C5 Check Relay Box to Control Module Connections

- Remove relay box.

- Inspect hydraulic control unit and relay box for moisture or corrosion within assembly.

- Is moisture or corrosion found trapped within assembly?

YES -- Replace hydraulic control unit. Clear DTCs. Retest system.

NO -- Restore vehicle. Clear DTCs. Retest system, if fault reappears during retest, Replace hydraulic control unit.