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
With the ignition ON.

SET CONDITION
This DTC Will set if the calibrated check sum does not match the stored value.

POSSIBLE CAUSES
- A/C - heater control module