2005 Cadillac STS 3.6 7FACTORY OEM SERVICE PROCEDURE

Engine Control Module (ECM) Connector End Views

Engine Control Module (ECM) C1 Connector End View

GM1331455Courtesy of GENERAL MOTORS CORP.
Connector Part Information
  • OEM: 1928403513
  • Service:
  • 64-Way F Unknown (BK)
Terminal Part Information
  • Terminal:
  • Terminal Seal:
  • Release Tool:
  • Core Crimp:
  • Insulation Crimp:
  • Test Probe:
Pin Wire Color Circuit No. Function
1 TN 407 KS Low Reference Bank 2
2 OG 5278 Heated Oxygen Sensor Input Pump Current Bank 1 Sensor (1)
3 L-GN 5280 Heated Oxygen Sensor Input Pump Current Bank 2 Sensor (1)
4 OG 5275 Camshaft Position Intake Sensor (1)
5 GY 605 Reference Voltage Feed - 5-Volt Reference
6 YE 7017 Variable Intake Manifold Position Signal
7 TN 470 Low Reference
8 PU 486 Throttle Position Sensor Signal 2
9 D-GN/WH 2124 Electronic Spark Timing Signal Cylinder 4
10 WH/BK 5039 Engine Speed Sensor High
11 - - Not Used
12 OG/BK 5272 Camshaft Phaser Intake Solenoid (2)
13 L-GN 5282 Camshaft Phaser Exhaust Solenoid (1)
14 - - Not Used
15 BN 582 Throttle Motor Feed - Close
16 GY/WH 5037 Heated Oxygen Sensor Heater High Control Bank 2 Sensor (2)
17 GY 1716 Knock Sensor Return
18 TN 1653 Oxygen Sensor Return - Left - Forward of Catalytic Converter
19 PU/WH 1666 Oxygen Sensor Signal - Right - Forward of Catalytic Converter
20 D-GN 5273 Camshaft Position Exhaust Sensor (1)
21 GY 23 Alternator Field Duty Cycle Signal
22 - - Not Used
23 YE 410 Coolant Temperature Sensor Signal
24 - - Not Used
25 L-BU/WH 2126 Electronic Spark Timing Signal Cylinder 6
26 OG/WH 2122 Electronic Spark Timing Signal Cylinder 2
27-28 - - Not Used
29 PU 5284 Camshaft Phaser Intake Solenoid (1)
30 WH/BK 5283 Camshaft Phaser Exhaust Solenoid (2)
31 YE 581 Throttle Motor Feed - Open
32 L-GN 5038 Heated Oxygen Sensor Heater High Control Bank 1 Sensor (3)
33 D-BU 496 Knock Sensor Signal 1
34 PU 1665 Oxygen Sensor Signal - Left - Forward of Catalytic Converter
35 WH 5281 Heated Oxygen Sensor Pump Current Bank 2 Sensor (1)
36 PU 5274 Camshaft Position Exhaust Sensor (2)
37 BN 1174 Oil Level Sensor Signal
38 D-GN/WH 357 Oil Temperature Sensor Signal
39 TN 2752 Sensor Return - Throttle Position Sensor
40 TN/BK 231 Oil Pressure Switch Signal
41 D-GN 2125 Electronic Spark Timing Signal Cylinder 5
42 PU 2121 Electronic Spark Timing Signal Cylinder 1
43 OG 225 Alternator Output - Regulator Reference Voltage
44 L-BU/BK 5041 Intake Manifold Control (1)
45 L-BU/BK 844 Fuel Injector 4 Output
46 PK/BK 1746 Fuel Injector 3 Output
47 TN/WH 845 Fuel Injector 5 Output
48 L-GN/WH 428 Canister Purge Solenoid Output
49 GY/BK 1798 Return
50 L-BU 1876 Knock Sensor Signal 2
51 PU/WH 5279 Heated Oxygen Sensor Pump Current Bank 1 Sensor (1)
52 TN 1667 Oxygen Sensor Return - Right - Forward of Catalytic Converter
53 YE 5276 Camshaft Position Intake Sensor (2)
54 GY 2701 Reference Voltage Feed - 5-Volt Ref - Throttle Position Sensor
55 D-GN 485 Throttle Position Sensor Signal 1
56 OG/BK 5266 Baro Sensor Signal
57 GY 705 Reference Voltage Feed - 5-Volt Reference
58 L-BU 2123 Electronic Spark Timing Signal Cylinder 3
59 PU/WH 5024 Engine Speed Sensor Low
60-61 - - Not Used
62 L-GN/BK 1745 Fuel Injector 2 Output
63 TN 1744 Fuel Injector 1 Output
64 YE/BK 846 Fuel Injector 6 Output
Engine Control Module (ECM) C2 Connector End View

