Diagnosis Item 20: Diagnose when the M.U.T.-III cannot receive the data sent by heater control panel <vehicles without A/C> or A/C control panel <vehicles with A/C>

caution

When servicing a CAN bus line, earth yourself by touching a metal object such as an unpainted water pipe. If you fail to do, a component connected to the CAN bus line may be broken.

FUNCTION

TROUBLE JUDGEMENT CONDITIONS

TROUBLESHOOTING HINTS

Malfunction of the connector [joint connector (CAN1) or heater control panel <vehicles without A/C> or A/C control panel <vehicles with A/C> connector improperly connected]
Malfunction of the wiring harness [open circuit between the heater control panel <vehicles without A/C> or A/C control panel <vehicles with A/C> connector and the joint connector (CAN1), or power supply circuit to the heater control panel <vehicles without A/C> or A/C control panel <vehicles with A/C>]
Malfunction of the heater control panel <vehicles without A/C> or A/C control panel <vehicles with A/C>