C5 Check Relay Box to Control Module Connections

- Remove relay box.

- Inspect Hydraulic Control Unit (HCU) and relay box for moisture or corrosion within assembly.

- Is moisture or corrosion found trapped within assembly?

YES -- Replace anti-lock brake control module. Clear DTCs. Retest system.

NO -- Restore vehicle. Clear DTCs. Retest system, if fault reappears during retest, replace anti-lock brake control module.