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.

Check back door ECU.
NOTE: This inspection diagnoses the back door ECU to determine if it works normally or not.

Check that the operation of the back door function is normal.
1. NG : Replace the back door ECU.
2. OK : Go to next step.
Check wire harness .
Preparation : Disconnect the connector "F18" of passenger door ECU, see Figure, "B11" of back door ECU and "C6" of combination meter ECU, see Figure and Figure .

Check
1. Verify continuity between terminals "MPX1" of passenger door ECU and "MPX2" of back door ECU.
2. Verify continuity between terminals "MPX1" of back door ECU and "MPX2" of combination meter ECU.
OK

There is continuity in wire harness of both a or b .

NOTE: If there is open in wire harness of either a or b , please repair it.
1. NG : Repair or replace wire harness.
2. OK : Replace the back door ECU.