Checksum Failure

CHECKSUM FAILURE

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

SET CONDITION
If the calculated check sum does not match the stored value.

POSSIBLE CAUSES
- A/C heater control

NOTE: This DTC must be active for the result of this test to be valid. Do not perform this test if this DTC is stored. Refer to HVAC System Test for stored DTC test procedures. HVAC System Test

Diagnostic Test

1. REPLACE THE A/C HEATER CONTROL

Repair
Replace the A/C Heater Control. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test