Suzuki Vitara (LY) 2016-2017 · Service Manual Diagnostic Information and Procedures

Inspection of BCM and Its Circuits

Precautions: Precautions for Diagnosing Trouble · Precautions for Control Systems · General safety (00)

Voltage and Signal Check
Check voltage and/or pulse signal of BCM (1) using voltmeter (2) and oscilloscope (3).
NOTE:
•Check that battery voltage is 12 V or more.
•The voltage of terminal with asterisk (*) cannot be measured by voltmeter because it is pulse signal. Check it with oscilloscope if necessary.
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[A]: BCM connector (View: [a])
“E05” connector
Terminal No. Wire color Circuit Normal voltage Condition
E05-1 RED Turn signal light signal (R) 0 ← → 14 V Right turn signal light: Blink
E05-2 LT GRN Rear fog light relay control (if equipped) Approx. 0 V Lighting switch: ON
Rear fog light switch: ON
10 – 14 V Other than above condition
E05-3 — — — —
E05-4 — — — —
E05-5* RED CAN communication line (high) Refer to CAN communication signal.
E05-6* WHT CAN communication line (low)
E05-7* WHT Air bag communication signal (RBS model) Refer to Air bag communication signal.
E05-8 BRN Ground for outside air temperature sensor Approx. 0 V —
E05-9* YEL Rear center seat belt buckle switch signal (if equipped) Refer to Rear center seat belt buckle switch signal and rear right seat belt buckle switch signal.
Approx. 0 V Ignition: “ON”
Rear center seat belt: Unfasten
E05-10* RED Rear right seat belt buckle switch signal (if equipped) Refer to Rear center seat belt buckle switch signal and rear right seat belt buckle switch signal.
Approx. 0 V Ignition: “ON”
Rear right seat belt: Unfasten
E05-11 LT GRN Front fog light relay control (if equipped) 10 – 14 V Lighting switch: ON
Front fog light switch: OFF
Approx. 0 V Other than above condition
E05-12 WHT Windshield wiper position signal (LED headlight model) 0 ← → 14 V Windshield wiper: In operation
Approx. 0 V Windshield wiper position: Stop position
E05-13 BLU Turn signal light signal (L) 0 ← → 14 V Left turn signal light: Blink
E05-14 — — — —
E05-15 GRN DRL control signal (if equipped) Approx. 0 V DRL: ON
10 – 14 V Other than above condition
E05-16 — — — —
E05-17 — — — —
E05-18* GRN Brake fluid level switch signal Refer to Brake fluid level switch signal, A/C switch signal, rear fog light switch signal, lighting switch (AUTO) signal and power door lock switch signal.
Approx. 0 V Ignition: “ON”
Brake fluid level: Lower than MIN level
E05-19* BLU Oil pressure switch signal Refer to Oil pressure switch signal.
Approx. 0 V Ignition: “ON”
Engine: Stop
E05-20 LT GRN Outside air temperature sensor signal Approx. 2.7 V Ignition: “ON”
Outside air temperature: 0 °C (32 °F)
Approx. 1.6 V Ignition: “ON”
Outside air temperature: 20 °C (68 °F)
E05-21 — — — —
E05-22 PNK Windshield wiper Hi/Lo relay (LED headlight model) Approx. 0 V Ignition: “ON”
Windshield wiper switch: HI position
10 – 14 V Other than above condition
E05-23 BRN Windshield wiper relay (LED headlight model) Approx. 0 V Ignition: “ON”
Windshield wiper switch: LO or HI position
10 – 14 V Other than above condition
E05-24 — — — —
“G04” connector
Terminal No. Wire color Circuit Normal voltage Condition
G04-1* WHT CAN communication line (low) (if equipped) Refer to CAN communication signal.
G04-2* RED CAN communication line (high) (if equipped)
G04-3 YEL Front fog light switch signal (if equipped) 10 – 14 V Lighting switch: ON
Front fog light switch: ON
Approx. 0 V Other than above condition
G04-4 BRN Lighting switch signal (CLEARANCE) Approx. 0 V Lighting switch: “CLEARANCE” position or “HEAD” position.
