Checksum Failure (Active)

Test 1:

SYMPTOM
CHECKSUM FAILURE (ACTIVE) - MTC

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

WHEN MONITORED
With the ignition on.

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

POSSIBLE CAUSES
- A/C - Heater control module