11/1/2019 Document ID: 1608928

2006 Chevrolet TrailBlazer - 2WD | Envoy, Rainier, TrailBlazer, Ascender VIN S/T Service Manual | Engine | Engine Controls - 6.0L | Component Locator |
Document ID: 1608928

Engine Control Module Connector End Views

Table 1: Engine Control Module (ECM) C1
Table 2: Engine Control Module (ECM) C2
Table 3: Engine Control Module (ECM) C3

Engine Control Module (ECM) C1

Connector Part Information

OEM: 15491996
Service: 88953346
Description: 37-Way F Micro-Pack 64 Series Sealed (BU)

Terminal Part Information

Pins: 1, 2, 4, 7, 8, 10, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 29, 30, 31, 32, 33, 35, 36, 37, 41, 45, 46,
48, 49, 51, 52, 54, 55
Terminal/Tray: 15359541/4
Core/Insulation Crimp: M/M
Release Tool/Test Probe: 15381651-2/J-35616-64B
© 2019 General(L-BU)
Motors. All rights reserved.

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11/1/2019 Document ID: 1608928

Engine Control Module (ECM) C1

Pin Wire Color Circuit No. Function

1 TN/WH 2500 High Speed GMLAN Serial Data Bus (+)

2 TN 2501 High Speed GMLAN Serial Data Bus (−)

3 — — Not Available

4 BN/WH 419 MIL Control

5–6 — — Not Available

7 BN 1271 Low Reference

8 PU 1272 Low Reference

9 — — Not Available

10 YE 5991 Powertrain Relay Coil Control

11–12 — — Not Available

13 YE/BK 625 Starter Enable Relay Control

14 PK 839 Ignition 1 Voltage

15 YE 710 Class 2 Serial Data

16 D-GN 1049 Class 2 Serial Data

17 GY 397 Cruise Control On Switch Signal (K34)

18 PK 1020 Ignition 0 Voltage

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11/1/2019 Document ID: 1608928

Pin Wire Color Circuit No. Function

19 PK 439 Ignition 1 Voltage

20 OG 240 Battery Positive Voltage

21 D-GN/WH 817 Vehicle Speed Signal

22 D-BU 1161 APP Sensor 1 Signal

23 D-BU 2364 Cooling Fan Speed Signal

24 D-GN 890 Fuel Tank Pressure Sensor Signal

25 — — Not Available

26 RD/BK 380 A/C Refrigerant Pressure Sensor Signal

27 D-BU 84 Cruise Control Set/Coast Switch Signal (K34)

28 — — Not Available

29 TN 1274 5-Volt Reference

30 GY 2700 5-Volt Reference

31 GY 2709 5-Volt Reference

32 L-BU 1320 CHMSL Supply Voltage (K34)

33 GY/BK 87 Cruise Control Resume/Accel Switch Signal (K34)

34 — — Not Available

35 WH/BK 1164 5-Volt Reference

36 WH/BK 2366 Cooling Fan Clutch Control

© 2019 General Motors. All rights reserved.

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11/1/2019 Document ID: 1608928

Pin Wire Color Circuit No. Function

37 PU 1589 Fuel Level Sensor Signal

38–40 — — Not Available

41 L-BU 1162 APP Sensor 2 Signal

42–44 — — Not Available

45 D-GN/WH 465 Fuel Pump Relay Control

46 PU 420 TCC Brake Switch/Cruise Control Release Signal

47 — — Not Available

48 WH 121 Engine Speed Signal

49 YE/BK 1827 Vehicle Speed Signal

50 — — Not Available

51 OG/BK 1786 Ignition Lock Cylinder Control Actuator Signal

52 PU 806 Crank Voltage

53 — — Not Available

54 WH 1310 EVAP Canister Vent Solenoid Control

55 BK 2751 Low Reference

56 — — Not Available

Engine Control Module (ECM) C2

© 2019 General Motors. All rights reserved.

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11/1/2019 Document ID: 1608928

72

53

33 52

17 73
32
1 16

Connector Part Information

OEM: 15481009
Service: 88953274
Description: 56-Way F GT 280 Micro 64 Series Sealed (BK)

Terminal Part Information

Pins: 1, 2, 4, 5, 6, 7, 8, 9, 10, 13, 14, 15, 16, 20, 21, 24, 26, 29, 31, 35, 36, 37, 41, 43, 44, 45, 46, 48, 49, 50, 51, 52,
53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 68, 69, 70, 71, 72
Terminal/Tray: 15359541/4
Core/Insulation Crimp: M/M
Release Tool/Test Probe: 15381651-2/J-35616-64B (L-BU)

Pins: 73
Terminal/Tray: 15304720/19
Core/Insulation Crimp: 4/5
Release Tool/Test Probe: 15315247/J-35616-4A (PU)

Engine Control Module (ECM) C2

Pin Wire Color Circuit No. Function

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11/1/2019 Document ID: 1608928

Pin Wire Color Circuit No. Function

1 L-GN 3212 HO2S Heater Low Control – Bank 2 Sensor 1

2 BK/WH 3113 HO2S Heater Low Control – Bank 1 Sensor 1

3 — — Not Available

4 D-BU/WH 878 Fuel Injector 8 Control

5 BK 1744 Fuel Injector 1 Control

6 L-GN/BK 1745 Fuel Injector 2 Control

7 RD/BK 877 Fuel Injector 7 Control

8 L-BU/BK 844 Fuel Injector 4 Control

9 PK/BK 1746 Fuel Injector 3 Control

10 BK/WH 845 Fuel Injector 5 Control

11–12 — — Not Available

13 YE/BK 846 Fuel Injector 6 Control

14 YE/BK 1868 Low Reference

15 PK/BK 632 Low Reference

16 BN 2129 Low Reference

17–18 — — Not Used

19 — — Not Available

20 OG/BK 469 Low Reference

© 2019 General Motors. All rights reserved.

