Engine Control Module Connector End Views. Buick Lucerne 2007

For 1990-2009 cars only

Makes 🢒 Buick 🢒 2007 🢒 Lucerne 🢒 HVAC 🢒 HVAC - Automatic 🢒 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: 34576-2803
Service: 88988373
Description: 56-Way F (BU)

Terminal Part Information

Pins: 7, 9, 12, 13, 18, 19, 26, 33, 34, 35, 36, 37, 40, 44, 47, 48, 49, 51, 53, 54, 55
Terminal/Tray: 33467-0005/23
Core/Insulation Crimp: J/J
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Pins: 20
Terminal/Tray: See Terminal Repair Kit
Core/Insulation Crimp: See Terminal Repair Kit
Release Tool/Test Probe: See Terminal Repair Kit

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
14-17	--	--	Not Used
18	D-BU	5985	Accessory Wake up Serial Data
19	PK	439	Ignition 1 Voltage
20	RD/WH	4640	Battery Positive Voltage
21-25	--	--	Not Used
26	YE	447	Starter Relay Coil Control
27-32	--	--	Not Used
33	WH/BK	1164	5-Volt Reference 2
34	GY	416	5-Volt Reference 1
35	TN/BK	1274	5-Volt Reference 1
36	BN	1271	Low Reference
37	PU/WH	1272	Low Reference
38-39	--	--	Not Used
40	OG/WH	5069	PWR/TRAIN Relay Control
41-43	--	--	Not Used
44	PU/BK	1589	Primary Fuel Level Sensor Signal
45-46	--	--	Not Used
47	D-BU/WH	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 Relay Control
52	--	--	Not Used
53	D-GN/WH	459	A/C Compressor Clutch Relay Control
54	OG	473	High Speed Cooling Fan Relay Control
55	TN/WH	1310	EVAP Canister Vent Solenoid Control
56	--	--	Not Used

Engine Control Module (ECM) C2

Connector Part Information

OEM: 34566-2903
Service: 88988931
Description: 73-Way F (BK)

Terminal Part Information

Pins: 24
Terminal/Tray: See Terminal Repair Kit
Core/Insulation Crimp: See Terminal Repair Kit
Release Tool/Test Probe: See Terminal Repair Kit

