Powertrain Control Module (PCM) X1 (LAX)

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

Courtesy of GENERAL MOTORS CORP.

Pin	Wire	Circuit	Function
1	1.25 BK	-	Ignition Voltage
2	1.25 BK	-	Ignition Voltage
3	0.3 BK	-	Battery Positive Voltage
4-6	-	-	Not Used
7	0.3 OG	-	Fuel Pump Relay Control
8	0.3 VT	-	Vehicle Speed Sensor Signal
9	0.3 WH/BK	-	Ground
10	0.3 L-GN/BK	-	Immobilizer Signal Out
11	0.3 PK	-	Immobilizer Signal In
12-14	-	-	Not Used
15	0.3 GY	-	Engine Speed Signal
16	0.3 WH	-	Shift Switch Tap Up Signal (MVA/MVC/MVD)
17-19	-	-	Not Used
20	1.25 PK	-	Battery Positive Voltage
21	0.3 RD	-	Low Speed Cooling Fan Relay Control
22	0.3 WH	-	High Speed Cooling Fan Relay Control
23	-	-	Not Used
24	0.3 RD	-	MIL Control
25-26	-	-	Not Used
27	0.5 PK	-	Low Speed Serial Data
28	0.3 BK	-	Ignition Voltage
29-30	-	-	Not Used
31	0.5 BK	-	Rear Defog Supply Voltage
32	0.3 WH/BK	-	Ground
33	0.5 D-GN	-	Park Lamp Switch Signal
34	0.3 RD	-	EVAP Pump Control
35	0.3 RD	-	Stop Lamp Switch Signal (Ignition)
36	0.5 D-BU	-	Stop Lamp Switch Signal (Battery)
37-39	-	-	Not Used
40	0.3 D-BU/BK	-	Cruise Control Switch Signal (K34)
41	0.3 YE	-	High Speed GMLAN Serial Data Bus+
42	0.3 WH	-	EVAP Vent Solenoid Control
43	-	-	Not Used
44	0.3 D-BU	-	Main Relay Control
45-47	-	-	Not Used
48	0.5 L-GN	-	Park/Neutral Switch Signal (MVA/MVC/MVD)
49	0.3 WH	-	High Speed GMLAN Serial Data Bus-
50	-	-	Not Used
51	0.3 RD	-	Shift Switch Tap Down Signal (MVA/MVC/MVD)
52-54	-	-	Not Used
55	0.3 D-BU	-	5-Volt Reference 1
56	0.3 YE	-	5-Volt Reference 1
57	0.3 PK	-	APP Sensor 1 Signal
58	0.3 BK	-	APP Sensor 2 Signal
59	0.3 RD	-	Low Reference
60	0.3 OG	-	Low Reference

Connector Part Information