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11/1/2019 Document ID: 1608928

Pin Wire Color Circuit No. Function

21 BK 2755 Low Reference

22–23 — — Not Available

24 TN/WH 332 Oil Pressure Sensor Signal

25 — — Not Available

26 BN/WH 633 CMP Sensor Signal

27–28 — — Not Available

29 PU 486 TP Sensor 2 Signal

30 — — Not Available

31 D-GN 485 TP Sensor 1 Signal

32 — — Not Available

33–34 — — Not Used

35 GY 2704 5-Volt Reference

36 BK/WH 1704 Low Reference

37 GY 2705 5-Volt Reference

38–40 — — Not Available

41 L-BU/BK 1688 5-Volt Reference

42 — — Not Available

43 L-GN 1867 12-Volt Reference

© 2019 General Motors. All rights reserved.

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11/1/2019 Document ID: 1608928

Pin Wire Color Circuit No. Function

44 RD 631 12-Volt Reference

45 GY 23 Generator Field Duty Cycle Signal

46 L-GN 432 MAP Sensor Signal

47 — — Not Available

48 PU/WH 1665 HO2S High Signal – Bank 1 Sensor 1

49 TN 1664 HO2S Low Signal – Bank 1 Sensor 1

50 D-GN/WH 428 EVAP Canister Purge Solenoid Control

51 PU 1666 HO2S High Signal – Bank 2 Sensor 1

52 BK 2761 Low Reference

53 RD 2127 IC 7 Control

54 PU 2121 IC 1 Control

55 YE 410 ECT Sensor Signal

56 RD 225 Generator Turn On Signal

57 L-BU/WH 2126 IC 6 Control

58 D-GN/WH 2124 IC 4 Control

59 D-GN 2125 IC 5 Control

60 BN 582 TAC Motor Control – 2

61 L-BU 2123 IC 3 Control

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11/1/2019 Document ID: 1608928

Pin Wire Color Circuit No. Function

62 D-BU/WH 1869 CKP Sensor Signal

63 YE 581 TAC Motor Control – 1

64 BN/WH 2130 Low Reference

65 PU/WH 2128 IC 8 Control

66 RD/WH 2122 IC 2 Control

67 — — Not Available

68 D-BU 496 KS 1 Signal

69 GY 1716 KS 1 Signal

70 TN 1667 HO2S Low Signal – Bank 2 Sensor 1

71 GY 2303 KS 2 Signal

72 L-BU 1876 KS 2 Signal

73 BK 450 Ground

Engine Control Module (ECM) C3

© 2019 General Motors. All rights reserved.

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11/1/2019 Document ID: 1608928

Connector Part Information

OEM: 15481007
Service: 88953347
Description: 20-Way F Micro-Pack 64 Series Sealed (GY)

Terminal Part Information

Pins: 2, 3, 11, 18, 19, 20, 21, 24, 29, 33, 34, 35, 38, 45, 47, 49, 51
Terminal/Tray: 15359541/4
Core/Insulation Crimp: M/M
Release Tool/Test Probe: 15381651-2/J-35616-64B (L-BU)

Engine Control Module (ECM) C3

Pin Wire Color Circuit No. Function

1 — — Not Available

2 BN 2391 HO2S Heater Low Control – Bank 1 Sensor 2

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11/1/2019 Document ID: 1608928

Pin Wire Color Circuit No. Function

3 RD/WH 3223 HO2S Heater Low Control – Bank 2 Sensor 2

4–5 — — Not Available

6 — — Not Used

7–10 — — Not Available

11 YE 492 MAF Sensor Signal

12–14 — — Not Available

15 — — Not Used

16–17 — — Not Available

18 TN/WH 1669 HO2S Low Signal – Bank 1 Sensor 2

19 PU/WH 1668 HO2S High Signal – Bank 1 Sensor 2

20 PU 1670 HO2S High Signal – Bank 2 Sensor 2

21 TN 1671 HO2S Low Signal – Bank 2 Sensor 2

22–23 — — Not Available

24 BK 2760 Low Reference

25–28 — — Not Available

29 GY/BK 1694 4WD Low Signal

30–32 — — Not Available

33 GY 2365 Low Reference

© 2019 General Motors. All rights reserved.

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11/1/2019 Document ID: 1608928

Pin Wire Color Circuit No. Function

34 TN 472 IAT Sensor Signal

35 GY 597 5-Volt Reference

36 — — Not Used

37 — — Not Available

38 TN/BK 464 Delivered Torque Signal

39–44 — — Not Available

45 YE 400 Signal High – Front

46 — — Not Available

47 OG/BK 463 Requested Torque Signal

48 — — Not Available

49 BK 2759 Low Reference

50 — — Not Available

51 D-GN/WH 459 A/C Compressor Clutch Relay Control

52–56 — — Not Available

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