LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2007 >> STS Base, 4.6 A, RWD >> Repair and Diagnosis >> Electrical >> Wiring Diagrams >> OEM Connector End Views - Antilock Brake System, Remote Function, Steering Wheel And Column, Engine Control Module, Engine Controls, Entertainment/Communication >> Engine Control Module Connector End Views >> Engine Control Module (ECM) Connector End View C1
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Engine Control Module (ECM) Connector End View C1

Fig 1: Engine Control Module (ECM) C1 Connector End View
GM1228485Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) C1 Connector Parts Information

Connector Part Information 
  • OEM: 34576-3103
  • Service: 88988373
  • Description: 56-Way F (BU)
Terminal Part Information 
  • Pins: 7, 18, 34, 39, 40, 44, 45, 53, 54, 56
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 9, 12, 13, 20, 33, 35, 36, 37, 46, 47, 48, 49, 19, 55
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: Pins 9, 12, 13, 20, 33, 35, 36, 37, 46, 47, 48, 49 - J/J
  • Core/Insulation Crimp: Pins 19, 55 - K/K
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
Engine Control Module (ECM) C1 Connector End View

Pin Wire Color Circuit No. Function
1-6 - - Not Used
7 WH 17 Stop Lamp Switch Signal
8 - - Not Used
9 TN 2759 Low Reference
10-11 - - Not Used
12 BN/WH 419 MIL Control
13 D-GN/WH 465 Fuel Pump Relay Control (Primary)
14-17 - - Not Used
18 YE/BK 5728 ECM/TCM Serial Data Wake Up
19 PK 239 Run/Crank Ignition 1 Voltage
20 RD/WH 1440 Battery Positive Voltage
21-32 - - Not Used
33 WH/BK 1164 Accelerator Pedal Position 5-Volt Reference (1)
34 GY 2709 5-Volt Reference
35 TN 1274 5-Volt Reference
36 BN 1271 Low Reference
37 PU 1272 Low Reference
38 - - Not Used
39 BN 818 Vehicle Speed Signal
40 BN 5069 Powertrain Relay Control
41-43 - - Not Used
44 D-BU 1936 Fuel Level Sensor Signal (Secondary)
45 L-BU 1937 Secondary Fuel Level Sensor Signal
46 BN 7123 Super Charger Inlet Air Pressure Sensor Signal
47 D-BU 1161 APP Sensor 1 Signal
48 D-GN 890 Fuel Tank Pressure Sensor Signal
49 L-BU 1162 APP Sensor 2 Signal
50-52 - - Not Used
53 D-GN/WH 459 A/C Compressor Clutch Relay Control
54 D-BU 473 High Speed Cooling Fan Relay Control
55 WH 1310 EVAP Canister Vent Solenoid Control
56 YE 447 Starter Relay Coil Control


Fig 1: Engine Control Module (ECM) C1 Connector End View
GM1228485Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) C1 Connector Parts Information

Connector Part Information 
  • OEM: 34576-0703
  • Service: 88988373
  • Description: 56-Way F (BU)
Terminal Part Information 
  • Pins: 7, 18, 34, 39, 40, 44, 45, 53, 54, 56
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 9, 12, 13, 20, 33, 35, 36, 37, 46, 47, 48, 49, 19, 55
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: Pins 9, 12, 13, 20, 33, 35, 36, 37, 46, 47, 48, 49 - J/J
  • Core/Insulation Crimp: Pins 19, 55 - K/K
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
Engine Control Module (ECM) C1 Connector End View

Pin Wire Color Circuit No. Function
1-6 - - Not Used
7 WH 17 Stop Lamp Switch Signal
8 - - Not Used
9 TN 2759 Low Reference
10-11 - - Not Used
12 BN/WH 419 MIL Control
13 D-GN/WH 465 Fuel Pump Relay Control (Primary)
14-17 - - Not Used
18 YE/BK 5728 ECM/TCM Serial Data Wake Up
19 PK 239 Run/Crank Ignition 1 Voltage
20 RD/WH 1440 Battery Positive Voltage
21-32 - - Not Used
33 WH/BK 1164 Accelerator Pedal Position 5-Volt Reference (1)
34 GY 2709 5-Volt Reference
35 TN 1274 5-Volt Reference
36 BN 1271 Low Reference
37 PU 1272 Low Reference
38 - - Not Used
39 BN 818 Vehicle Speed Signal
40 BN 5069 Powertrain Relay Control
41-43 - - Not Used
44 D-BU 1936 Fuel Level Sensor Signal (Secondary)
45 L-BU 1937 Secondary Fuel Level Sensor Signal
46 - - Not Used
47 D-BU 1161 APP Sensor 1 Signal
48 D-GN 890 Fuel Tank Pressure Sensor Signal
49 L-BU 1162 APP Sensor 2 Signal
50-52 - - Not Used
53 D-GN/WH 459 A/C Compressor Clutch Relay Control
54 D-BU 473 High Speed Cooling Fan Relay Control
55 WH 1310 EVAP Canister Vent Solenoid Control
56 YE 447 Starter Relay Coil Control
scientia non olet · About LEMON Manuals