Powertrain Control Module (PCM) X1 (L26)

WARNING: This page is about a different car, the 2008 Buick Lucerne. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Powertrain Control Module (PCM) X1 (L26) Connector End View

Courtesy of GENERAL MOTORS CORP.

Pin	Wire	Circuit	Function
1	0.5 TN/BK	2500	High Speed GMLAN Serial Data Bus +
2	0.5 TN	2501	High Speed GMLAN Serial Data Bus -
3	-	-	Not Used
4	0.5 GY	2700	5-Volt Reference 1
5	-	-	Not Used
6	0.5 BN/WH	419	MIL Control
7	0.5 YE/GY	5514	Low Reference
8	0.5 TN	2759	Low Reference
9	-	-	Not Used
10	0.5 TN/WH	1310	EVAP Canister Vent Solenoid Control
11	-	-	Not Used
12	0.5 WH/GY	6786	Low Reference (NU6)
13-17	-	-	Not Used
18	0.5 D-BU/WH	5985	Accessory Wake up Serial Data
19	0.5 PK	439	Ignition 1 Voltage
20	0.5 RD/WH	4640	Battery Positive Voltage
21	-	-	Not Used
22	0.5 PU/BK	389	Vehicle Speed Signal
23	0.5 YE	447	Starter Relay Coil Control
24	0.5 BN	5069	PWR/TRN Relay Control
25	-	-	Not Used
26	0.5 D-GN	890	Fuel Tank Pressure Sensor Signal
27-30	-	-	Not Used
31	0.5 OG/BK	380	A/C Refrigerant Pressure Sensor Signal
32	0.5 WH	17	Stop Lamp Switch Signal
33	0.5 D-GN/WH	459	A/C Compressor Clutch Relay Control
34	0.5 WH/BK	436	AIR Pump Relay Control (NU6)
35-36	-	-	Not Used
37	0.5 D-GN/WH	465	Fuel Pump Relay Control
38-42	-	-	Not Used
43	0.5 PU/BK	1589	Primary Fuel Level Sensor Signal
44-47	-	-	Not Used
48	0.5 TN/OG	335	Low Speed Cooling Fan Relay Control
49	-	-	Not Used
50	0.5 L-BU	473	High Speed Cooling Fan Relay Control
51-52	-	-	Not Used
53	0.5 GY	416	5-Volt Reference 1
54-56	-	-	Not Used

Connector Part Information

OEM: 15497530 (-NU6), 13528606 (NU6)
Service: See Catalog
Description: 56-Way F Micro-Pack, Sealed (BU)

Terminal Part Information

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