10 – 14 V Other than above condition
G04-5* PNK Lighting switch signal (HEAD) (halogen headlight model with DRL) Approx. 0 V Lighting switch: “HEAD” position
Refer to Lighting switch signal (HEAD).
Lighting switch signal (HEAD) (LED headlight model) Approx. 0 V Lighting switch: “HEAD” position, or “AUTO” position with headlight lit up
10 – 14 V Other than above condition
G04-6 BEG Ground for evaporator temperature sensor, driving mode switch and windshield wiper interval adjustment switch (if equipped) Approx. 0 V —
G04-7 LT GRN Windshield wiper interval adjustment switch signal (LED headlight model) About 5 V Wiper interval adjustment switch: “+” position
About 0 V Wiper interval adjustment switch: “–” position
G04-8 PNK Driving mode switch signal (4WD model) 0.3 – 0.7 V Ignition: “ON”
Driving mode switch: AUTO position
1.3 – 1.8 V Ignition: “ON”
Driving mode switch: SPORT position
2.3 – 2.9 V Ignition: “ON”
Driving mode switch: SNOW position
3.2 – 3.9 V Ignition: “ON”
Driving mode switch: LOCK position
4.1 – 4.7 V Other than above condition
G04-9 RED Glove box light switch signal (if equipped) 10 – 14 V Glove box: After 15 minutes from open
Approx. 0 V Other than above condition
G04-10* WHT A/C switch signal (manual A/C model) Refer to Brake fluid level switch signal, A/C switch signal, rear fog light switch signal, lighting switch (AUTO) signal and power door lock switch signal.
Approx. 0 V Ignition: “ON”
Blower speed selector: Other than OFF position
A/C switch: Pushed
G04-11* YEL Windshield wiper switch signal (AUTO) (LED headlight model) Refer to Windshield wiper switch (AUTO) signal, rear wiper switch signal, turn signal switch signal, hazard warning switch signal, rear left seat belt buckle switch signal, rear defogger switch signal, FAR/NEAR setting switch signal, RBS OFF switch signal, driver seat belt buckle switch signal and passenger seat belt buckle switch signal.
Approx. 0 V Ignition: “ON”
Windshield wiper switch: AUTO position
G04-12* BEG Rear wiper switch signal (INT) Refer to Windshield wiper switch (AUTO) signal, rear wiper switch signal, turn signal switch signal, hazard warning switch signal, rear left seat belt buckle switch signal, rear defogger switch signal, FAR/NEAR setting switch signal, RBS OFF switch signal, driver seat belt buckle switch signal and passenger seat belt buckle switch signal.
Approx. 0 V Ignition: “ON”
Rear wiper switch: INT position
G04-13* LT GRN Turn signal switch signal (L) Refer to Windshield wiper switch (AUTO) signal, rear wiper switch signal, turn signal switch signal, hazard warning switch signal, rear left seat belt buckle switch signal, rear defogger switch signal, FAR/NEAR setting switch signal, RBS OFF switch signal, driver seat belt buckle switch signal and passenger seat belt buckle switch signal.
Approx. 0 V Ignition: “ON”
Turn signal switch (L): ON
G04-14* LT BLU Turn signal switch signal (R) Refer to Windshield wiper switch (AUTO) signal, rear wiper switch signal, turn signal switch signal, hazard warning switch signal, rear left seat belt buckle switch signal, rear defogger switch signal, FAR/NEAR setting switch signal, RBS OFF switch signal, driver seat belt buckle switch signal and passenger seat belt buckle switch signal.
Approx. 0 V Ignition: “ON”
Turn signal switch (R): ON
G04-15* WHT Hazard warning switch signal Refer to Windshield wiper switch (AUTO) signal, rear wiper switch signal, turn signal switch signal, hazard warning switch signal, rear left seat belt buckle switch signal, rear defogger switch signal, FAR/NEAR setting switch signal, RBS OFF switch signal, driver seat belt buckle switch signal and passenger seat belt buckle switch signal.
