Diagnostic Trouble Code Chart

WARNING: This page is about a different car, the 2006 Lexus GS 430 and 2006 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.

If a malfunction code is display during the DTC check, check the circuit corresponding to the code in the table below. Proceed to the page given for the circuit.

DIAGNOSTIC TROUBLE CODE CHART

DTC No.	Detection Item	Trouble Area
B1200	MPX Body ECU Stop	Multiplex network body ECU (cowl side junction block ECU RH) Wire harness
B1204	Driver Side Seat Switch ECU Communication Stop	Integration control and panel assembly Wire harness
B1205	AFS ECU Communication Stop	Headlight swivel ECU assembly Wire harness
B1206	P/W Master Switch Communication Stop	Multiplex network master switch assembly Wire harness
B1207	Smart ECU Stop	Certification ECU Wire harness
B1210	Power ECU Stop	Power source control ECU Wire harness
B1211	Driver Door ECU Communication Stop	Multiplex network door ECU front LH (driver side door ECU) Wire harness
B1212	Front Passenger Door ECU Communication Stop	Multiplex network door ECU front RH (front passenger side door ECU) Wire harness
B1213	Tilt and Telescopic ECU Communication Stop	Multiplex tilt and telescopic ECU Wire harness
B1214	Door System Communication Bus Malfunction (+B Short)	Certification ECU Position control ECU and switch assembly (front passenger side) Multiplex network door ECU front RH (front passenger side door ECU) Multiplex network door ECU rear RH (rear door RH) Multiplex network switch (rear RH) Multiplex network door ECU rear LH (rear door LH) Multiplex network switch (rear LH) Multiplex network door ECU front LH (driver side door ECU) Multiplex network master switch assembly Sliding roof control ECU Overhead junction block Power source control ECU Network gateway ECU Wire harness
B1215	Door System Communication Bus Malfunction (GND Short)	Certification ECU Position control ECU and switch assembly (front passenger side) Multiplex network door ECU front RH (front passenger side door ECU) Multiplex network door ECU rear RH (rear door RH) Multiplex network switch (rear RH) Multiplex network door ECU rear LH (rear door LH) Multiplex network switch (rear LH) Multiplex network door ECU front LH (driver side door ECU) Multiplex network master switch assembly Sliding roof control ECU Overhead junction block Power source control ECU Network gateway ECU Wire harness
B1216	Rear Door ECU RH Communication Stop	Multiplex network door ECU rear RH (rear door RH) Wire harness
B1217	Rear Door ECU LH Communication Stop	Multiplex network door ECU rear LH (rear door LH) Wire harness
B1247	Tire Pressure Monitor Receiver Communication Stop	Tire pressure warning ECU Wire harness
B1248	AVC-LAN Communication Impossible	Radio and player ECU Wire harness
B1262	A/C ECU Communication Stop	A/C amplifier assembly No. 2 (A/C ECU) Wire harness
B1263	Luggage Room Junction Block ECU Communication Stop	Multiplex network rear ECU (luggage room junction block ECU) Wire harness
B1266	Instrument Panel System Communication Bus Malfunction (+B Short)	Combination switch assembly (windshield wiper switch) Center airbag sensor assembly A/C amplifier assembly No. 2 (A/C ECU) Integration control and panel assembly (mirror switch) Network gateway ECU Wire harness
B1267	Instrument Panel System Communication Bus Malfunction (GND Short)	Combination switch assembly (windshield wiper switch) Airbag sensor assembly center A/C amplifier assembly No. 2 (A/C ECU) Integration control and panel assembly (mirror switch) Network gateway ECU Wire harness
B1271	Combination Meter ECU Communication Stop	Combination meter assembly (meter ECU) Wire harness
B1272	Power Seat ECU Communication Stop	Position control ECU and switch assembly (driver side) Wire harness
B1273	Sliding Roof ECU Communication Stop	Sliding roof control ECU Wire harness
B1278	Combination Switch ECU Communication Stop	Combination switch assembly (windshield wiper switch) Wire harness
B1279	Rain Sensor Communication Stop	Rain sensor Wire harness
B1280	Left Side Junction Block ECU Communication Stop	Cowl side junction block LH (cowl side junction block ECU LH) Wire harness
B1281	Airbag ECU Communication Stop	Center airbag sensor assembly Wire harness
B1289	Passenger Seat ECU Communication Stop	Position control ECU and switch assembly (front passenger side) Wire harness
B1291	Light System Communication Bus Malfunction (+B Short)	Cowl side junction block RH (cowl side junction block ECU RH) Multiplex tilt and telescopic ECU Combination switch assembly (windshield wiper switch) Headlight swivel ECU assembly (w/ AFS) Front controller (w/o AFS) Cowl side junction block LH (cowl side junction block ECU LH) Position control ECU and switch assembly (driver side) Luggage room junction block ECU Network gateway ECU Wire harness
B1292	Light System Communication Bus Malfunction (GND Short)	Cowl side junction block RH (cowl side junction block ECU RH) Multiplex tilt and telescopic ECU Combination switch assembly (windshield wiper switch) Headlight swivel ECU assembly (w/ AFS) Front controller (w/o AFS) Cowl side junction block LH (cowl side junction block ECU LH) Position control ECU and switch assembly (driver side) Luggage room junction block ECU Network gateway ECU Wire harness
B1296	Front Light ECU Communication Stop	Engine room No. 2 relay block (front controller) Wire harness
B1297	Clearance Sonar ECU Communication Stop	Clearance warning ECU assembly Wire harness

When "+B of GND short malfunction of communication bus" DTCs (B1214, B1215, etc.) are detected at the same time as "communication stop" DTCs (B1211, B1212, etc.), please repair the "+B or GND short malfunction of communication bus" DTCs first.