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.
2012 Suzuki SX4 BaseFACTORY OEM SERVICE PROCEDURE
Body Electrical Control System
- Precautions
- General Description
- Schematic and Routing Diagram
- Component Location
- Diagnostic Information and Procedures
- BCM Self-Diagnosis Function
- Body Electrical Control System Check
- Scan Tool Data
- BCM
- Scan Tool Data Definitions
- Notes
- Battery Voltage (V)
- ECT (Engine Coolant Temperature) (°C, °F)
- Fuel Consumption (km/l)
- Vehicle Speed (km/h, mph)
- Engine Speed (RPM)
- Driv Door SW (Driver side door switch) (Open/Close)
- Pass Door SW (Other than driver side door switch) (Open/Close)
- Rear End Door Opener (Rear end door opener switch) (ON/OFF)
- Trunk SW (Trunk lid switch) (ON/OFF)
- Rear Defogger SW (Rear end door window/back window defogger switch) (ON/OFF)
- Front Fog Light SW (Front fog light switch) (ON/OFF)
- Door Key SW (Lock) (Door key cylinder switch (lock side)) (ON/OFF)
- Door Key SW (Unlock) (Door key cylinder switch (unlock side)) (ON/OFF)
- Manual SW (Manual door lock switch (lock side)) (ON/OFF)
- Manual SW (Manual door lock switch (unlock side)) (ON/OFF)
- Key Reminder SW (Key reminder switch) (Pulled/Key in)
- Headlight SW (Headlight switch) (ON/OFF)
- Tail Light SW (Lighting switch) (ON/OFF)
- Driv Seatbelt SW (Driver seat belt switch) (Fasten/Unfasten)
- A/B Signal Error (detected/Not dete)
- Brake Fluid Level (Low/Normal)
- Parking Brake SW (Parking brake switch) (ON/OFF)
- Charge Light (ON/OFF)
- Oil Pressure SW (ON/OFF)
- A/C SW (On/Off)
- Ignition 1 Switch (Ignition switch ON position) (ON/OFF)
- ACC Switch (Ignition switch ACC position) (ON/OFF)
- Rear Wiper ON SW (Rear wiper ON switch) (ON/OFF)
- Rear Wiper INT SW (Rear wiper INT switch) (ON/OFF)
- Rear Washer SW (Rear washer switch) (ON/OFF)
- Security Alarm (Active/Passive)
- Diagnosis Using Output Test Function of SUZUKI Scan Tool
- DTC Table
- DTC Check
- DTC Clearance
- BCM Power Circuit and Ground Circuit Check
- DTC B1133 (No. 1133): Battery Voltage Too High
- DTC B1141/B1142 (No. 1141/1142): Outside Air Temperature (Ambient Temp.) Sensor Circuit Malfunction
- DTC B1150 (No. 1150): Air Bag Communication Circuit Malfunction
- DTC B1157 (No. 1157): Air Bag Deployment Signal Input
- DTC B1170 (No. 1170): EEPROM Access Error
- DTC U0073 (No. 0073): Control Module Communication Bus Off
- DTC U0100 (No. 0100): Lost Communication with ECM
- DTC U0101 (No. 0101): Lost Communication with TCM
- DTC U0144 (No. 0144): Lost Communication with Keyless Start Control Module
- DTC U0151 (No. 0151): Lost Communication with Restraints Control Module
- DTC U0155 (No. 0155): Lost Communication with Instrument Panel Cluster (IPC) Control Module
- Inspection of BCM and Its Circuits
- Notes
- Voltage Check
- Notes
- BCM connector "G04"
- BCM connector "G05"
- BCM connector "G06"
- Reference Waveform
- Reference waveform No. 1
- Reference waveform No. 2
- Reference waveform No. 3
- Reference waveform No. 4
- Reference waveform No. 5
- Reference waveform No. 6
- Reference waveform No. 7
- Reference waveform No. 8
- Reference waveform No. 9
- Reference waveform No. 10
- Repair Instructions
- Special Tools and Equipment
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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