Engine Control Module Connector End Views. Cadillac STS 2007

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2007 🢒 STS 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Engine Control Module Connector End Views

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

Engine Control Module (ECM) C1

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

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

Engine Control Module (ECM) C2

Connector Part Information

OEM: 34566-0103
Service: 88988931
Description: 73-Way F (BK)

Terminal Part Information

Pins: 73
Terminal/Tray: 7116-4152-02/9
Core/Insulation Crimp: 2/5
Release Tool/Test Probe: 12094430/J-35616-35 (VT)

Pins: 13, 28, 45, 65
Terminal/Tray: 33467-0003/23
Core/Insulation Crimp: H/H
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Pins: 1, 2, 3, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 62, 63, 64, 66, 67, 68, 69, 70, 71, 72, 11, 12
Terminal/Tray: 33467-0005/23
Core/Insulation Crimp: Pins 1, 2, 3, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 62, 63, 64, 66, 67, 68, 69, 70, 71, 72 - J/J
Core/Insulation Crimp: Pins 11, 12 - K/K
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Engine Control Module (ECM) C2

Pin	Wire Color	Circuit No.	Function
1	PU	2121	IC 1 Control
2	TN/WH	3111	HO2S Low Reference (Bank 1 Sensor 1)
3	PU/WH	3110	HO2S Reference Voltage (Bank 1 Sensor 1)
4	PU	3120	HO2S Reference Voltage (Bank 1 Sensor 2)
5	TN/WH	3121	HO2S Low Reference (Bank 1 Sensor 2)
6	L-BU	1876	Knock Sensor 2 Signal
7	GY	2303	Knock Sensor 2 Signal
8	D-BU	496	Knock Sensor 1 Signal
9	GY	1716	Knock Sensor 1 Signal
10	--	--	Not Used
11	YE	581	TAC Motor Control - 1
12	BN	582	TAC Motor Control - 2
13	PK/BK	5290	Ignition 1 Voltage
14	PK/BK	6395	Camshaft Position (CMP) Actuator Solenoid - Intake Bank 1 Control
15	TN/BK	6397	Camshaft Position (CMP) Actuator Solenoid - Intake Bank 2 Control
16	D-BU/WH	878	Fuel Injector 8 Control
17	OG/WH	2122	IC 2 Control
18	L-BU/WH	2126	IC 6 Control
19	BN/WH	2130	Low Reference
20	PU	6267	Low Reference
21	TN	6268	Low Reference
22	WH	6269	Low Reference
23	BN	6266	Low Reference
24	BK	2755	Low Reference
25-26	--	--	Not Used
27	GY/BK	6272	Low Reference
28	PK/BK	5290	Ignition 1 Voltage
29	TN	2752	Low Reference
30	BN/WH	6754	Low Reference
31	D-BU/WH	6756	Low Reference
32	L-BU/BK	1746	Fuel Injector 3 Control
33	OG	2127	IC 7 Control
34	D-GN	2125	IC 5 Control
35	BN	2129	Low Reference
36	D-GN	6457	5-Volt Reference
37	OG	6260	5-Volt Reference
38	PK	6261	5-Volt Reference
39	D-BU	6259	5-Volt Reference
40	GY	2705	5-Volt Reference
41	--	--	Not Used
42	TN	2760	Low Reference
43	PU/WH	6270	5-Volt Reference
44	GY	2701	5-Volt Reference
45	--	--	Not Used
46	BN	6753	Low Reference
47	D-BU	6755	Low Reference
48	L-GN/BK	1745	Fuel Injector 2 Control
49	TN/WH	845	Fuel Injector 5 Control
50	WH/BK	6396	Camshaft Position (CMP) Actuator Solenoid - Exhaust Bank 1 Control
51	GY/BK	6394	Camshaft Position (CMP) Actuator Solenoid - Exhaust Bank 2 Control
52	L-BU/BK	844	Fuel Injector 4 Control
53	L-BU	2123	IC 3 Control
54	D-GN/WH	2124	IC 4 Control
55	PU/WH	2128	IC 5 Control
56	D-GN/WH	6264	Camshaft Position (CMP) Sensor - Exhaust Bank 1 Signal
57	OG/BK	6263	Camshaft Position (CMP) Sensor - Intake Bank 2 Signal
58	PK/BK	6262	Camshaft Position (CMP) Sensor - Exhaust Bank 2 Signal
59	D-BU/WH	6265	Camshaft Position (CMP) Sensor - Intake Bank 1 Signal
60	TN/WH	331	Oil Pressure Sensor Signal
61	--	--	Not Used
62	TN	472	IAT Sensor Signal
63	WH/BK	6271	CKP Sensor Signal
64	D-GN	485	TP Sensor 1 Signal
65	--	--	Not Used
66	PU	486	TP Sensor 2 Signal
67	YE	492	MAF Sensor Signal
68	GY/WH	3113	HO2S Heater Low Control (Bank 1 Sensor 1)
69	GY/WH	3122	HO2S Heater Low Control (Bank 2 Sensor 1)
70	YE/BK	846	Fuel Injector 6 Control
71	OG/BK	877	Fuel Injector 7 Control
72	TN	1744	Fuel Injector 1Control
73	BK/WH	1551	Ground

