DTC Troubleshooting: U0164
DTC U0164:
 Door Multiplex Control Unit Lost Communication with Climate Control Unit/Heater Control Unit
  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 U0164 indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, the system is OK at this time. Check for loose or poor connections between the door multiplex control unit and climate control unit/heater control unit.■
  1. From the BODY ELECTRICAL system select menu, select UNIT INFORMATION, and then select CONNECTED UNIT to see if the climate control unit/heater control unit is communicating with the HDS.
Is the climate control unit/heater control unit detected?
YES -
Replace the power window master switch. ■
NO -
Go to Step 6 .
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the door multiplex control unit 37P connector.
  1. Disconnect the climate control unit/heater control unit connector B (12P).
  1. Check for continuity between the door multiplex control unit 37P connector No. 33 and No. 35 terminals and the climate control unit/heater control unit connector B (12P) No. 1 and No. 2 terminals individually.
Is there continuity?
YES -
Replace the climate control unit/ heater control unit .■
NO -
Repair an open in the wire.■