The lumbar adjustment control I067 (pin 5) is supplied by pin 17 of connector F of the junction unit under the dashboard B002. The line is protected by fuse F52 and controlled by relay T12 with its coil supplied by the ignition-control line excluded during starting (INT/A). Relay T12 is controlled by sending an earth signal supplied by the Body Computer M001.The lumbar adjustment control I067 is earthed at pin 6.The control I067 manages the lumbar adjustment motor N038, from pins 3 and 4, with different polarities depending on the command given.The Body Computer receives a power supply from the battery, via the line protected by fuse F1 located in the engine compartment junction unit B001. It also receives an ignition-controlled power supply (INT) from the ignition switch H001. The reference earth reaches pins 10 and 19 of connector A of M001.