Lexus IS250 IS220d GSE20 ALE20 - MULTIPLEX COMMUNICATION
MULTIPLEX COMMUNICATION SYSTEM - DIAGNOSTIC TROUBLE CODE CHART
If malfunction code is displayed during DTC check, check the circuit corresponding to the code in the table below. Proceed to the page given for the circuit.
| DTC No. | Detection Item | Trouble Area | See page |
| B1200 | MPX Body ECU Stop | 1. Main Body ECU RH (cowl side J/B RH) 2. Wire harness | |
| B1205 | AFS ECU Communication Stop | 1. AFS ECU 2. Wire harness | |
| B1206 | P/W Master Switch Communication Stop | 1. Multiplex network master switch assembly (power window master switch) 2. Wire harness | |
| B1207 | Smart ECU Stop | 1. Certification ECU 2. Wire harness | |
| B1208 | Passenger Side Outer Mirror ECU | 1. Outer mirror control ECU (Passenger side) 2. Wire harness | |
| B1209 | Driver Side Outer Mirror | 1. Outer mirror control ECU (Driver side) 2. Wire harness | |
| B1210 | Power ECU Stop | 1. Power source control ECU 2. Wire harness | |
| B1213 | Tilt and Telescopic ECU Communication Stop | 1. Tilt and telescopic ECU 2. Wire harness | |
| B1214 | Short to B+ in Door System Communication Bus Malfunction | 1. Main body ECU RH (cowl side J/B RH) 2. Gateway ECU 3. Windshield wiper switch 4. Power window master switch assembly 5. Certification ECU 6. Power source control ECU 7. Main body ECU LH (cowl side J/B LH) 8. Front controller 9. Wire harness | |
| B1215 | Short to GND in Door System Communication Bus Malfunction | 1. Main body ECU RH (cowl side J/B RH) 2. Gateway ECU 3. Windshield wiper switch 4. Power window master switch 5. Certification ECU 6. Power source control ECU 7. Main body ECU LH (cowl side J/B LH) 8. Front controller 9. Wire harness | |
| B1248 | AVC-LAN Communication Impossible | 1. AVC-LAN (radio receiver or multi-display) 2. Wire harness | |
| B1249 | Double Locking ECU Communication Stop | 1. Double door lock ECU 2. Wire harness | |
| B1262 | A/C ECU Communication Stop | 1. Air conditioning amplifier (A/C ECU) 2. Wire harness | |
| B1266 | Short to B+ in Instrument Panel System Communication Bus Malfunction | 1. Gateway ECU 2. Air conditioning amplifier (A/C ECU) 3. AFS ECU 4. Combination meter ECU 5. Wire harness | |
| B1267 | Short to GND in Instrument Panel System Communication Bus Malfunction | 1. Gateway ECU 2. Air conditioning amplifier (A/C ECU) 3. AFS ECU 4. Combination meter ECU 5. Wire harness | |
| B1271 | Combination Meter ECU Communication Stop | 1. Combination meter ECU 2. Wire harness | |
| B1272 | Power Seat ECU Communication Stop | 1. Position control ECU and switch (driver seat ECU) 2. Wire harness | |
| B1273 | Sliding Roof ECU Communication Stop | 1. Sliding roof control ECU 2. Wire harness | |
| B1278 | Combination Switch ECU Communication Stop | 1. Combination switch assembly 2. Wire harness | |
| B1279 | Rain Sensor Communication Stop | 1. Rain sensor 2. Wire harness | |
| B1280 | Left Side Junction Block ECU Communication Stop | 1. Main body ECU LH (cowl side J/B LH) 2. Wire harness | |
| B1289 | Passenger Seat ECU Communication Stop | 1. Position control ECU and switch (passenger seat ECU) 2. Wire harness | |
| B1296 | Front Light ECU Communication Stop | 1. Front controller 2. Wire harness | |
| B1297 | Clearance Sonar ECU Communication Stop | 1. Clearance warning ECU 2. Wire harness |