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Back View of PCM Connector End View C4

Back View of PCM Connector End View C4

GM789641Courtesy of GENERAL MOTORS CORP.
Connector Part Information
  • 31-Pin
  • WH
Pin Wire Color Function
1 BK Ignition Positive Voltage
2 - Not Used
3 RD/WH Battery Voltage
4 BK/BU Secondary AIR Solenoid Valve Control
5 BK/OG Secondary AIR Pump Relay Control
6 - Not Used
7 PK/BK Heated Oxygen Sensor (HO2S) 2 Heater Circuit Control
8 - Not Used
9 BK/OG Ignition Positive Voltage
10 YE AC Request Signal
11 RD/YE MIL Control
12 GN Electrical Load Idle-Up Signal, Tail Lamps
13 WH Electrical Load Idle-Up Signal, Rear Defogger
14 YE Supplemental Inflatable Restraint (SIR) System Signal
15-18 - Not Used
19 PK Data Link Connector (DLC)
20 PK/BK Diagnostic Request Circuit
21 BU Fuel Tank Pressure (FTP) Sensor Input
22-31 - Not Used