Approx. 0 V Hazard warning switch: ON
G04-16* BEG Rear fog light switch signal (if equipped) Refer to Brake fluid level switch signal, A/C switch signal, rear fog light switch signal, lighting switch (AUTO) signal and power door lock switch signal.
Approx. 0 V Rear fog light switch: ON
G04-17 RED Windshield wiper switch signal (LO) (LED headlight model) Approx. 0 V Ignition: “ON”
Windshield wiper switch: LO or HI position
10 – 14 V Other than above condition
G04-18 GRN Windshield wiper switch signal (HI) (LED headlight model) Approx. 0 V Ignition: “ON”
Windshield wiper switch: HI position
10 – 14 V Other than above condition
G04-19 BLU Front fog light switch indicator (if equipped) Approx. 0 V Lighting switch: Other than OFF position
Front fog light switch: ON
Front fog light switch indicator: Light up
10 – 14 V Other than above condition
G04-20 — — — —
G04-21* LT GRN Lighting switch signal (AUTO) (LED headlight model) Refer to Brake fluid level switch signal, A/C switch signal, rear fog light switch signal, lighting switch (AUTO) signal and power door lock switch signal.
Approx. 0 V Lighting switch: AUTO position
G04-22 — — — —
G04-23 PPL Power supply for windshield wiper interval adjustment switch (LED headlight model) 4 – 6 V Ignition: “ON”
G04-24 GRN Evaporator temperature sensor signal (if equipped) Approx. 3.2 V Ignition: “ON”
A/C outlet port temperature: 0 °C (32 °F)
Approx. 1.8 V Ignition: “ON”
A/C outlet port temperature: 25 °C (77 °F)
G04-25* LT BLU Rear left seat belt buckle switch signal (if equipped) Refer to Windshield wiper switch (AUTO) signal, rear wiper switch signal, turn signal switch signal, hazard warning switch signal, rear left seat belt buckle switch signal, rear defogger switch signal, FAR/NEAR setting switch signal, RBS OFF switch signal, driver seat belt buckle switch signal and passenger seat belt buckle switch signal.
Approx. 0 V Ignition: “ON”
Rear left seat belt: Unfasten
G04-26* BRN Rear defogger switch signal (non-A/C model and manual A/C model) Refer to Windshield wiper switch (AUTO) signal, rear wiper switch signal, turn signal switch signal, hazard warning switch signal, rear left seat belt buckle switch signal, rear defogger switch signal, FAR/NEAR setting switch signal, RBS OFF switch signal, driver seat belt buckle switch signal and passenger seat belt buckle switch signal.
Approx. 0 V Ignition: “ON”
Rear defogger switch: Pushed
G04-27 BLU Windshield wiper switch signal (WASH) (LED headlight model) Approx. 0 V Ignition: “ON”
Windshield wiper switch: WASH position
10 – 14 V Other than above condition
G04-28 PNK Rear wiper switch signal (WASH) 10 – 14 V Ignition: “ON”
Rear wiper switch: OFF
Approx. 0 V Ignition: “ON”
Rear wiper switch: WASH position
G04-29* GRN Rear wiper switch signal (ON) Refer to Windshield wiper switch (AUTO) signal, rear wiper switch signal, turn signal switch signal, hazard warning switch signal, rear left seat belt buckle switch signal, rear defogger switch signal, FAR/NEAR setting switch signal, RBS OFF switch signal, driver seat belt buckle switch signal and passenger seat belt buckle switch signal.
Approx. 0 V Ignition: “ON”
Rear wiper switch: ON position
G04-30 — — — —
G04-31* BLU FAR/NEAR setting switch signal (RBS model) Refer to Windshield wiper switch (AUTO) signal, rear wiper switch signal, turn signal switch signal, hazard warning switch signal, rear left seat belt buckle switch signal, rear defogger switch signal, FAR/NEAR setting switch signal, RBS OFF switch signal, driver seat belt buckle switch signal and passenger seat belt buckle switch signal.
Approx. 0 V Ignition: “ON”
FAR/NEAR setting switch: NEAR position
G04-32* PPL Vehicle speed signal (if equipped) Refer to Vehicle speed signal.
