Diagnostic Procedure
WARNING: This page is about a different car, the 2003 Lexus RX 300 and 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
If not using the hand-held tester, begin with step 3.
- Check the M1, M2 SET switch operation. Connect the hand-held tester to the DLC3. See Fig 1. Turn the ignition switch ON and hand-held tester main switch ON. Select the DATA LIST mode on the hand-held tester. Check that switch status (ON/OFF) changes on the screen of the hand-held tester as M1 and M2 SET switches. If the switch status changes in the same way as the vehicle switch operation, go to the next step. If the results are not as specified, go to step 3.
- Check the power seat position memory function. Disconnect the negative (-) terminal of the battery, after 5 minutes reconnect it. Reset the memory of the power seat position ECU. Connect the hand-held tester to the DLC3. Turn the ignition switch ON and the hand-held tester main switch ON. Select the DATA LIST mode on the hand-held tester. When the driving position is recorded in the memory by turning M1 and M2 switches of the vehicle, check that memory status changes from Not Memorized to Memorized on the screen of the hand-held tester. If the switch status changes in the same way as the vehicle switch operation, inspect the power seat position ECU. If the results are not as specified, check and replace the power seat position ECU.
- Check the M1, M2 SET switch. If the results are OK, check and repair the wiring harness or connector between the driver door ECU and switch. If the results are not OK, replace the M1, M2 and SET switches. The switches are located on lower finish panel, see appropriate INSTRUMENT PANEL article for removal and installation procedure.