Renault Nissan Underhood Switching Module

Supported coding features by RenCOM diagnostic tool https://www.obdtester.com/rencom

Underhood Switching Module (UHSM)

What it does

• Controls electrical loads in the engine bay (fans, relays, pumps, etc.)
• Manages power distribution and load protection
• Coordinates signals between engine, body, and safety systems

When it is required

• After UHSM replacement
• After major electrical repairs in the engine bay
• When fault codes or malfunctions occur in controlled circuits
• After software updates affecting UHSM operation

Conditions that must be met

• Vehicle stationary
• Ignition ON (or OFF if specified by diagnostic tool)
• Stable battery voltage
• Diagnostic tool connected
• No unresolved critical fault codes in power distribution circuits

What happens during initialization or coding

• UHSM control unit is recognized by the vehicle network
• Electrical load circuits are tested and synchronized
• Fault codes related to replacement are cleared
• System communicates properly with engine, BCM, and other control units

If initialization or coding is not performed

• Electrical loads may not operate correctly
• Fault codes or warning lights may remain
• Potential safety or drivability issues

After procedure

• Verify operation of all circuits controlled by UHSM
• Check live data for correct load status
• Clear any remaining fault codes
• Perform a short system test to confirm correct operation

Coverage in RenCOM