( TL19E00G24100013131FAAT00 )

Audio Communication Line Circuit Troubleshooting

1. Disconnect climate control unit connector A (28P) and the center display unit 12P connector.

1. Check for continuity between the following terminals of heater control unit connector A (28P) and the center display unit 12P connector.

   28P: | 12P:
   --- | ---
   No. 19 | No. 7
   No. 20 | No. 8

Is there continuity?

YES | - | Go to Step 3 .
NO | - | Repair open in the wire between heater control unit connector A (28P) and the center display unit 12P connector.■

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).

1. Connect the center display unit 12P connector No. 7 and No. 8 terminals with a jumper wire.

1. Turn the ignition switch to ON (II).

1. Press and hold the DEF button and OFF button.

Is the DEF button LED blinking?

YES | - | Center display unit is faulty, replace the center display unit.
NO | - | Heater control unit is faulty, replace the heater control unit.