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

Pins: 1, 2, 3, 4, 5, 6, 7, 8, 9, 16, 17, 18, 19, 23, 25, 27, 29, 31, 32, 33, 34, 35, 39, 41, 42, 43, 44, 48, 49, 51, 52, 53, 54, 55, 59, 61, 62, 63, 64, 66, 67, 70, 71, 72, 11, 12, 13, 68, 69
Terminal/Tray: 33467-0005/23
Core/Insulation Crimp: Pins 1, 2, 3, 4, 5, 6, 7, 8, 9, 16, 17, 18, 19, 23, 25, 27, 29, 31, 32, 33, 34, 35, 39, 41, 42, 43, 44, 48, 49, 51, 52, 53, 54, 55, 59, 61, 62, 63, 64, 66, 67, 70, 71, 72 - J/J
Core/Insulation Crimp: Pins 11, 12, 13, 68, 69 - 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/BK	2121	IC 1 Control
2	TN/OG	3111	HO2S Low Reference Bank 1 Sensor 1
3	D-GN	3110	HO2S Reference Voltage Bank 1 Sensor 1
4	PK/OG	3120	HO2S 2 Reference Voltage
5	TN/PK	3121	HO2S 2 Low Reference
6	PK/YE	1876	Knock Sensor 2 Signal
7	GY	2303	Knock Sensor 2 Signal
8	D-BU	496	Knock Sensor 1 Signal
9	WH/GY	1716	Knock Sensor 1 Signal
10	--	--	Not Used
11	YE	581	TAC Motor Control - 1
12	OG/PK	582	TAC Motor Control - 2
13	PK/BK	5290	Ignition 1 Voltage
14-15	--	--	Not Used
16	RD/BK	878	Fuel Injector 8 Control
17	RD/WH	2122	IC 2 Control
18	L-BU/WH	2126	IC 6 Control
19	BN/WH	2130	Low Reference
20-22	--	--	Not Used
23	BN	6266	Low Reference
24	--	--	Not Used
25	TN/D-GN	2753	Low Reference
26	--	--	Not Used
27	GY/BK	6272	Low Reference
28	--	--	Not Used
29	RD/YE	2752	Low Reference
30	--	--	Not Used
31	GY	435	EGR Solenoid Low Control
32	PK	1746	Fuel Injector 3 Control
33	OG	2127	IC 7 Control
34	D-GN	2125	IC 5 Control
35	BN	2129	Low Reference
36-38	--	--	Not Used
39	PK/WH	6259	5-Volt Reference 2
40	--	--	Not Used
41	PK/TN	2702	5-Volt Reference 1
42	TN/D-BU	2760	Low Reference
43	RD/GY	6270	CKP Sensor 5-Volt Reference 2
44	PK/RD	2701	5-Volt Reference 2
45-47	--	--	Not Used
48	L-GN/BK	1745	Fuel Injector 2 Control
49	TN/WH	845	Fuel Injector 5 Control
50	--	--	Not Used
51	RD/L-BU	1676	EGR Solenoid High 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 8 Control
56-58	--	--	Not Used
59	D-BU/WH	6265	CMP Sensor Signal
60	--	--	Not Used
61	L-GN/RD	1456	EGR Valve Position Signal
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	TN/YE	492	MAF Sensor Signal
68	WH	3113	HO2S Heater Low Control Bank 1 Sensor 1
69	GY/WH	3122	HO2S 2 Heater Low Control
70	YE/BK	846	Fuel Injector 6 Control
71	OG/BK	877	Fuel Injector 7 Control
72	TN/BK	1744	Fuel Injector 1 Control
73	BK/WH	1551	Ground

Engine Control Module (ECM) C3

Connector Part Information

OEM: 34566-3103
Service: 88988372
Description: 73-Way F (GY)

Terminal Part Information

Pins: 3, 4, 7, 8, 9, 18, 21, 23, 26, 29, 33, 35, 37, 39, 42, 46, 48, 49, 53, 55, 57, 59, 62, 65, 15
Terminal/Tray: 33467-0005/23
Core/Insulation Crimp: Pins 3, 4, 7, 8, 9, 18, 21, 23, 26, 29, 33, 35, 37, 39, 42, 46, 48, 49, 53, 55, 57, 59, 62, 65 - J/J
Core/Insulation Crimp: Pins 15 - K/K
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
5-6	--	--	Not Used
7	OG	225	Generator Turn On Signal
8	L-GN	1652	Reverse Lockout Solenoid Control
9	WH/BK	436	AIR Pump Relay Control
10-14	--	--	Not Used
15	L-GN/WH	3112	HO2S Heater Low Control Bank 2 Sensor 1
16-20	--	--	Not Used
21	L-BU	5514	Low Reference
22	--	--	Not Used
23	OG/BK	469	Low Reference
24-25	--	--	Not Used
26	WH/GY	6786	Low Reference
27-28	--	--	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	PK	2761	Low Reference
36	--	--	Not Used
37	GY/BK	2700	5-Volt Reference 1
38	--	--	Not Used
39	GY/WH	2704	5-Volt Reference 1
40-41	--	--	Not Used
42	BN/WH	6790	5-Volt Reference
43-45	--	--	Not Used
46	GY/OG	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
50-52	--	--	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/WH	380	A/C Refrigerant Pressure Sensor Signal
58	--	--	Not Used
59	L-GN/BK	432	MAP Sensor Signal
60-61	--	--	Not Used
62	YE/GY	6788	Air Injection Position Signal
63-64	--	--	Not Used
65	YE/D-GN	231	Oil Pressure Switch Signal
66-73	--	--	Not Used