MULTIPLEX COMMUNICATION: MULTIPLEX COMMUNICATION SYSTEM: B1214,B1215; Short to B+ in Door System Communication Bus Malfunction; 2007 MY LX470 [08/2006

Last Modified: 7-3-2017	6.8:8.0.40	Doc ID: RM0000017WT006X
Model Year Start: 2007	Model: LX470	Prod Date Range: [08/2006 - ]
Title: MULTIPLEX COMMUNICATION: MULTIPLEX COMMUNICATION SYSTEM: B1214,B1215; Short to B+ in Door System Communication Bus Malfunction; 2007 MY LX470 [08/2006 - ]

DTC

B1214

Short to B+ in Door System Communication Bus Malfunction

DTC

B1215

Short to GND in Door System Communication Bus Malfunction

DESCRIPTION

This DTC is output when a +B or GND short occurs on the door system communication bus.

DTC No.	DTC Detection Condition	Trouble Area
B1214	Door system communication circuit and +B battery system short	Power window regulator master switch assembly Power window regulator switch assembly (front RH door ECU) Power window regulator switch assembly (rear LH door ECU) Power window regulator switch assembly (rear RH door ECU) Multiplex network body ECU (main) Wire harness
B1215	Door system communication circuit and body ground short	Power window regulator master switch assembly Power window regulator switch assembly (front RH door ECU) Power window regulator switch assembly (rear LH door ECU) Power window regulator switch assembly (rear RH door ECU) Multiplex network body ECU (main) Wire harness

1.	CHECK COMMUNICATION CIRCUIT INSIDE ECU

(a) Disconnect the following ECU connectors in the order shown in the list below.

HINT:

Before disconnecting the next connector, be sure that the disconnected ECU connector is reconnected.

(b) Check the DTC whenever each connector is disconnected.

Disconnect ECU connector	Connector No.
Power window regulator master switch assembly	P15
Power window regulator switch assembly (Front RH door ECU)	P12
Power window regulator switch assembly (Rear LH door ECU)	P13
Power window regulator switch assembly (Rear RH door ECU)	P14

OK:

DTC B1214 or B1215 is not output.

REPLACE CORRESPONDING ECU (IF DTC IS NOT OUTPUT WHEN CONNECTOR IS DISCONNECTED, ECU IS DEFECTIVE)

2.	CHECK FOR SHORT CIRCUIT

(a) Disconnect the following ECU connectors in the order shown in the list below.

HINT:

Before disconnecting the next connector, be sure to reconnect the ECU connector that is disconnected.

(b) Check whether or not there is +B short and GND short between the connectors below.

Disconnect ECU connector

Connector No.

Multiplex network body ECU (Main)

Power window regulator master switch assembly

P15

Multiplex network body ECU (Main)

Power window regulator switch assembly (Front RH door ECU)

P12

Multiplex network body ECU (Main)

Power window regulator switch assembly (Rear LH door ECU)

P13

Multiplex network body ECU (Main)

Power window regulator switch assembly (Rear RH door ECU)

P14

OK:

No +B short and GND short.

REPAIR OR REPLACE HARNESS AND CONNECTOR

REPLACE MULTIPLEX NETWORK BODY ECU (MAIN)