LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 1999 >> LS 400 >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Multiplex Control Systems >> Self-Diagnostics >> Diagnostic Trouble Code Definitions
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Trouble Code Definitions

MULTIPLEX DIAGNOSTIC TROUBLE CODE (DTC) DEFINITION

OBD-II DTC/2-Digit DTC Description
B1211/11  No Communication Between Driver's Door ECU & Body ECU
B1212/12  No Communication Between Passenger's Front Door ECU & Body ECU
B1213/13  No Communication Between Tilt & Telescopic ECU & Body ECU
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  No Communication Between Right Rear Door ECU & Body ECU
B1217/17  No Communication Between Left Rear Door ECU & Body ECU
B1221/21  (1) Power Window Master Switch Circuit
B1222/22  (1) Driver's Door Lock Control Switch Circuit
B1223/23  (1) Passenger's Front Window Switch Circuit
B1224/24  (1) Passenger's Door Lock Control Switch Circuit
B1225/25  (1) Right Rear Window Switch Circuit
B1226/26  (1) Left 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  Right Rear Jam Protection Limit Switch Circuit
B1236/36  Right Rear Jam Protection Pulse Switch Circuit
B1237/37  Left Rear Jam Protection Limit Switch Circuit
B1238/38  Left Rear Jam Protection Pulse Switch Circuit
B1241/41  Body ECU Switch Circuit Diagnosis
B1242/42  Wireless Door Lock Tuner Circuit Malfunction
B1243/43  GSW Terminal Circuit Malfunction
B1244/44  Light Sensor Circuit Malfunction
B1261/61  No Communication Between ECM & Body ECU
B1262/62  No Communication Between A/C Control Assembly & Body ECU
B1266/66  Instrument Panel System Bus Communication Circuit Is Shorted To Battery Voltage
B1267/67  Instrument Panel System Bus Communication Circuit Is Shorted To Ground
B1271/71  No Communication Between Combination Meter ECU & Body ECU
B1272/72  No Communication Between Power Seat ECU (W/Memory) & Body ECU
B1273/73  No Communication Between Sun Roof Control Relay & Body ECU
B1275/75  No Communication Between Accessory Bus Buffer & Body ECU
(1) DTC is not a malfunction. DTC displays switch function. If DTC is not displayed when switch is operated, failure in switch contact exists. If DTC is displayed when switch is not operated, switch is stuck.