EAT ECU Harness Connector C Pin Details EAT ECU Harness Connector C Pin Details Pin No. Description Input/Output 1 Ground for shift interlock solenoid Input 2 Power supply for shift interlock solenoid Output 3 Park signal to steering lock ECU Output 4 to Not used – 9 Range change request 1 Output 10 Range change request Output to Not used – 18 High/Low range switch Input 19 Selector manual Steptronic switch UP Input 20 Selector manual Steptronic switch DOWN Input 21 to Not used – Pin No. Description Input/Output 1 Ignition power supply Input 2 and Not used – 4 Electronic ground – 5 Power ground – 6 Power ground – 7 Permanent battery power supply Input 8 Power supply from main relay Input 9 Power supply from main relay Input
AUTOMATIC TRANSMISSION – GM LE DESCRIPTION AND OPERATION EAT ECU Harness Connector C Pin Details Main Relay The main relay is located inside the E-box and is identified by its blue colour. The relay is connected direct from the battery via a 100 Amp remote fuse, located behind the battery, adjacent to the transfer box ECU. The relay coil is controlled by the ECM which provides aground for the coil when the relay is to be energised. When energised the main relay supplies battery voltage, via fuse 4 in the engine compartment fusebox, to the EAT ECU. Diagnostics The diagnostic socket is located in the fascia, in the driver's side stowage tray. The socket is secured in the fascia panel and protected by a hinged cover.