Engine Control Module (ECM) C3

Connector Part Information

OEM: 34566-0203
Service: 88988372
Description: 73-Way F (GY)

Terminal Part Information

Pins: 73
Terminal/Tray: 7116-4152-02/9
Core/Insulation Crimp: 2/5
Release Tool/Test Probe: 12094430/J-35616-35 (VT)

Pins: 3, 4, 5, 6, 7, 14, 15, 16, 18, 21, 22, 23, 29, 33, 34, 35, 37, 38, 39, 46, 50, 53, 55, 56, 57, 58, 59
Terminal/Tray: 33467-0005/23
Core/Insulation Crimp: J/J
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Pins: 48, 49
Terminal/Tray: 33467-0003/23
Core/Insulation Crimp: H/H
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Engine Control Module (ECM) C3

Pin	Wire Color	Circuit No.	Function
1-2	--	--	Not Used
3	TN/WH	3211	HO2S Low Reference (Bank 2 Sensor 1)
4	PU/WH	3210	HO2S Reference Voltage (Bank 2 Sensor 1)
5	PU	3220	HO2S Reference Voltage (Bank 2 Sensor 2)
6	TN	3221	HO2S Low Reference (Bank 2 Sensor 2)
7	OG	225	Generator Turn On Signal
8-14	--	--	Not Used
15	L-GN	3212	HO2S Heater Low Control (Bank 2 Sensor 1)
16-17	--	--	Not Used
18	BN	1174	Oil Level Switch Signal (RHD)
19-20	--	--	Not Used
21	BK/WH	2751	Low Reference
22	--	--	Not Used
23	OG/BK	469	Low Reference
24-28	--	--	Not Used
29	GY	23	Generator Field Duty Cycle Signal
30-32	--	--	Not Used
33	TN	2501	High Speed GMLAN Serial Data Bus -
34	--	--	Not Used
35	TN	2761	Low Reference
36	--	--	Not Used
37	GY	2700	5-Volt Reference
38	--	--	Not Used
39	GY	2704	5-Volt Reference
40-45	--	--	Not Used
46	OG/BK	1786	Park/Neutral Signal
47	--	--	Not Used
48	D-GN/WH	428	EVAP Canister Purge Solenoid Control
49	D-GN	335	Low Speed Cooling Fan Relay Control
50	OG/WH	3223	HO2S Heater Low Control (Bank 2 Sensor 2)
51-52	--	--	Not Used
53	TN-BK	2500	High Speed GMLAN Serial Data Bus +
54	--	--	Not Used
55	YE	410	ECT Sensor Signal
56	--	--	Not Used
57	OG/BK	380	A/C Refrigerant Pressure Sensor Signal
58	--	--	Not Used
59	L-GN	432	MAP Sensor Signal
60-72	--	--	Not Used
73	BK/WH	1551	Ground