Test Preparation
Remove the dashboard lower cover. Disconnect the 10-P connector from the integrated control unit. See Fig 1 . Remove the integrated control unit from the under-dash fuse/relay box. Inspect the connector 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 all the terminals are okay, make the following input test at the connector terminals. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove okay, the control unit must be faulty, replace it.