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HOMESERVICE MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 417 (COMPONENT LOCATIONS & COMPONENT CONNECTOR END VIEWS)COMPONENT CONNECTOR END VIEWSENGINE CONTROL MODULE (ECM) X1 (LS4)
2008 Pontiac Grand Prix Base

Engine Control Module (ECM) X1 (LS4)

2008 Pontiac Grand Prix BaseSECTION Engine Control Module (ECM) X1 (LS4)
WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Engine Control Module (ECM) X1 (LS4) Connector End View
GM1673474Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X1 (LS4)

Pin Wire Circuit Function
1-6 - - Not Used
7 0.5 WH 17 Stop Lamp Switch Signal
8 - - Not Used
9 0.35 BK 2759 Low Reference
10-11 - - Not Used
12 0.35 BN/WH 419 MIL Control
13 0.35 D-GN/WH 465 Fuel Pump Relay Control
14-15 - - Not Used
16 0.35 D-GN 1049 ECM Class 2 Serial Data
17 - - Not Used
18 0.35 BN 1141 Accessory Voltage
19 0.5 PK 439 Ignition 1 Voltage
20 0.5 OG 540 Battery Positive Voltage
21-24 - - Not Used
25 0.35 WH 121 Engine Speed Signal
26-28 - - Not Used
29 0.5 GY 1884 Cruise Control Switch Signal
30-31 - - Not Used
32 0.35 GY 6031 5-Volt Reference 2
33 0.35 WH/BK 1164 5-Volt Reference 1
34 0.35 GY 2709 5-Volt Reference 1
35 0.35 TN 1274 5-Volt Reference 2
36 0.35 BN 1271 Low Reference
37 0.35 PU 1272 Low Reference
38 - - Not Used
39 0.35 D-GN 389 Vehicle Speed Signal
40 0.35 BN 5069 Powertrain Relay Control
41-43 - - Not Used
44 0.35 PU 1589 Fuel Level Sensor Signal
45 - - Not Used
46 0.35 OG 6030 Brake Booster Vacuum Signal
47 0.35 D-BU 1161 APP Sensor 2 Signal
48 0.35 D-GN 890 Fuel Tank Pressure Sensor Signal
49 0.35 L-BU 1162 APP Sensor 1 Signal
50-52 - - Not Used
53 0.35 D-GN/WH 459 A/C Compressor Clutch Relay Control
54 0.35 D-BU 473 High Speed Cooling Fan Relay Control
55 0.35 WH 1310 EVAP Canister Vent Solenoid Control
56 0.35 YE/BK 625 Starter Enable Relay Control
Connector Part Information 
  • OEM: 13583475
  • Service: See Catalog
  • Description: 56-Way F MX123 Series (BK)
Terminal Part Information 
  • Pins: 7, 9, 12, 16, 18-20, 25, 29, 31-37, 39, 40, 44, 46-49, 53-56
  • Terminal/Tray: See Terminal Repair Kit
  • Core/Insulation Crimp: See Terminal Repair Kit
  • Release Tool/Test Probe: See Terminal Repair Kit
RENDER: 1.0x

NO RELATED

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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.