Hint:
Past problems that seem unrelated may also help in some cases.

Operation flow
Symptom confirmation and diagnostic trouble codeInspection
Inspect water pump assembly
Visually check the drain hole for coolant leakage.
If leakage is found, replace the water pump
assembly.
Turn the pulley, and then check that the water pump
bearing moves smoothly without making a "click"
noise.
If it does not move s ...
Diagnosis system
Description
Sliding roof system data and diagnostic trouble
codes (dtcs) can be read through the vehicle's
data link connector 3 (dlc3). When the system
seems to be malfunctioning, use the intelligent
tester to check for malfunctions and perform repairs.
Check dlc3
The vehi ...
Air mix damper control servo motor circuit (driver
side)
Description
The air mix damper servo sends pulse signals to indicate the damper position
to the air conditioning
amplifier. The air conditioning amplifier activates the motor (normal or
reverse) based on these signals to
move the air mix damper (driver seat) to the appropriate position. T ...