Reading and Clearing Diagnostic Trouble Codes

The self-diagnostic system diagnoses sensors, door motors, blower motor and multiplex communication errors, etc. by system line. Refer to applicable sections (items) for details. Shifting from normal control to the self-diagnostic system is done as follows. Start the engine (turn the ignition switch from "OFF" to "ON"). And press OFF switch for at least 5 seconds. The OFF switch must be pressed within 10 seconds after starting the engine (ignition switch is turned "ON"). This system will be canceled by either pressing AUTO switch or turning ignition switch "OFF". Shifting from one step to another is accomplished by means of rotating temperature control switch, as required.
Additionally shifting from STEP 5 to AUXILIARY MECHANISM is accomplished by means of pushing, (Blower) switch.

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STEP-BY-STEP PROCEDURE

AUXILIARY MECHANISM: Temperature setting trimmer
This trimmer compensates for differences between temperature setting (displayed digitally) and temperature felt by driver in a range of 13 °C (16 °F).
Operating procedures for this trimmer are as follows:
Starting with STEP 5 under "Self-diagnostic mode", press (Blower) switch to set air conditioning system in auxiliary mode. Then, set temperature dial to desired temperature. Temperature will change at a rate of 0.5°C (1°F) each time a switch is turned.
When battery cable is disconnected, trimmer operation is canceled and temperature set becomes that of initial condition, i.e. 0 °C (0 °F).