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HOMESERVICE MANUALSCADILLAC2011CTS V, 2D COUPE, STANDARDREPAIR AND DIAGNOSISELECTRICALWIRING DIAGRAMSWIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - DOOR HANDLE SWITCH THROUGH FOG LAMPCOMPONENT CONNECTOR END VIEWSENGINE CONTROL MODULE (ECM) X2 (LLT) CONNECTOR END VIEW
2011 Cadillac CTS V, 2D Coupe, Standard

Engine Control Module (ECM) X2 (LLT) Connector End View

2011 Cadillac CTS V, 2D Coupe, StandardSECTION Engine Control Module (ECM) X2 (LLT) Connector End View
Fig 1: Engine Control Module (ECM) X2 (LLT) Connector End View
GM1826273Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X2 (LLT)

Pin Wire Circuit Function
1 0.75 BK/WH 1551 Ground
2 0.75 BK/WH 1551 Ground
3 0.8 PK/BK 5290 Ignition 1 Voltage
4 0.75 BK/WH 1551 Ground
5 0.8 BK/WH 5290 Ignition 1 Voltage
6 0.8 PK/BK 5290 Ignition 1 Voltage
7 0.5 GY/WH 3122 HO2S Heater Low Control - Bank 2 Sensor 1
8 - - Not Used
9 0.5 TN 2759 Low Reference
10 0.5 D-GN/WH 465 Fuel Pump Relay Control - Primary
11 0.5 TN 5514 Low Reference
12 - - Not Used
13 0.5 YE 492 MAF Sensor Signal
14 0.5 GY 2709 5-Volt Reference 1
15 0.5 D-BU 1161 APP Sensor 1 Signal
16 - - Not Used
17 0.5 OG/BK 1786 Ignition Lock Cylinder Control Actuator Signal
18 0.5 L-GN 5007 Backup Lamp Switch Signal (MV7)
19 0.75 WH 1310 EVAP Canister Vent Solenoid Control
20 0.5 OG/WH 3223 HO2S Heater Low Control - Bank 2 Sensor 2
21 0.5 BN/WH 419 MIL Control
22 0.5 TN 2760 Low Reference
23 0.5 TN/WH 3121 HO2S Low Signal - Bank 1 Sensor 2
24 0.5 TN 3221 HO2S Low Signal - Bank 2 Sensor 2
25 0.5 L-BU 1162 APP Sensor 2 Signal
26 0.5 L-BU 1937 Secondary Fuel Level Sensor Signal
27 0.5 D-GN 890 Fuel Tank Pressure Sensor Signal
28-33 - - Not Used
34 0.5 BN 1271 Low Reference
35 0.5 GY 598 5-Volt Reference 3
36 0.5 D-BU 1936 Primary Fuel Level Sensor Signal
37 0.5 L-GN 6338 Manual Transmission Clutch Position Sensor Signal Position (MV7)
38 0.5 PU 3120 HO2S High Signal - Bank 1 Sensor 2
39 0.5 OG/BK 380 A/C Refrigerant Pressure Sensor Signal
40 - - Not Used
41 0.5 D-BU 5985 Accessory Wakeup Serial Data
42 0.5 TN/BK 2500 High Speed GMLAN Serial Data Bus+
43 0.5 PU/WH 821 VSS High Signal (MV7)
44 0.5 D-GN/WH 459 A/C Compressor Clutch Relay Control
45 0.5 D-BU 473 High Speed Cooling Fan Relay Control
46 0.5 D-GN 335 Low Speed Cooling Fan Relay Control
47 0.5 PU 1272 Low Reference
48 0.5 TN 1274 5-Volt Reference 3
49 0.5 WH/BK 1164 5-Volt Reference 2
50 0.5 L-BU 6289 Induction Air Temperature Sensor Signal
51 0.5 PU 3220 HO2S High Signal - Bank 2 Sensor 2
52 0.5 WH 17 Stop Lamp Switch Signal or Stop Lamp Supply Voltage
53 - - Not Used
54 0.5 PK 339 Ignition 1 Voltage
55 0.5 TN 2501 High Speed GMLAN Serial Data Bus-
56 0.5 RD/WH 340 Battery Positive Voltage
57 0.5 YE 447 Starter Relay Coil Control
58 0.5 BN 5069 Main Relay Control
Connector Part Information 
  • Harness Type: Engine
  • OEM Connector: 1928404780
  • Service Connector: 88988935
  • Description: 58-Way F 280 Series, Sealed (BK)
Terminal Part Information 
  • Pins: 1-6
  • Terminated Lead: Pending
  • Release Tool: J-38125-561
  • Diagnostic Test Probe: J-35616-35 (VT)
  • Terminal/Tray: 1928498058/8
  • Core/Insulation Crimp: E/1
  • Pins: 7, 9-11, 13-15, 17-27, 34-39, 41-52, 54-58
  • Terminated Lead: 13578933
  • Release Tool: J-38125-213
  • Diagnostic Test Probe: J-35616-16 (L-GN)
  • Terminal/Tray: 1928498135/19
  • Core/Insulation Crimp: J/J
RENDER: 1.0x

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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.