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Home >> Land Rover >> 2022 >> Defender 90 S >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Electronic Engine Controls - V8 S/C 5.0L Petrol -- Defender/L663) >> Electronic Engine Controls - V8 S/C 5.0L Petrol (G2796672) >> Description And Operation >> Electronic Engine Controls - V8 S/C 5.0L Petrol (G2796673) >> Operation >> Powertrain Control Module Relay

Powertrain Control Module Relay

WARNING: This page is about a different variant/trim than selected.

The PCM  relay is used to initiate the power up and power down routines within the PCM  . The PCM  relay is located in the Engine Junction Box (EJB).

When the vehicle is in Power Mode 6 (ignition ON), the Body Control Module (BCM)/Gateway Control Module (GWM) applies startup battery voltage to the ignition sense input. The PCM  then starts power up routines and energizes the PCM  relay.

When the vehicle is in Power Mode 4 (accessory (vehicle unlocked and Smart Key present)) or lower, the PCM  maintains its powered up state while it conducts the power down routines. This can be for:

On completion of the power down routines the PCM  deactivated the PCM  relay.

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