A559

What the Code Means

Code A559 logs an interruption in power to the instrument cluster. The cluster gets its power through the FRM (Footwell Module), and a cut can be either a protective measure by the module or the result of an internal FRM failure. Another likely cause is faulty wiring or bad connections in the power supply circuit.

Normally the instrument cluster receives stabilized power at all times. Without it, the gauge readings, warning lamps, and bus communication with the other modules all drop out.

Symptoms

• The instrument cluster goes dark completely or works intermittently;
• gauge readings disappear;
• warning lamps and indicator lights may fail to come on.

Diagnosis and Repair

1. Connect ISTA and check the instrument cluster power circuits.
2. Inspect the FRM and the cluster connectors: contacts and the condition of the connections.
3. Check battery voltage and the integrity of the ground connections.
4. If an FRM fault is confirmed, repair it (rebuild the module).

A common diagnostic mistake is replacing the instrument cluster without checking the FRM and the power circuits, when the source of the problem is more often in the module or the wiring.

Related Problems

• When power is lost, the instrument cluster can fail completely and need replacement;
• other modules can lose bus communication, which leads to multiple system failures across the car.

Don't put off diagnosis: a power fault affects not only the instrument panel but also the data exchange between modules.