Climate Control/Navigation Communication Line Circuit Troubleshooting
  1. Connect navigation unit connector A (20P) terminals No. 4, 14, and 15 with a jumper wire.
  1. Turn the ignition switch ON (II).
  1. Press the RECIRCULATION CONTROL and OFF buttons.
Does the RECIRCULATION CONTROL indicator turn on?
YES -
Do the Unit check with the navigation system. ■
NO -
Substitute a known-good climate control unit, and recheck. If the symptom goes away, replace the original climate control unit .■