| DTC B1031: | Ultrasonic Signal Error |
| 1. | Clear the DTCs with the HDS. |
| 2. | Turn the ignition switch OFF, and then back ON (II). |
| 3. | Check for DTCs with the HDS. Is DTC B1031 indicated? YES - Go to 4. NO - Intermittent failure, the system is OK at this time.n |
| 4. | Do the ultrasonic sensor input test, and check power supply and ground for ultrasonic sensor. Do all of the input tests prove OK? YES - Go to 5. NO - If any input tests indicate a problem, find and correct them, then recheck the systemn |
| 5. | Do the alarm control siren input test, and check power supply and ground for alarm control siren. Do all of the input tests prove OK? YES - Faulty alarm control siren.n NO - If any input tests indicate a problem, find and correct them, then recheck the system.n |