Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2007 Chevrolet HHR LS, AutomaticFACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| Body Control Module (BCM) | Under center dash, below radio, on right side of center console. See Figure. |
| Electronic Brake Control Module (EBCM) | Left side of engine compartment, in front of engine control module (ECM). See Figure. |
| Engine Control Module (ECM) | Left side of engine compartment, in front of underhood fuse block. See Figure. |
| Heated Seat Control Module - Driver | Under front center of driver seat. See Figure. |
| Heated Seat Control Module - Passenger | Under front center of front passenger's seat. See Figure. |
| Ignition Coil Module 1 | On top of engine, under cover at cylinder No. 1. See Figure. |
| Ignition Coil Module 2 | On top of engine, under cover at cylinder No. 2. See Figure. |
| Ignition Coil Module 3 | On top of engine, under cover at cylinder No. 3. See Figure. |
| Ignition Coil/Module 4 | On top of engine, under cover at cylinder No. 4. See Figure. |
| Inflatable Restraint Front Passenger Presence System (PPS) Module | Under front passenger's seat. See Figure. |
| Inflatable Restraint Instrument Panel (I/P) Module | Right side of dash, above glove compartment. See Figure. |
| Inflatable Restraint Roof Rail Module - Left | Above front & rear left door rails behind headliner. See Figure. |
| Inflatable Restraint Roof Rail Module - Right | Above front & rear right door rails behind headliner. See Figure. |
| Inflatable Restraint Sensing & Diagnostic Module (SDM) | Under center console, forward of park brake. See Figure. |
| Inflatable Restraint Steering Wheel Module | In steering wheel. See Figure. |
| Power Steering Control Module (PSCM) | Lower left of dash, attached to steering column. See Figure. |
| Remote Control Door Lock Receiver (RCDLR) | Behind left rear quarterpanel. See Figure. |
| Sunroof Control Module | Center of headliner. See Figure. |
| Theft Deterrent Control Module | Right side of steering column, at ignition switch. See Figure. |
| Throttle Actuator Control (TAC) Module (2.2L) | Top of engine. See Figure. |
| Throttle Actuator Control (TAC) Module (2.4L) | Top of intake manifold. See Figure. |
| Transmission Control Module (TCM) | Left side of engine compartment. See Figure. |
| Vehicle Communication Interface Module (VCIM) | Right rear corner of vehicle. See Figure. |
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.