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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 & Terminal Parts Information

Connector Part Information 
  • OEM: 34576-3703
  • Service: See Catalog
  • Description: 56-Way F Micro-Pack 64 Series Sealed (BU)
Terminal Part Information 
  • Pins: 2, 6, 9, 12, 13, 16, 19, 29, 34, 40, 44, 48, 53, 56
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 7, 15, 18, 20, 33, 35-37, 47, 49, 51, 54, 55
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
Engine Control Module (ECM) C1 Terminal Identification

Pin Wire Color Circuit No. Function
1 - - Not Used
2 PU 420 TCC Switch/Cruise Control Release Signal
3-5 - - Not Used
6 BN/WH 379 CPP Switch Signal
7 L-BU 20 Stop Lamp Supply Voltage
8 - - Not Used
9 BK 2759 Low Reference
10-11 - - Not Used
12 BN/WH 419 MIL Control
13 D-GN/WH 465 Fuel Pump Relay Control
14 - - Not Used
15 PU 1807 Class 2 Serial Data
16 PU 1807 Class 2 Serial Data
17 - - Not Used
18 BN 4 Accessory Voltage
19 YE 1139 Ignition 1 Voltage
20 OG 480 Battery Positive Voltage
21-28 - - Not Used
29 GY 1884 Cruise Control Set/Coast and Resume/Accelerate Signal
30-32 - - Not Used
33 WH/BK 1164 5-Volt Reference
34 GY 705 5-Volt Reference
35 PU 1272 5-Volt Reference
36 BN 1271 Low Reference
37 TN 1274 Low Reference
38-39 - - Not Used
40 BN 5069 Powertrain Relay Control
41-43 - - Not Used
44 PU 1589 Fuel Level Sensor Signal
45-46 - - 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 - - Not Used
51 PU 421 Air Solenoid Control (NU6)
52 - - Not Used
53 D-GN/WH 459 A/C Compressor Clutch Relay Control (C60)
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 & Terminal Parts Information

Connector Part Information 
  • OEM: 34576-3003
  • Service: See Catalog
  • Description: 56-Way F Micro-Pack 64 Series Sealed (BU)
Terminal Part Information 
  • Pins: 2, 6, 9, 12, 13, 16, 19, 29, 34, 40, 44, 48, 53, 56
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 7, 15, 18, 20, 33, 35-37, 47, 49, 54, 55
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
Engine Control Module (ECM) C1 Terminal Identification

Pin Wire Color Circuit No. Function
1 - - Not Used
2 PU 420 TCC Switch/Cruise Control Release Signal
3-5 - - Not Used
6 BN/WH 379 CPP Switch Signal
7 L-BU 20 Stop Lamp Supply Voltage
8 - - Not Used
9 BK 2759 Low Reference
10-11 - - Not Used
12 BN/WH 419 MIL Control
13 D-GN/WH 465 Fuel Pump Relay Control
14 - - Not Used
15 PU 1807 Class 2 Serial Data
16 PU 1807 Class 2 Serial Data
17 - - Not Used
18 BN 4 Accessory Voltage
19 YE 1139 Ignition 1 Voltage
20 OG 480 Battery Positive Voltage
21-28 - - Not Used
29 GY 1884 Cruise Control Set/Coast and Resume/Accelerate Signal
30-32 - - Not Used
33 WH/BK 1164 5-Volt Reference
34 GY 705 5-Volt Reference
35 PU 1272 5-Volt Reference
36 BN 1271 Low Reference
37 TN 1274 Low Reference
38-39 - - Not Used
40 BN 5069 Powertrain Relay Control
41-43 - - Not Used
44 PU 1589 Fuel Level Sensor Signal
45-46 - - 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 (C60)
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
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