( TL19E00K733000U0155FAAT00 )

DTC Troubleshooting: U0155

DTC U0155:
Heater 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 1.

1. Clear the DTC with the HDS.

1. Turn the ignition switch to LOCK (0) and then to ON (II).

1. Do the self-diagnostic function with the HDS.

1. Check for DTCs.

Is DTC U0155 indicated?

YES | - | Go to Step 5 .
NO | - | The system is OK at this time. Check for loose wires or poor connections on the gauge control module and the heater control unit circuit.■

1. Select UNIT INFORMATION in the BODY ELECTRICAL menu.

1. Select CONNECTED UNIT in the UNIT INFORMATION menu.

Is the gauge control module detected?

YES | - | Substitute a known-good heater control unit, and recheck. If the symptom/indication goes away, replace the original heater control unit. ■
NO | - | Go to Step 7 .

1. Disconnect the gauge control module 32P connector.

1. Disconnect heater control unit connector B (12P).

1. Check for continuity between the following terminals of the gauge control module 32P connector, and heater control unit connector B (12P).

   12P: | 32P:
   --- | ---
   No. 1 | No. 24
   No. 2 | No. 23

Is there continuity?

YES | - | Go to the gauge control module input test.■
NO | - | Repair open in the wire between the heater control unit and the gauge control module.■