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.
1987 Pontiac Bonneville SEFACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| ABS Control Module | Behind left side of instrument panel. |
| A/C Blower Control Module | On right side of firewall, center of plenum. See Figure . |
| Cruise Control Module | Above accelerator pedal. See Figure . |
| Digital Cluster Decoder Module | Under right side of dash. See Figure . |
| Elect. Climate Control Power Module | On right side of firewall, above blower motor. |
| Elect. Climate Control Programmer | Under right side of dash near left side of glove box. |
| Electronic Control Module (ECM) | Under right side of dash near kick panel. |
| Elect. Spark Control (ESC) Module | On right side of firewall, above plenum. See Figure . |
| Lights Monitor Module (Bonneville) | Right side of dash, behind glove box. |
| Multi-Function Chime Module | Behind right side of dash trim, above glove box. |
| PRNDL Decoder Module (Delta 88/Digital Cluster) | Right side of dash, behind glove box. |
| Remote Dimmer Module | Behind left side of dash, above ALCL connector. |
| Twilight Sentinel Amplifier (Bonneville) | Behind right side of dash, on right side of steering column bracket. |
| Twilight Sentinel Amplifier (Delta 88) | Above glove box, right side of dash. |
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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