Driver's MICU

DTC Troubleshooting: U1283

DTC U1283:

Driver's MICU Lost Communication With Passenger's MICU

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

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to LOCK (0), and then back to ON (II), or press the engine start/stop button to select the OFF mode and then the ON mode.

3. Wait for at least 6 seconds.

4. Check for DTCs with the HDS.

Is DTC U1283 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connections between the driver's MICU and the passenger's MICU.

5. Measure the voltage between body ground and passenger's under-dash fuse/relay box connector A (38P) terminals No. 14 and No. 35 individually.





Is there battery voltage?

YES -

Go to step 8.

NO -

Go to step 6.

6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

7. Check the No. 15 (10 A) fuse in the under-hood fuse/relay box and the No. 12 (7.5 A) fuse in the driver's under-dash fuse/relay box.

Are the fuses OK?

YES -

Repair an open or high resistance in the No. 15 (10 A) and/or No. 12 (7.5 A) fuse circuit.

NO -

Replace the fuse(s). If the fuse blows again, repair a short to ground on the No. 15 (10 A) and/or No. 12 (7.5 A) fuse circuit.

8. Measure the voltage between body ground and passenger's under-dash fuse/relay box connector A (38P) and E (18P) terminals as shown.













Is there less than 0.2 V?

YES -

Go to step 9.

NO -

Repair an open or high resistance in the ground wire(s) or poor ground (G203), (G402), and/or (G405).

9. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

10. Disconnect passenger's under-dash fuse/relay box connector A (38P).

11. Disconnect driver's under-dash fuse/relay box connector P (20P).

12. Check for continuity between passenger's under-dash fuse/relay box connector A (38P) terminals No. 11 and No. 29 and driver's under-dash fuse/relay box connector P (20P) terminals No. 6 and No. 5 respectively.





Is there continuity?

YES -

Faulty driver's MICU; replace the driver's under-dash fuse/relay box Drivers Under-Dash Fuse/Relay Box (Drivers MICU) Removal and Installation.

NO -

Repair an open or poor connection in the B-CAN wire(s) between the driver's MICU and the passenger's MICU.