Diagnosis System

1. The power window control system data can be read from the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use Techstream to check for malfunctions and perform repairs.

1. Check the DLC3 (See HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS ).

1. Measure the battery voltage.

   Standard voltage: 11 to 14 V 

   If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.

HINT:

If there is a malfunction in the pulse sensor, manually operating the power window switch will cause the power window switch light to blink.

1. Turn the ignition switch on (IG).
2. Manually operate the power window master switch or power window switch on each door.
   Fig 1: Identifying Power Window Master Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check the blinking pattern of the AUTO light as shown below.
   1. If pattern (A) is displayed, check the wire harness or power window ECU.
   2. If pattern (B) is displayed, check the power window regulator motor or power window ECU.
   3. If the normal pattern is displayed, replace the power window regulator master switch.
   Fig 2: Identifying AUTO Light Blinking Pattern

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002