2. Disconnect the connectors from the fuse and relay box located under the control panel.
Note. The view of all connectors is given from the wire side of the terminal outputs.
3. Check the socket and connector terminals to make sure they are making good contact.
If the terminals are bent, loose, or corroded, correct them and recheck the connections.
If the terminals are OK, go to step 4.
4. Without connecting the connectors, perform these checks on the corresponding connectors.
If any test indicates a malfunction, find and eliminate the cause and repeat the test.
If all input signal checks show no problem, go to step 5.
5. Connect all connectors on the under-dash fuse/relay box and test the inputs of the corresponding fuse/relay box connectors.
If any test indicates a malfunction, find and eliminate the cause and repeat the test.
If all checks on the input signals do not reveal a malfunction, the multiplex integrated control unit is obviously faulty (MICU); Replace the fuse and relay box assembly.