2007 Saturn Ion Red LineFACTORY OEM SERVICE PROCEDURE

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
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.