Checksum Failure (Active)

Test 1:

SYMPTOM
CHECKSUM FAILURE (ACTIVE)

TEST NOTE
This symptom is diagnosed using the test A/C SWITCH FAULT (ACTIVE).

WHEN MONITORED
At every power up (five seconds after ignition is on).

SET CONDITION
This DTC will set if the calculated check sum does not match the stored value.

POSSIBLE CAUSE
- A/C-heater control module