GM1331454Courtesy of GENERAL MOTORS CORP.
Connector Part Information
  • OEM: 1928403386
  • Service:
  • 64-Way F Unknown (BK)
Terminal Part Information
  • Terminal:
  • Terminal Seal:
  • Release Tool:
  • Core Crimp:
  • Insulation Crimp:
  • Test Probe:
Pin Wire Color Circuit No. Function
1 PK/BK 5290 Engine Main Relay Fused Control (1)
2 BK/WH 3122 Oxygen Sensor Heater Control Low - Front
3 PK 239 Run/Crank Ignition 1 Voltage
4 D-BU 473 High Speed Cooling Fan Relay Control
5-6 - - Not Used
7 WH/BK 1164 Electronic Throttle - Pedal Position 5-Volt Ref 1
8 PU 1272 Electronic Throttle - Pedal Position 2
9 RD/BK 380 Air Conditioning Refrigerant Pressure Sensor Signal
10 WH 17 Stop Lamp Switch Signal
11 TN 472 Manifold Absolute Temperature Sensor Signal
12 D-GN 890 Fuel Tank Pressure Sensor Signal
13-16 - - Not Used
17 PK/BK 5290 Engine Main Relay Fused Control (1)
18 RD/WH 3223 Oxygen Sensor Signal - Bank 2 Sensor 2 Heater Control Low
19 D-GN/WH 465 Fuel Pump Primary Relay Control
20 D-GN 335 Low Speed Cooling Fan Relay Control
21 - - Not Used
22 BN 818 Vehicle Speed Signal
23 TN/BK 2500 High Speed GMLAN Serial Data (+) (1)
24 BN 5069 Engine Main Relay Coil Control
25 BK 452 Sensor Return
26 BK 2760 Sensor Return - Induction Air Temperature
27 L-BU 1937 Fuel Gage Sensor Signal - Right
28 - - Not Used
29 PU/WH 1668 Heated Oxygen Sensor High Signal Bank 1 Sensor (2)
30-31 - - Not Used
32 OG/BK 1786 Transmission Park/Neutral Signal
33 WH 1310 Canister Vent Valve Solenoid Output
34 - - Not Used
35 YE 447 Starter Relay Coil Control
36 RD/WH 1440 Battery Positive Voltage
37-38 - - Not Used
39 GY 596 Reference Voltage Feed - 5-Volt Reference
40 BN 1271 Electronic Throttle - Pedal Position Return 1
41 TN 1671 Heated Oxygen Sensor Low Signal Bank 2 Sensor (2)
42 D-BU 1936 Fuel Gage Sensor Signal - Left
43 YE 492 Mass Air Flow Signal
44 L-BU 1162 Electronic Throttle - Pedal Position Signal 2
45-48 - - Not Used
49 D-GN/WH 459 A/C Compressor Clutch Relay Control
50 BN/WH 419 Check Engine Indicator Lamp Output
51-54 - - Not Used
55 TN 2501 High Speed GMLAN Serial Data (-) (1)
56 TN 1274 Electronic Throttle - Pedal Position 5-Volt Ref 2
57 TN/WH 1669 Oxygen Sensor Return - Left - Rear of Catalytic Converter
58 YE/BK 5728 ECM/TCM Serial Data Wake Up
59 - - Not Used
60 D-BU 1161 Electronic Throttle - Pedal Position Signal 1
61 PU 1670 Heated Oxygen Sensor High Signal Bank 2 Sensor (2)
62-64 - - Not Used
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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.