B1080

DTC B1080: Power Supply Circuit (IG1 Line) Input Error for Relay Control Module and MICU

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.

1. Clear the DTC with the HDS.
2. Turn the ignition switch OFF, and then back ON (II).
3. Wait for 6 seconds or more.
4. Check for DTCs with the HDS.

Is DTC B1080 indicated?

YES - Go to step 5.

NO - Intermittent failure, check for loose or poor connections at under-hood fuse/relay box connector J (10P) and driver's under-dash fuse/relay box connector D (17P). If the connections are OK, check the battery condition and the charging system.

5. Check the MICU IG1 power supply No. 21 (10 A) fuse in the driver's under-dash fuse/relay box.

Is the fuse OK?

YES - Go to step 6.

NO - Replace the fuse, and recheck for DTCs.

6. Turn the ignition switch OFF.
7. Disconnect under-hood fuse/relay box connector J (10P), check for loose or poor connections. If the terminals are bent, loose or corroded, repair them as necessary and recheck the system.
8. Reconnect under-hood fuse/relay box connector J (10P).
9. Turn the ignition switch ON (II).
10. Measure the voltage between the No. 8 terminal of the under-hood fuse/relay box connector J (10P) and body ground.






Is there battery voltage?

YES - Go to step 11.

NO - Open, or loose connection, in the wire between the under-hood fuse/relay box and the driver's under-dash fuse/relay box. Repair the wire, and recheck for DTCs.

11. Measure the voltage between the No. 10 terminal of under-hood fuse/relay box connector J (10P) and body ground.






Is there less than 0.5 V?

YES - Faulty relay control module; replace the under-hood fuse/relay box.

NO - Repair an open in the wire between the under-hood fuse/relay box and G301. If the wire is OK, inspect the G301.

DTC Troubleshooting Index

NOTE: Record all DTCs, and sort them by DTC type using the DTC troubleshooting index, then troubleshoot the DTC(s) in this order:

- Battery voltage DTCs
- Internal error DTCs
- Loss of communication DTCs (beginning with the lowest number first; for example, if B1008 and B1011 are retrieved, troubleshoot B1008 first).
- Signal error DTCs

B1000 - B1575:

B1050 - B1080:

B1132 - B1182:

B1200 - B2991:

B1250 - B1284:

B1600 - B1675:

B1750 - B1848:

B2100 - B2146:

B2150 - B2191: