Suzuki Grand Vitara JB416 / JB420 / JB419. Manual - part 529

10B-17 Body Electrical Control System: 

BCM Power Circuit and Ground Circuit Check

S6JB0AA204007

Wiring Diagram

Troubleshooting

7

8

9

10

11

12

13

14

15

6

5

4

3

2

1

G32

24

1

2

3

4

5

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G30

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G31

BLK
BLK

G32-1
G30-12

+B

G32-13

WHT

WHT/BLK G30-2

PPL/RED G30-1

3

2

1

4

I7JB01A20008-01

1. BCM

3. Battery

2. Ignition switch

4. Junction block

Step

Action

Yes

No

1

Fuse check
1) Turn ignition switch to OFF position.
2) Check circuit fuses for condition.

Are circuit fuses in good condition?

Go to Step 2.

Replace fuse and check 
for short circuit to 
ground.

2

Power supply circuit check
1) Disconnect connectors from BCM.
2) Check for proper connection to BCM connector at 

terminal “G32-13”.

3) If OK, then measure voltage between “G32-13” terminal 

of BCM and vehicle body ground.

Is voltage 10 – 14 V?

Go to Step 3.

Repair power supply 
circuit.

3

Power supply circuit check
1) Check for proper connection to BCM connector at 

terminals “G30-1” and “G30-2”.

2) If OK, turn ignition switch ON.
3) Measure voltage between following terminals.

• Between “G30-1” terminal of BCM connector and 

vehicle body ground

• Between “G30-2” terminal of BCM connector and 

vehicle body ground

Is each voltage 10 – 14 V?

Go to Step 4.

Repair power supply 
circuit.

Body Electrical Control System:  10B-18

DTC B1133 (No. 1133): Battery Voltage Too High

S6JB0AA204008

Wiring Diagram
Refer to “BCM Power Circuit and Ground Circuit Check”.

DTC Detecting Condition and Possible Cause

Flow Test Description
Step 1: Check charging system

DTC Troubleshooting

4

Ground circuit check
1) Turn ignition switch to OFF position.
2) Check for proper connection to BCM connector at 

terminals “G30-12” and “G32-1”.

3) If OK, then measure resistance between following 

terminals.
• Between “G30-12” terminal of BCM connector and 

vehicle body ground

• Between “G32-1” terminal of BCM connector and 

vehicle body ground

Is each resistance 2 

Ω

 or less?

BCM power supply 
circuit and ground circuit 
are in good condition.

Repair ground circuit.

Step

Action

Yes

No

DTC detecting condition

Possible cause

Power voltage supplied from battery to BCM is 
higher than 16V.

• Charging system malfunction
• BCM malfunction

Step

Action

Yes

No

1

Charging system operation check
1) Check generator for operation referring to “Generator 

Test (Overcharged Battery Check): For Petrol Engine 
Model in Section 1J” or “Generator Test (Overcharged 
Battery Check): For Diesel Engine Model in Section 1J”.

Is it in good condition?

Substitute a known-
good BCM and recheck.

Repair charging system.

10B-19 Body Electrical Control System: 

DTC B1141 / B1142 (No. 1141 / No. 1142): Outside Air Temperature (Ambient Temp.) Sensor Circuit 
Malfunction

S6JB0AA204009

Wiring Diagram

DTC Detecting Condition and Possible Cause

Flow Test Description
Step 1: Check whether malfunction is in outside air temperature sensor.
Step 2: Check outside air temperature sensor circuit.

DTC Troubleshooting

7

8

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11

12

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6

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3

2

1

G32

24

1

2

3

4

5

6

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12

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14

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19

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23

G30

1

2

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4

5

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40

G31

WHT/BLK

BLK/RED

5V

G31-24

G31-21

1

2

2

3

1

I5JB0AA20007-01

1. Outside air temperature sensor

3. Outside air temperature sensor connector

2. BCM

DTC detecting condition

Possible cause

DTC B1141 (DTC No. 1141):
Input signal from outside air temperature sensor is higher 
than 4.88 V.

• Open in outside air temperature sensor circuit
• Outside air temperature sensor malfunction
• BCM malfunction

DTC B1142 (DTC No. 1142):
Input signal from outside air temperature sensor is lower 
than 0.1 V.

• Short in outside air temperature sensor circuit
• Outside air temperature sensor malfunction
• BCM malfunction

Step

Action

Yes

No

1

Outside air temperature sensor check
1) Turn ignition switch to OFF position.
2) Disconnect connector from outside air temperature 

sensor.

3) Check outside air temperature sensor for resistance 

referring to “Outside Air Temperature Sensor Inspection 
(If Equipped) in Section 9C”.

Is it in good condition?

Go to Step 2.

Replace outside air 
temperature sensor.

Body Electrical Control System:  10B-20

DTC B1150 (No. 1150): Air Bag Communication Circuit Malfunction

S6JB0AA204010

Wiring Diagram

DTC Detecting Condition and Possible Cause

Flow Test Description
Step 1: Check air bag communication circuit.
Step 2: Check air bag communication circuit.

2

Outside air temperature sensor circuit check
1) Disconnect connector from BCM and check for proper 

terminal connection to BCM connector.

2) If connections are OK, check outside air temperature 

sensor circuit for open, short and high resistance.

Is each circuit in good condition?

Substitute a known-
good BCM and recheck.

Repair circuit.

Step

Action

Yes

No

7

8

9

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12

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14

15

6

5

4

3

2

1

G32

24

1

2

3

4

5

6

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11

12

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21

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23

G30

1

2

3

4

5

6

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8

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10

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12

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G31

YEL

5V

G30-19

[A]: G47-22
[B]: G46-15

[A]

[B]

2

1

1

1

G46

G47

I5JB0AA20008-01

[A]: Vehicle not equipped with side-air bag

1. SDM

[B]: Vehicle equipped with side-air bag

2. BCM

DTC detecting condition

Possible cause

After ignition switch is turned on, abnormal signal is fed 
from SDM to BCM.

• Air bag communication circuit open or short
• SDM malfunction
• BCM malfunction