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P0646

Read the instructions below then start the fault diagnostic procedure.

Symptom: Continuous function of A/C.

P0646


A/C Relay Circuit. Short to Ground.


Fault symptoms


• Continuous function of A/C.


Conditions

The following conditions apply for this DTC:


• The signal from the control module output is less than 0.4 V 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