Inspection Procedure

WARNING: This page is about a different car, the 2002 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Before ECU replacement, see HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS to ensure all communication line/bus/wire issues have been eliminated as a cause of communication loss.

NOTE: This inspection diagnoses if the passenger door ECU works normally or not.

Check passenger door ECU.
Check operation of passenger door window glass auto up.
1. NG : Replace the passenger door ECU.
2. OK : Go to next step.
Check wire harness :
Preparation : Disconnect ECU connectors "D22" of driver door ECU, see Figure, "F18" of passenger door ECU, see Figure, and "B11" of back door ECU, see Figure.

Check
1. Verify continuity between terminals "MPX1" of driver door ECU and "MPX2" of passenger door ECU.
2. Verify continuity between terminals "MPX1" of passenger door ECU and "MPX2" of back door ECU.
NOTE: If there is an open in wire harness of either a or b , please repair it.

OK : There is a continuity in wire harness of both a and b .
1. NG : Repair or replace wire harness.
2. OK : Replace the passenger door ECU.