Audio Communication Line Circuit Troubleshooting
  1. Check for continuity between body ground and heater control unit connector A (28P) No. 19 and No. 20 terminals individually.
Is there continuity?
YES -
Repair short to body ground in the wire between heater control unit connector A (28P) and the center display unit 12P connector.■
NO -
Go to Step 4 .
  1. Reconnect heater control unit connector A (28P).