LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2009 >> Escalade ESV AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 651 (Wiring Systems And Power Management - Component Connector End Views - Electronic Compass Module To Memory Seat Module (X4)) >> Component Connector End Views >> Engine Control Module (ECM) X1 (HP2)
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Engine Control Module (ECM) X1 (HP2)

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
GM784851Courtesy of
Connector Part Information
  • Harness Type: Engine
  • OEM Connector: 13510837
  • Service Connector: 88988373
  • Description: 56-Way F MX123 Series Sealed (BU Encased in BK)
Terminal Part Information
  • Pins: 3, 7, 8, 18-20, 55
  • Terminated Lead: Service by Harness - See Part Catalog
  • Release Tool: J-38125-213
  • Diagnostic Test Probe: J-35616-64B (L-BU)
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
  • Pins: 9, 12, 13, 33-37, 40, 41, 44, 47-49, 54
  • Terminated Lead: Service by Harness - See Part Catalog
  • Release Tool: J-38125-213
  • Diagnostic Test Probe: J-35616-64B (L-BU)
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
Engine Control Module (ECM) X1 (HP2)

Pin Wire Circuit Function
1-2 - - Not Used
3 0.5 PU 5531 Hood Switch Signal
4-6 - - Not Used
7 0.5 L-BU/WH 6311 Brake Pedal Switch Signal
8 0.5 PK/BK 109 Hood Ajar Switch Signal
9 0.35 TN/BK 6049 Low Reference
10-11 - - Not Used
12 0.35 BN/WH 419 Malfunction Indicator Lamp (MIL) Control
13 0.35 D-GN/WH 465 Fuel Pump Control Module Enable
14-17 - - Not Used
18 0.5 D-BU 5985 Serial Data Wake-Up Signal
19 0.5 PK 439 Ignition Voltage
20 0.5 RD/WH 440 Battery Positive Voltage
21-32 - - Not Used
33 0.35 WH/BK 1164 5-Volt Reference 2
34 0.35 GY 2709 5-Volt Reference 1
35 0.35 TN 1274 5-Volt Reference 1
36 0.35 BN 1271 Low Reference
37 0.35 PU 1272 Low Reference
38-39 - - Not Used
40 0.35 YE 5991 Powertrain Relay Coil Control
41 0.35 PU 5128 High Speed Cooling Fan Relay Control
42-43 - - Not Used
44 0.35 PU 1589 Fuel Level Sensor Signal
45-46 - - Not Used
47 0.35 D-BU 1161 Accelerator Pedal Position Sensor 1 Signal
48 0.35 D-GN 890 Fuel Tank Pressure Sensor Signal
49 0.35 L-BU 1162 Accelerator Pedal Position Sensor 2 Signal
50-53 - - Not Used
54 0.35 D-GN 335 Medium Speed Cooling Fan Relay Control
55 0.5 WH 1310 EVAP Canister Vent Solenoid Control
56 - - Not Used
scientia non olet · About LEMON Manuals