“L01” connector
Terminal No. Wire color Circuit Normal voltage Condition
L01-1 GRN Rear door lock actuator control (unlock) 10 – 14 V Unlock signal is output to rear door lock actuators
Approx. 0 V Other than above condition
L01-2 LT GRN Door lock actuator control (lock) 10 – 14 V Lock signal is output to all door lock actuators
Approx. 0 V Other than above condition
L01-3 BRN Rear defogger relay control Approx. 0 V Engine: Running
Rear defogger switch: ON
10 – 14 V Other than above condition
L01-4* WHT CAN communication line (low) Refer to CAN communication signal.
L01-5* RED CAN communication line (high)
L01-6 — — — —
L01-7 — — — —
L01-8* LT BLU RBS OFF switch signal (RBS model) Refer to Windshield wiper switch (AUTO) signal, rear wiper switch signal, turn signal switch signal, hazard warning switch signal, rear left seat belt buckle switch signal, rear defogger switch signal, FAR/NEAR setting switch signal, RBS OFF switch signal, driver seat belt buckle switch signal and passenger seat belt buckle switch signal.
Approx. 0 V Ignition: “ON”
RBS OFF switch: Pushed
L01-9 GRN Power source (IG1) 10 – 14 V Ignition: “ON”
Approx. 0 V Other than above condition
L01-10 BLU Power source (IG2) 10 – 14 V Ignition: “ON”
Approx. 0 V Other than above condition
L01-11 BRN Backup power supply 10 – 14 V —
L01-12 WHT Power supply for turn signal light 10 – 14 V —
L01-13 GRN Turn signal light signal (R) 0 ← → 14 V Right turn signal light: Blink
L01-14 BLK Ground for BCM Approx. 0 V —
L01-15 BLK Ground for BCM Approx. 0 V —
L01-16 — — — —
L01-17 — — — —
L01-18 — — — —
L01-19* YEL Driver seat belt buckle switch signal Refer to Windshield wiper switch (AUTO) signal, rear wiper switch signal, turn signal switch signal, hazard warning switch signal, rear left seat belt buckle switch signal, rear defogger switch signal, FAR/NEAR setting switch signal, RBS OFF switch signal, driver seat belt buckle switch signal and passenger seat belt buckle switch signal.
Approx. 0 V Ignition: “ON”
Driver seat belt: Unfasten
L01-20* GRN Passenger seat belt buckle switch signal (if equipped) Refer to Windshield wiper switch (AUTO) signal, rear wiper switch signal, turn signal switch signal, hazard warning switch signal, rear left seat belt buckle switch signal, rear defogger switch signal, FAR/NEAR setting switch signal, RBS OFF switch signal, driver seat belt buckle switch signal and passenger seat belt buckle switch signal.
Approx. 0 V Ignition: “ON”
Passenger seat belt: Unfasten
Passenger seat: Someone sits on passenger seat
L01-21* LT GRN Parking brake switch signal Refer to Parking brake switch signal.
