Trouble Shooting Procedure (Driver Door Control System)

NOTE: Driver door control system is used to control the following systems on driver's door: power window, door courtesy light and key related functions. Trouble shooting procedure is for any of these systems on the driver's door.

To ensure correct trouble shooting procedures are followed, trouble shooting should be done in the following sequence:

Record Customer Complaint

Ensure all customer complaints or observations are recorded.

Confirm Symptoms

Determine if original symptoms still exist.

Diagnose & Repair

Ensure driver's door Electronic Control Unit (ECU) is able to communicate with rest of multiplex control system. See MULTIPLEX CONTROL SYSTEMS - SEQUOIA article. Once proper communication with multiplex control system is established, trouble shoot appropriate system by symptom and perform appropriate test listed under SYSTEM TESTS. See SYMPTOM INDEX (DRIVER DOOR CONTROL SYSTEM) table under SYSTEM TESTS. When performing trouble shooting for driver door control system, it may be necessary to perform pin voltage test for driver's door ECU to ensure proper voltage or input signal exists. See DRIVER'S DOOR ELECTRONIC CONTROL UNIT under PIN VOLTAGE TESTS.

Verification Procedure

Ensure all symptoms and/or complaints have been repaired.