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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 133 (Multiplex Communication System) >> Diagnostic Tests >> DTC B1211: Driver Door Ecu Communication Stopped >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Lexus ES 300 and 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Disconnect body ECU 18-pin harness connector B5, driver door ECU 20-pin harness connector D17 and front passenger door ECU 20-pin harness connector F13. See Figure. Backprobing, check continuity of Gray/Black wire (MPX1 circuit) between body ECU 18-pin harness connector B5 terminal No. 11 and driver door ECU 20-pin harness connector D17 terminal No. 7. Also, check continuity of Gray/Blue wire (MPX2 circuit) between driver door ECU 20-pin harness connector D17 terminal No. 8 and front passenger door ECU 20-pin harness connector F13 terminal No. 8 by backprobing. See Figure and Fig 1 . If continuity exists, go to next step. If continuity does not exist, repair identified circuit, harness or connector between body ECU and driver door ECU, or between driver door ECU and front passenger door ECU and retest system. See COMPUTER DATA LINES under SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  2. With driver door ECU 20-pin harness connector D17 disconnected, check power feed circuits (BDR and CPUB) by backprobing between harness side of connector D17 terminals No. 9 (White/Red wire) and No. 10 (Blue/White wire) and good body ground point. See Fig 2. If 10-14 volts is present at both test points, go to next step. If 10-14 volts is not present at both test points, repair identified circuit, harness, connector or fuse(s) between driver door ECU and battery. See Fig 1.
  3. With driver door ECU 20-pin harness connector D17 disconnected, check ground circuit ("E") by backprobing between harness side of connector D17 terminal No. 2 (White/Black wire) and good body ground point. See Fig 3. If continuity does not exist, repair identified circuit, harness or connector between driver door ECU and vehicle ground point located under driver seat. See Fig 1. If continuity exists, replace driver door ECU. See DRIVER DOOR ECU & FRONT PASSENGER DOOR ECU  under REMOVAL & INSTALLATION.
  4. After repairs have been made, perform confirmation test. See CONFIRMATION TEST  under SELF-DIAGNOSTIC SYSTEM.
Fig 1: Driver Door ECU Wiring Diagram
G00173708Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Testing Driver Door ECU & Front Passenger Door ECU Power Feed Circuits
G00173710Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 3: Testing Driver Door ECU & Front Passenger Door ECU Ground Circuit
G00173711Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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