Approx. 0 V Ignition: “ON”
Parking brake lever: Pulled up
L01-22 — — — —
L01-23 WHT Shift lock solenoid control (A/T model / twin clutch system model) 10 – 14 V Ignition: “ON”
Select lever: P range
Brake pedal: Depressed
Approx. 0 V Other than above condition
L01-24 — — — —
L01-25 YEL Power supply for shift lock solenoid (A/T model / twin clutch system model) 10 – 14 V Ignition: “ON”
Approx. 0 V Other than above condition
L01-26 BLU Turn signal light signal (L) 0 ← → 14 V Left turn signal light: Blink
“L02” connector
Terminal No. Wire color Circuit Normal voltage Condition
L02-1 RED Door lock actuator control (Deadlock unlock) (deadlock model) 10 – 14 V Deadlock unlock signal is output to all door lock actuators
Approx. 0 V Other than above condition
L02-2 YEL Door lock actuator control (Deadlock lock) (deadlock model) 10 – 14 V Deadlock lock signal is output to all door lock actuators
Approx. 0 V Other than above condition
L02-3 BLU Luggage compartment light control (if equipped) 10 – 14 V Luggage compartment light switch: “ON” position
Rear end door: Closed
Approx. 0 V Other than above condition
L02-4 — — — —
L02-5 GRN Foot light control (if equipped) 10 – 14 V All door: Closed
Approx. 0 V Any one of the door: Opened
L02-6 — — — —
L02-7 — — — —
L02-8 — — — —
L02-9 YEL Tail light relay control Approx. 0 V Tail light: light up
10 – 14 V Other than above condition
L02-10 — — — —
L02-11 — — — —
L02-12 BLK Spot light (ON), rear dome light (ON) and vanity light control 10 – 14 V Spot light or rear dome light switch: “ON” position
Spot light, rear dome light and vanity light: After 15 minutes from light up
Approx. 0 V Other than above condition
L02-13 GRY Spot light and rear dome light control (DOOR) 10 – 14 V Spot light or rear dome light switch: “DOOR” position
Spot light and rear dome light: Not light up
Approx. 0 V Other than above condition
L02-14 GRN Passenger door lock actuator control (unlock) 10 – 14 V Unlock signal is output to passenger door lock actuator
Approx. 0 V Other than above condition
L02-15 WHT Driver door lock actuator control (unlock) 10 – 14 V Unlock signal is output to driver door lock actuator
Approx. 0 V Other than above condition
L02-16 — — — —
L02-17 — — — —
L02-18 — — — —
L02-19 — — — —
L02-20 — — — —
L02-21* GRY Power door lock switch signal (Unlock) Refer to Brake fluid level switch signal, A/C switch signal, rear fog light switch signal, lighting switch (AUTO) signal and power door lock switch signal.
Approx. 0 V Power door lock switch: “Unlock” position
L02-22* GRN Power door lock switch signal (Lock) Refer to Brake fluid level switch signal, A/C switch signal, rear fog light switch signal, lighting switch (AUTO) signal and power door lock switch signal.
Approx. 0 V Power door lock switch: “Lock” position
L02-23 — — — —
L02-24 LT GRN Rear wiper relay control 10 – 14 V Ignition: “ON”
Approx. 0 V Ignition: “ON”
Rear wiper: In operation
L02-25 BLU Rear end door opener actuator control 10 – 14 V Rear end door opener actuator: In operation
Approx. 0 V Other than above condition
L02-26 BRN Power supply for door lock actuator 10 – 14 V —
Reference Waveform
Oscilloscope display
Shown below is typical waveform display provided by oscilloscope.
NOTE:
•How to read waveforms is shown below.
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[a]: Waveform of channel 1 [c]: VOLT/DIV of each channel
[b]: Ground level of each channel [d]: TIME/DIV
•Waveform varies depending on measurement condition and vehicle spec.
CAN communication signal
CAN communication signal (High) (1)
Channel Probe Terminal No.
1 + E05-5
G04-2
L01-5
– L01-14
CAN communication signal (Low) (2)
Channel Probe Terminal No.
2 + E05-6
G04-1
L01-4
– L01-14
Measurement condition
•Ignition: “ON”
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Air bag communication signal
Channel Probe Terminal No.
1 + E05-7
– L01-14
Measurement condition
•Ignition: “ON”
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Rear center seat belt buckle switch signal and rear right seat belt buckle switch signal
Rear center seat belt buckle switch signal
Channel Probe Terminal No.
1 + E05-9
– L01-14
Measurement condition
•Ignition: “ON”
•Rear center seat belt: Fasten
Rear right seat belt buckle switch signal
Channel Probe Terminal No.
1 + E05-10
– L01-14
Measurement condition
•Ignition: “ON”
•Rear right seat belt: Fasten
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Brake fluid level switch signal, A/C switch signal, rear fog light switch signal, lighting switch (AUTO) signal and power door lock switch signal
Brake fluid level switch signal
Channel Probe Terminal No.
1 + E05-18
– L01-14
Measurement condition
•Ignition: “ON”
•Brake fluid level switch: OFF (brake fluid level: higher than MIN level)
A/C switch signal
Channel Probe Terminal No.
