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P0645, P0647, P1647

Read the instructions below then start the fault diagnostic procedure.

Symptom: No A/C function.

P0645, P0647, P1647


P0647 A/C Relay Circuit. Short to B+.

P1647 A/C Relay Circuit. Open Circuit.


Fault symptoms


• No A/C function.


Conditions

The following conditions apply for this DTC:


• P0645, P0647: Signal on control module sensor output more than 4.7 V for more than 1.2 seconds. Diagnosis performed during active output.

• P1647: The signal on the control module output has detected a break lasting for more than 1.2 seconds. Diagnosis performed during inactive output.


Diagnostic help

Request from ACC/MPC must have come before diagnostics was carried out.

Activation of A/C relay output.

Note

A fault in the control module female connector can cause a trouble code. Check the contact for a bent pin, oxidation and tightness of pins. See Difficult faults in PSG16 despite trouble code