Code No. P0646:
A/C Compressor Relay Circuit Low
DIAGNOSIS CONTENT
Short circuit to earth
TROUBLE JUDGMENT
Check Condition
Judgment Criterion
- The digital power stage hardware reports a short circuit to earth error.
PROBABLE CAUSE
- Failed A/C compressor relay
- Failed electrical harness in A/C compressor relay circuit
(Refer to Symptom Procedure - A/C Compressor Relay System 
.)