BCM General Description
The BCM incorporates relays and controllers which are used for the following systems and controls them.
BCM Input/Output Table
| Control | Input | Output |
|---|---|---|
| Power door lock system | Key cylinder switch Manual door lock switch | Each door lock actuator |
| Keyless entry system | Key reminder switch Keyless entry receiver Each door switch | Each door lock actuator Turn signal and hazard warning relay Interior light |
| Keyless start system (1) (Door lock function) | Keyless start control module | Each door lock actuator Turn signal and hazard warning relay Interior light |
| Keyless start system (1) (Trunk lid opener function) | Keyless start control module | Trunk lid opener actuator |
| Rear wiper (1) | Rear wiper switch (INT, LO, WASH (1) | Rear wiper relay |
| Combination meter | Tail light switch Oil pressure switch Parking brake switch Driver side seat belt switch Brake fluid level switch Generator Each door switch TPMS receiver (1) | Combination meter |
| Interior light | Each door switch Key reminder switch | Interior light |
| Warning buzzer | Key reminder switch Tail light switch Driver side door switch Keyless start control module (1) | Warning buzzer (located in combination meter) |
| Rear end door window/back window defogger | Rear end door window/back window defogger switch Generator | Rear end door window/back window defogger relay |
| Rear end door opener (1) | Manual door lock switch (unlock signal) Key cylinder switch (unlock signal) Keyless entry transmitter (unlock signal) Rear end door opener switch | Rear end door opener relay |
| Door lock canceller | SDM (air bag deployment signal) | Each door lock actuator |
| Theft deterrent light | Ignition switch | Theft deterrent light (located in hazard warning switch) |
| Panic alarm function | Panic alarm request signal | Headlight low or high relay Tail light relay Horn relay |
| Tail light | Lighting switch | Tail light relay |
| Seat belt reminder (1) | Seat belt switch signal Vehicle speed signal | Combination meter Hazard warning switch Warning buzzer (located in combination meter) |
| DRL system (1) | Lighting switch ECM (engine ON, OFF signal) Generator Parking brake switch | Combination meter Headlight low beam |
| Front fog light (1) | Lighting switch Front fog light switch | Front fog light relay |
| Security alarm system (1) | Battery voltage Door switch status Door lock status Ignition switch Key reminder switch Keyless start control module (1) | Horn relay Hazard warning relay Warning buzzer (located in combination meter) Theft deterrent light (in hazard warning switch) |
| (1) If equipped Also, the BCM has a function to cause the interior light and open door warning light in the combination meter to turn off when any door is left open for longer than 15 minutes to reduce wasteful battery consumption. In addition, it is possible to check operation of actuator which is controlled by BCM by using the output test function of SUZUKI scan tool to operate actuator simulatively. | ||
| (1) | If equipped Also, the BCM has a function to cause the interior light and open door warning light in the combination meter to turn off when any door is left open for longer than 15 minutes to reduce wasteful battery consumption. In addition, it is possible to check operation of actuator which is controlled by BCM by using the output test function of SUZUKI scan tool to operate actuator simulatively. |
BCM INPUT/OUTPUT REFERENCE CHART
CAN Communication System Description
Refer to CAN COMMUNICATION SYSTEM DESCRIPTION for CAN communication system description.
Theft Deterrent Light Description
The hazard warning switch (1) of this vehicle includes a theft deterrent light (2) for the theft preventive purpose. The BCM makes the theft deterrent light flash at certain intervals after the ignition switch is turned off until it is turned on again. Also, DTCs stored in BCM can be checked by reading the flashing patterns of the theft deterrent light when diagnosing troubles.
Scheme 1
Operation
The security alarm system provides a warning of an abnormal condition to those who are around. Its operation is as follows. While the system is in the stand-by mode (when 20 seconds or more elapsed after the door is locked using a keyless entry transmitter or door request switch), BCM monitors door lock status, door switch status and battery power supply voltage. When it detects an abnormal condition (door is unlocked by some way other than using keyless entry transmitter or door request switch and opened or cut off BCM power supply voltage temporarily), it activates the warning buzzer (located in combination meter), theft deterrent light, hazard warning relay and horn relay.
The security alarm system has 2 selectable modes.
- A mode: No operation
- B mode: Theft deterrent light blinks, hazard warning lights blink, warning buzzer (located in combination meter) sounds and horn sounds
When "B" mode is selected and the door is locked using keyless entry transmitter or door request switch, the theft deterrent light (1) flashes at 0.1 second interval for 20 seconds and the security alarm system is set to the stand-by mode (2). Once it is set to the stand-by mode, the theft deterrent light blinks at 2 second intervals.
When the system is set to stand-by mode and the door is unlocked by some way other than using keyless entry transmitter or door request switch and opened or cut off BCM power supply voltage temporarily, the alarm devices operate according to the selected mode as described above.
Scheme 2
The alarm stops under either of the following conditions.
- Ignition switch is turned ON
- A certain time has elapsed since the alarm started
For selection of the mode of the security alarm system, refer to SECURITY ALARM MODE SELECTION PROCEDURE (IF EQUIPPED).
Reference: BCM GENERAL DESCRIPTION
Scheme 3
Scheme 4
Flow Test Description
Step 1: Check charging system
Step 1: Check whether malfunction is in outside air temperature sensor .
Step 2: Check outside air temperature sensor circuit .
Step 1: Check air bag communication circuit .
Step 2: Check air bag communication circuit .
Step 1: Check DTC for SDM .
See also:
• CAN COMMUNICATION SYSTEM DESCRIPTION