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.
Body Control Module: Description
The system is equipped with 3 body control modules, the Dash Integration Module (DIM), Instrument Panel Integration Module (IPM), and the Rear Integration Module (RIM). Each module is connected to a Class-II serial data line. Many control signals are implemented by the serial data line.
The DIM functions include, power mode control (ignition switch state), control of headlights, front foglights, exterior lights, interior lights dimming, steering wheel controls, theft deterrent horn relay, HVAC compressor low side temperature, and hood ajar switch input (export models).
The IPM functions include, front HVAC air delivery and temperature controls, ambient light sensor input, headlight twilight delay input, foglight switch input, instrument panel dimmer switch input, traction control switch input, interior lights switch input, key in ignition input, fuel door and trunk lid release switch input, and ignition switch headlight control.
The RIM functions include, fuel level sensor input, heated seat controls, HVAC blower control, rear defogger control, parking brake relay controls, interior lights control, back-up light and automatic day/night mirror, rear foglights, fuel door/trunk lid release controls, RAP control for sun roof module, door ajar switch and tamper switch inputs from trunk lid, and anti-theft alarm.
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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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