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.
1998 Lexus LS 400FACTORY OEM SERVICE PROCEDURE
Multiplex Control DTCS
MULTIPLEX DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description | ||
|---|---|---|---|
| B1211/11 | Communication From Driver's Door ECU To Body ECU Is Cut Off | ||
| B1212/12 | Communication From Passenger Front Door ECU To Body ECU Is Cut Off | ||
| B1213/13 | Communication From Tilt/Telescopic ECU To Body ECU Is Cut Off | ||
| B1214/14 | Door System Bus Communication Circuit Is Shorted To Battery Voltage | ||
| B1215/15 | Door System Bus Communication Circuit Is Shorted To Ground | ||
| B1216/16 | Communication From Driver's Rear Door ECU To Body ECU Is Cut Off | ||
| B1217/17 | Communication From Passenger Rear Door ECU To Body ECU Is Cut Off | ||
| B1221/21 | (1) Power Window Master Switch Circuit | ||
| B1222/22 | (1) Driver's Door Lock Switch Circuit | ||
| B1223/23 | (1) Passenger's Front Window Switch Circuit | ||
| B1224/24 | (1) Passenger's Door Lock Switch Circuit | ||
| B1225/25 | (1) Passenger's Rear Window Switch Circuit | ||
| B1226/26 | (1) Driver's Rear Window Switch Circuit | ||
| B1231/31 | Driver's Jam Protection Limit Switch Circuit | ||
| B1232/32 | Driver's Jam Protection Pulse Switch Circuit | ||
| B1233/33 | Passenger's Front Jam Protection Limit Switch Circuit | ||
| B1234/34 | Passenger's Front Jam Protection Pulse Switch Circuit | ||
| B1235/35 | Passenger's Rear Jam Protection Limit Switch Circuit | ||
| B1236/36 | Passenger's Rear Jam Protection Pulse Switch Circuit | ||
| B1237/37 | Driver's Front Jam Protection Limit Switch Circuit | ||
| B1238/38 | Driver's Front Jam Protection Pulse Switch Circuit | ||
| B1241/41 | Body ECU Switch Circuit Diagnosis | ||
| B1242/42 | Wireless Door Lock Control ECU Circuit | ||
| B1243/43 | GSW Circuit Malfunction | ||
| B1244/44 | Light Sensor Circuit Malfunction | ||
| B1261/61 | Communication From ECM To Body ECU Is Cut Off | ||
| B1262/62 | Communication From A/C ECU To Body ECU Is Cut Off | ||
| B1266 | Instrument Panel Bus Communication Circuit Is Shorted To Battery Voltage | ||
| B1267 | Instrument Panel Bus Communication Circuit Is Shorted To Ground | ||
| B1271 | Communication From Instrument Cluster ECU To Body ECU Is Cut Off | ||
| B1272/72 | Communication From Power Seat W/Memory ECU To Body ECU Is Cut Off | ||
| B1273/73 | Communication From Sun Roof ECU To Body ECU Is Cut Off | ||
| B1275/75 | Communication From Accessory Bus To Body ECU Is Cut Off | ||
|
|||
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.