Driver Door Control System
WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Prior to trouble shooting driver door control system, check multiplex system for proper operation and stored codes. The body control ECU stores Diagnostic Trouble Codes (DTCs) for the multiplex system and is the access point to communicate with other ECUs on the multiplex communication circuit. Ensure driver door ECU is able to communicate with other ECUs on multiplex communication circuit. See MULTIPLEX CONTROL SYSTEMS - AVALON
article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.
- Trouble shooting of a driver door control system complaint begins with verification of the customer problem. Perform Customer Problem Analysis (Driver Door Control System Check List). See Fig 1. If problem occurs, go to step 3. If problem does not occur, go to next step.
- If problem does not occur, review conditions under which problem occurred for customer. For example, if the problem occurs on rainy days or during high humidity conditions, sprinkle water onto vehicle and see if malfunction occurs. DO NOT sprinkle water directly into engine compartment or onto electronic components. Visually inspect for signs of mechanical and electrical damage. Inspect for blown fuses and damaged relays. Inspect for loose or corroded connections, damaged wiring harnesses and/or switches. Check for a broken or partially broken wire inside insulation, which could cause system malfunction but prove good in a continuity/voltage check with system disconnected. Ensure any aftermarket electronic equipment is properly installed. If fault is found, repair as necessary. If problem still cannot be created, go to next step.
- Ensure multiplex communication system is operating correctly and no faults are present by performing basic inspection and checking for multiplex communication system Diagnostic Trouble Codes (DTCs). See BASIC INSPECTION and RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM under MULTIPLEX CONTROL SYSTEMS - AVALON article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT. If multiplex communication system is operational and no DTCs are present, go to next step. If multiplex communication system is not operational or DTCs are present, repair multiplex communication system and retest.
- When proper communication with multiplex control system is established, trouble shoot appropriate driver door control system by symptom and perform associated test. See DRIVER DOOR CONTROL SYSTEM under SYSTEM TESTS. When performing trouble shooting for driver door control system, it may be necessary to perform pin voltage tests on driver door ECU to ensure proper voltage or input/output signals exist. See DRIVER DOOR ELECTRONIC CONTROL UNIT under PIN VOLTAGE TESTS when directed by trouble shooting procedure.
- After problem has been identified and repaired, confirm repairs have resolved complaint. See CONFIRMATION TEST under SYSTEM TESTS.