Multiplex Integrated Control System MICU Input Test

Multiplex Integrated Control System MICU Input Test

1. Turn the ignition switch to LOCK (0).

2. Remove the fuse access panel. Dashboard Fuse Access Panel Removal/Installation

3. Disconnect under-dash fuse/relay box connectors K, M, N, and Q.
NOTE: All connector views are shown from wire side of female terminals.

4. 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 5.

5. With the connectors still disconnected, do these input tests at the following connectors.
- 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.










6. Reconnect the connectors to the under-dash fuse/relay box, turn the ignition switch to ON (II), and do these input tests at the following connectors.
- If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, the MICU must be faulty; replace the under-dash fuse/relay box. Under-Dash Fuse/Relay Box Removal And Installation (Canada Models)

NOTE: These are power and ground tests for the multiplex integrated control unit.