P0646

P0646 - A/C Clutch Relay Control Circuit Low.

DTC Description
P0646 P0646 - A/C clutch relay control circuit.: Short circuit to ground.

Possible Causes:
1. Connectors C0331, C0576.
2. Open circuit C0331/29 (UB) - C0576/11 (UB).
3. Short circuit C0331/29 (UB) - Ground.
4. Aircon clutch relay.
5. MS43 ECM.

Step 1-5: