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.
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HOMESERVICE MANUALSLEXUS2004GS 300REPAIR AND DIAGNOSISQUICK LOOKUPSDTC INDEXMULTIPLEX COMMUNICATION SYSTEM DTCS
2004 Lexus GS 300
Multiplex Communication System DTCS
2004 Lexus GS 300SECTION Multiplex Communication System DTCS
MULTIPLEX COMMUNICATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| B1211/11 | Driver door ECU communication stop |
| B1212/12 | Front passenger door ECU communication stop. |
| B1213/13 | Tilt and telescopic ECU communication stop. |
| B1214/14, B1215/15 | Door system communication bus malfunction (+B short)/(GND short) |
| B1216/16 | Rear right door ECU communication stop |
| B1217/17 | Rear left door ECU communication stop |
| B1218/18 | Body ECU No. 2 communication stop |
| B1221/21, B1222/22, B1223/23, B1224/24, B1225/25, B1226/26, B1241/41, B1252/52 | Power window/door lock switch circuit on driver door, Power window/door lock switch circuit on passenger/rear right/rear left/ door, Body No. 1/No. 2 ECU switch circuit diagnosis |
| B1231/31, B1232/32, B1234/34, B1236/36, B1238/38 | Jam protection limit/pulse switch circuit on driver/passenger/rear right/rear left door |
| B1233/33, B1235/35, B1237/37 | Jam protection limit switch circuit on passenger/rear right/rear left door |
| B1242/42 | Wireless door lock tuner circuit malfunction |
| B1244/44 | Light sensor circuit malfunction |
| B1261/61 | ECM communication stop |
| B1262/62 | A/C amplifier communication stop |
| B1266/66, B1267/67 | Instrument panel system communication bus malfunction (+B short)/(GND short) |
| B1271/71 | Combination meter ECU communication stop |
| B1272/72 | Power seat ECU communication stop (w/ Seat memory vehicle only) |
| B1273/73 | Sliding roof ECU communication stop (w/ Sliding roof vehicle only) |
| B1281/81 | Airbag sensor assembly communication stop |
| B1285/85 | Steering pad switch communication stop (GS 430 only) |
| B1293/93 | Gateway ECU communication stop |
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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.