2007 Chevrolet HHR LS, AutomaticFACTORY OEM SERVICE PROCEDURE

Engine Control Module (ECM) Connector End View C1

Fig 1: Connector End View
GM1228485Courtesy of GENERAL MOTORS CORP.
Connector Part Information

Connector Part Information 
  • OEM: 34576-3503
  • Service: 88988367
  • Description: 56-Way F Micro-Pack 64 Series (BK)
Terminal Part Information 
  • Pins: 2, 6, 7, 9, 12, 13, 18-20, 33-37, 40, 44, 47-49, 53, 55, 56
  • Terminal/Tray: 15359541/4
  • Core/Insulation Crimp: M/M
  • Release Tool/Test Probe: 15381651-2/J-35616-64B (L-BU)
Connector Terminal Identification

Pin Wire Color Circuit No. Function
1 - - Not Used
2 PU 420 TCC Brake Switch/Cruise Control Release Signal
3-5 - - Not Used
6 BN/WH 379 Cruise Control Clutch Pedal Position Switch Signal (w/M86)
7 L-BU 20 Stop Lamp Supply Voltage
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 (- Primary)
14-17 - - Not Used
18 BN 4 Accessory Voltage
19 PK 1039 Ignition 1 Voltage
20 RD/WH 840 Battery Positive Voltage
21-32 - - Not Used
33 WH/BK 1164 5-Volt Reference
34 GY 2709 5-Volt Reference
35 TN 1274 5-Volt Reference
36 BN 1271 Low Reference
37 PU 1272 Low Reference
38-39 - - Not Used
40 BN 5069 Powertrain Relay Control
41-43 - - Not Used
44 PU 1589 Fuel Level Sensor Signal (+ Primary)
45-46 - - Not Used
47 D-BU 1161 APP Sensor 1 Signal
48 D-GN 890 Fuel Tank Pressure Sensor Signal
49 L-BU 1162 APP Sensor 2 Signal
50-52 - - Not Used
53 D-GN/WH 459 A/C Compressor Clutch Relay Control
54 - - Not Used
55 WH 1310 EVAP Canister Vent Solenoid Control
56 YE 447 Starter Relay Coil Control
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.