For 1990-2009 cars

Connector 1: | ECM X2

### ECM X2

#### Connector Part Information

- OEM: BOSCH 1928404780 (W/Cover)
- Service: N/A
- Description: 58-Way F ECU Sealed

#### ECM X2

Pin | Wire Color | Circuit No. | Function
--- | --- | --- | ---
1 | BK | -- | Ground
2 | BK | -- | Ground
3 | PK/BK | -- | Engine Main Relay Fused Control (1)
4 | BK | -- | Ground
5 | PK/BK | -- | Engine Main Relay Fused Control (1)
6 | PK/BK | -- | Engine Main Relay Fused Control (1)
7 | GY/WH | -- | Heated O2 Sensor Low Bank 1 (2)
8 | -- | -- | Not Used
9 | BN | -- | Sensor Low Reference
10 | D-GN/WH | -- | Fuel Pump Primary Relay
11 | BN | -- | Sensor Low Reference
12 | -- | -- | Not Used
13 | YE | -- | Mass Air Flow Sensor Signal
14 | -- | -- | Not Used
15 | D-BU | -- | APM Signal (1)
16 | BN/WH | -- | Cruise Control Clutch S/W Signal
17 | OG/BN | -- | Trans Park/Neutral Signal (1)
18 | PK/BK | -- | Engine Reverse Gear SW Signal
19 | -- | -- | Not Used
20 | OG/WH | -- | Heat O2 Sensor Low Bank 2 (2)
21 | -- | -- | Not Used
22 | BN | -- | Intake Air Temperature Sensor Low Reference
23 | BN/WH | -- | Heat O2 Low Signal Bank 1 (2)
24 | BN | -- | Heated O2 Low Signal Bank 1 Sensor (2)
25 | L-BU | -- | APM Signal (1)
26 | L-BU | -- | Secondary Fuel Level Sensor Signal
27-33 | -- | -- | Not Used
34 | BN | -- | APM Low Reference (1)
35 | D-GN | -- | 5-Volt Reference
36 | D-BU | -- | Primary Fuel Level Sensor
37 | -- | -- | Not Used
38 | PU/WH | -- | Heated O2 Sensor High Signal Bank 1 (2)
39 | OG/BK | -- | ACP Sensor Signal
40 | -- | -- | Not Used
41 | D-BU | -- | Accessory Wakeup Serial Data
42 | BN/BK | -- | High Speed GMLAN Serial Data (+) 1
43 | -- | -- | Not Used
44 | D-GN/WH | -- | A/C Compressor Clutch Relay Control
45 | D-BU | -- | High Speed Cooling Fan Relay Control
46 | D-GN | -- | Low Speed Cooling Fan Relay Control
47 | PU | -- | APM Low References (2)
48 | BN | -- | APM 5-Volt Reference (2)
49 | WH/BK | -- | APM 5-Volt Reference (1)
50 | BN | -- | Intake Air Temperature Sensor Signal
51 | PU | -- | Heated O2 High Signal Bank 2 (2)
52 | L-BU | -- | Stop Lamp Supply Voltage
53 | -- | -- | Not Used
54 | PK | -- | Run/Crank Ignition 1 Voltage
55 | BN | -- | High Speed GMLAN Serial Data (-) 1
56 | RD/WH | -- | Battery Positive Voltage
57 | PU/WH | -- | Starter Relay Coil Control
58 | BN | -- | Engine Main Relay Coil Control