1 + G04-10
– L01-14
Measurement condition
•Ignition: “ON”
•Blower speed selector: OFF
•A/C switch: Released
Rear fog light switch signal
Channel Probe Terminal No.
1 + G04-16
– L01-14
Measurement condition
•Ignition: “ON”
•Rear fog light switch: OFF
Lighting switch (AUTO) signal
Channel Probe Terminal No.
1 + G04-21
– L01-14
Measurement condition
•Ignition: “ON”
•Lighting switch: Other than AUTO position
Power door lock switch signal (Unlock)
Channel Probe Terminal No.
1 + L02-21
– L01-14
Measurement condition
•Power door lock switch (Unlock): OFF
Power door lock switch signal (Lock)
Channel Probe Terminal No.
1 + L02-22
– L01-14
Measurement condition
•Power door lock switch (Lock): OFF
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Oil pressure switch signal
Channel Probe Terminal No.
1 + E05-19
– L01-14
Measurement condition
•Engine: Running
img
Lighting switch signal (HEAD)
Channel Probe Terminal No.
1 + G04-5
– L01-14
Measurement condition
•Ignition: “ON”
•Lighting switch: other than “HEAD” position
img
Windshield wiper switch (AUTO) signal, rear wiper switch signal, turn signal switch signal, hazard warning switch signal, rear left seat belt buckle switch signal, rear defogger switch signal, FAR/NEAR setting switch signal, RBS OFF switch signal, driver seat belt buckle switch signal and passenger seat belt buckle switch signal
Windshield wiper switch (AUTO) signal
Channel Probe Terminal No.
1 + G04-11
– L01-14
Measurement condition
•Ignition: “ON”
•Windshield wiper switch: Other than AUTO position
Rear wiper switch signal (INT)
Channel Probe Terminal No.
1 + G04-12
– L01-14
Measurement condition
•Ignition: “ON”
•Rear wiper switch: Other than INT position
Turn signal switch signal (L)
Channel Probe Terminal No.
1 + G04-13
– L01-14
Measurement condition
•Ignition: “ON”
•Turn signal switch (L): OFF
Turn signal switch signal (R)
Channel Probe Terminal No.
1 + G04-14
– L01-14
Measurement condition
•Ignition: “ON”
•Turn signal switch (R): OFF
Hazard warning switch signal
Channel Probe Terminal No.
1 + G04-15
– L01-14
Measurement condition
•Hazard warning switch: OFF
Rear left seat belt buckle switch signal
Channel Probe Terminal No.
1 + G04-25
– L01-14
Measurement condition
•Ignition: “ON”
•Rear left seat belt: Fasten
Rear defogger switch signal
Channel Probe Terminal No.
1 + G04-26
– L01-14
Measurement condition
•Ignition: “ON”
•Rear defogger switch: Released
Rear wiper switch signal (ON)
Channel Probe Terminal No.
1 + G04-29
– L01-14
Measurement condition
•Ignition: “ON”
•Rear wiper switch: Other than ON position
FAR/NEAR setting switch signal
Channel Probe Terminal No.
1 + G04-31
– L01-14
Measurement condition
•Ignition: “ON”
•FAR/NEAR setting switch: FAR position
RBS OFF switch signal
Channel Probe Terminal No.
1 + L01-8
– L01-14
Measurement condition
•Ignition: “ON”
•RBS OFF switch: Released
Driver seat belt buckle switch signal
Channel Probe Terminal No.
1 + L01-19
– L01-14
Measurement condition
•Ignition: “ON”
•Driver seat belt: Fasten
Passenger seat belt buckle switch signal
Channel Probe Terminal No.
1 + L01-20
– L01-14
Measurement condition
•Ignition: “ON”
•Passenger seat belt: Fasten
•Passenger seat: Someone sits on passenger seat
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Vehicle speed signal
Channel Probe Terminal No.
1 + G04-32
– L01-14
Measurement condition
•Vehicle speed: 40 km/h (25 mile/h)
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Parking brake switch signal
Channel Probe Terminal No.
1 + L01-21
– L01-14
Measurement condition
•Ignition: “ON”
•Parking brake lever: Released
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