DTC Troubleshooting: U0155
DTC U0155:
 Headlight Leveling Control Unit Lost Communication with Gauge Control Module
  1. Clear the DTCs with the HDS.
  1. Turn the ignition switch to LOCK (0) and then back to ON (II).
  1. Wait for 6 seconds or more.
  1. Check for DTCs with the HDS.
Is DTC U0155 indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, the system is OK at this time. Check for loose or poor connections.■
  1. From the BODY ELECTRICAL system select menu, select UNIT INFORMATION, and then select CONNECTED UNIT.
Is the gauge control module detected?
YES -
Replace the headlight leveling control unit .■
NO -
Go to Step 6 .
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the gauge control module 32P connector.
  1. Disconnect the headlight leveling control unit 16P connector.
  1. Check for continuity between the gauge control module 32P connector No. 23 and No. 24 terminals and headlight leveling control unit 16P connector No. 15 and No. 16 terminals individually.
Is there continuity?
YES -
Go to the gauge control module input test, and do all power and ground input tests. If the tests prove OK, replace the gauge control module. ■
NO -
An open in the wire.■