIT (PASSENGER'S DOOR)  ) Passenger's side jam protection limit switch malfunctions Passenger side power window regulator motor assembly RH open in limit switch system
    B1234 ( POWER WINDOW REGULATOR MOTOR ASSY RH LIMIT SWITCH AND PULSE SENSOR CIRCUIT (PASSENGER'S DOOR)  ) Passenger's side jam protection sensor malfunctions Passenger side power window regulator motor assembly RH open or short in pulse sensor system
  2. Driver side J/B (body ECU) (Data list of switch signal by DTC check) 

    Standard [Driver side J/B (body ECU)]: 

    HINT:

    DTC No. B1221 and B1223 are the codes to inform of each switch condition and will be output when the switch is ON. In that these codes are displayed operating the switch or the switch or the codes are not displayed even with operating the switch, there may be trouble in the switch circuit.

    ITEM DIAGNOSIS NOTE

    Item Measurement Item/Range (DTC No.) Normal Condition Diagnosis Note
    (Power window switch circuit on driver door) P/W master SW signal (except window lock SW/B1221 POWER WINDOW ACTIVE TEST (DRIVER'S DOOR)  ) B1221: Operating (ON) either SW of the master SW
    No output of B1221: No operation of any SW (OFF)    		 -
    (Power window switch circuit on passenger door) P/W master SW signal (Except window lock SW / B1223 POWER WINDOW ACTIVE TEST (PASSENGER'S DOOR)  ) B1223: Passenger's door P/W SW or Manual door lock SW is on
    No output of B1223: No operation of any SW (OFF)    		 -
scientia non olet · About LEMON Manuals