Keyless/Power Door Locks/Security System (MICU And Door Multiplex Control Unit) Input Test

Keyless/Power Door Locks/Security System (MICU and Door Multiplex Control Unit) Input Test

NOTE: Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A, and make sure the lighting system works properly.

MICU

1. Turn the ignition switch to LOCK (0), and remove the driver's dashboard lower cover Driver's Dashboard Lower Cover Removal/Installation.

2. Disconnect under-dash fuse/relay box connectors D, E, F, G, K, M, N, R, and T.

NOTE: All connector views are shown from the wire side of female terminals.






3. Inspect the connector and socket terminals to be sure they are all making good contact.

- If the terminals are bent, loose, or corroded, repair them as necessary and recheck the system.
- If the terminals look OK, go to step 4.

4. With the connectors still disconnected, do the following input tests.

- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, go to step 5.

NOTE: Before testing, make sure the No. 10 (7.5 A) fuse in the under-dash fuse/relay box.










5. Reconnect the connectors to the under-dash fuse/relay box, and do the following input tests.

- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, go to step 6.


























Door Multiplex Control Unit

6. Turn the ignition switch to LOCK (0), and remove the power window master switch Power Window Master Switch Replacement.

7. Disconnect the 37P connector from the door multiplex control unit.






8. Inspect the connector and socket terminals to be sure they are all making good contact.

- If the terminals are bent, loose, or corroded, repair them as necessary and recheck the system.
- If the terminals look OK, go to step 9.

9. With the connector still disconnected, do the following input test.

- If any test indicates a problem, find and correct the cause, then recheck the system.
- If the input test proves OK, go to step 10.





10. Reconnect the 37P connector to the door multiplex control unit, and do the following input tests.

- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, go to step 11.










Front Passenger's Power Window Switch

11. Turn the ignition switch to LOCK (0), and remove the front passenger's power window switch Front Passenger's Power Window Switch Replacement.

12. Disconnect the 37P connector from the front passenger's power window switch.





13. Inspect the connector and socket terminals to be sure they are all making good contact.

- If the terminals are bent, loose, or corroded, repair them as necessary and recheck the system.
- If the terminals look OK, go to step 14.

14. Reconnect the 37P connector to the front passenger's power window switch, and do the following input tests.

- If any test indicates a problem, find and correct the cause, then recheck the system.
- If the input test proves OK, go to step 15.





15. If multiple failures are found on more than one control unit, replace the under-dash fuse/relay box (includes the MICU) Under-Dash Fuse/Relay Box Removal And Installation. If input failures are related to a particular control unit, replace the control unit.