2009 Saturn Vue XR, 3.6 7, AWDFACTORY OEM SERVICE PROCEDURE

Engine Control Module (ECM) X1 (LAT)

Fig 1: Engine Control Module (ECM) X1 (LAT) Connector End View
GM784851Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X1 (LAT)

Pin Wire Circuit Function
1-6 - - Not Used
7 0.5 WH 17 Stop Lamp Switch Signal
8 - - Not Used
9 0.5 BN/WH 6281 Low Reference
10-11 - - Not Used
12 0.5 BN/WH 419 Malfunction Indicator Lamp (MIL) Control
13 0.5 D-GN/WH 465 Fuel Pump Relay Control
14-17 - - Not Used
18 0.5 D-BU 5985 Accessory Wakeup Serial Data
19 0.5 PK 639 Ignition 1 Voltage
20 0.5 RD/WH 40 Battery Positive Voltage
21-25 - - Not Used
26 0.5 PU/WH 6386 Starter Relay Coil Control
27-30 - - Not Used
31 0.5 TN/BK 9945 Low Reference
32 0.5 GY 9905 5-Volt Reference 2
33 0.5 WH/BK 1164 5-Volt Reference 2
34 0.5 BN/WH 6283 5-Volt Reference 1
35 0.5 TN 1274 5-Volt Reference 1
36 0.5 BN 1271 Low Reference
37 0.5 PU 1272 Low Reference
38-39 - - Not Used
40 0.5 YE 5991 Powertrain Relay Control
41-43 - - Not Used
44 0.5 D-BU 1936 Fuel Level Sensor Signal - Left
45 0.5 L-BU 1937 Fuel Level Sensor Signal - Right
46 0.5 YE 9914 Brake Booster Vacuum Sensor Signal
47 0.5 D-BU 1161 APP Sensor 1 Signal
48 0.5 D-GN 890 Fuel Tank Pressure Sensor Signal
49 0.5 L-BU 1162 APP Sensor 2 Signal
50-52 - - Not Used
53 0.5 D-GN/WH 459 A/C Compressor Clutch Relay Control
54 0.5 D-BU 473 High Speed Cooling Fan Relay Control
55 0.5 WH 1310 EVAP Canister Vent Solenoid Control
56 - - Not Used
Connector Part Information 
  • OEM: 34576-0703
  • Service: See Catalog
  • Description: 56-Way F MX123 34576 Series, Sealed (BU)
Terminal Part Information 
  • Pins: 7, 9, 12-13, 18-20, 26, 31-37, 40, 44, 46-49, 53-55
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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