Section 421 (Multiplex Communication System - Diagnostics)
WARNING: This page is about a different car, the 2005 Lexus GS 430 and 2005 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
- How To Proceed With Troubleshooting
- Customer Problem Analysis Check
- Pre-Check
- Diagnostic Trouble Code Chart
- Parts Location
- Terminals Of Ecu
- Circuit Inspection
- DTC B1211 / 11: Driver Door ECU Communication Stop
- DTC B1212 / 12: Front passenger Door ECU Communication Stop
- DTC B1213 / 13: Tilt and Telescopic ECU Communication Stop
- DTC B1214 / 14, DTC B1215 / 15: Door System Communication Bus Malfunction (+B short)/(GND short)
- DTC B1216 / 16: Rear Right Door ECU Communication Stop
- DTC B1217 / 17: Rear Left Door ECU Communication Stop
- DTC B1218 / 18: Body ECU No. 2 Communication Stop
- DTC B1221 / 21, B1222 / 22, B1223 / 23, B1224 / 24, B1225 / 25, B1226 / 26, B1241 / 41, B1252 / 52: Power Window/Door Lock Switch Circuit On Driver/Passenger Door, Power Window Switch Circuit On Rear Right/Rear Left Door, Body No. 1/No. 2 Ecu Switch Circuit Diagnosis
- DTC B1231 / 31, B1232 / 32, B1234 / 34, B1236 / 36, B1238 / 38: Jam Protection Limit/Pulse Switch Circuit On Driver Door, Jam Protection Pulse Switch Circuit On Passenger/Rear Right/Rear Left Door
- DTC B1233 / 33, B1235 / 35, B1237 / 37: Jam Protection Limit Switch Circuit On Passenger/Rear Right/Rear Left Door
- DTC B1242 / 42: Wireless Door Lock Tuner Circuit Malfunction
- DTC B1244 / 44: Light Sensor Circuit Malfunction
- DTC B1261 / 61: ECM Communication Stop
- DTC B1262 / 62: A/C Amplifier Communication Stop
- DTC B1266 / 66, B1267 / 67: Instrument Panel System Communication Bus Malfunction (+B short)/(GND short)
- DTC B1271 / 71: Combination Meter ECU Communication Stop
- DTC B1272 / 72: Power Seat ECU Communication Stop (W/ Seat Memory Vehicle Only)
- DTC B1273 / 73: Sliding Roof ECU Communication Stop (W/ Sliding Roof Vehicle Only)
- DTC B1281 / 81: Airbag Sensor Assembly Communication Stop
- DTC B1285 / 85: Steering Pad Switch Communication Stop (GS 430 Only)
- DTC B1293 / 93: Gateway ECU Communication Stop