Right Power Sliding Door Control Unit

DTC Troubleshooting: U128D

DTC U128D:

Right Power Sliding Door Control Unit Lost Communication With Gauge Control Module

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).

3. Wait for at least 6 seconds.

4. Check for DTCs with the HDS.

Is DTC U128D indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connections between the right power sliding door control unit and the gauge control module.

5. From the BODY ELECTRICAL SYSTEM SELECT menu, select B-CAN CONTROL UNITS INFORMATION, and then select CHECK CONNECTED CONTROL UNITS.

Is the gauge control module detected?

YES -

Go to step 10.

NO -

Go to step 6.

6. Measure the voltage between body ground and gauge control module 32P connector terminals No. 1 and No. 17 individually.





Is there battery voltage?

YES -

Go to step 9.

NO -

Go to step 7.

7. Turn the ignition switch to LOCK (0).

8. Check the No. B16 (10 A) fuse in the under-hood fuse/relay box and the No. C11 (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. B16 (10 A) and/or No. C11 (7.5 A) fuse circuit.

NO -

Replace the fuse(s). If the fuse blows again, repair a short to ground on the No. B16 (10 A) and/or No. C11 (7.5 A) fuse circuit.

9. Measure the voltage between body ground and gauge control module 32P connector terminal No. 4.





Is there less than 0.2 V?

YES -

Go to step 10.

NO -

Repair an open or high resistance in the ground wire or poor ground (G401).

10. Turn the ignition switch to LOCK (0).

11. Disconnect right power sliding door control unit connector B (16P).

12. Disconnect the gauge control module 32P connector.

13. Check for continuity between right power sliding door control unit connector B (16P) terminals No. 12 and No. 14 and gauge control module 32P connector terminals No. 29 and No. 30 respectively.





Is there continuity?

YES -

Replace the gauge control module Service and Repair.

NO -

Repair an open or poor connection in the B-CAN wire(s) between the right power sliding door control unit and the gauge control module.