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ME9 / P0646 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: No cooling.

  P0646 00


A/C Relay Circuit, Short to Ground

Fault symptom

No cooling.

On-board diagnosis

Type of diagnosis:

Continuous

Enable criteria:

Battery voltage must be between 10 - 18 V.
Engine running.
A/C requested.

Fault criteria:

When output voltage is close to 0 V.

Checking the wiring harness

Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.

Diagnostic help

Diagnosis regards:

Electrical fault in connecting leads or component.

Functions in the diagnostic tool related to the fault:

Activation:
AC Relay

(See also description of readings/activations in diagnostic tool)